Amateur Radio Archive

Communications Receiver Bargains Radio Amateur 05-1963

Tue, 21 Feb 2012 00:33:47 GMT

BC453B 190-550 kc G-tube superhet w 85 kc tF's. ideal as Jong-wave revr, as tu abfe IF amp . as 2nd convert. W all data, CHECKED ELECTRICALLY 12 95 Grtd. OK M lbs. fob Los Angeles Same, in handsome cabinet w pwr sply, spkr. lt 37 5Q etc., ready to uset is our QX-535, 19 lbs, . . f RBS Navy's pride 2-20 mc 14-tube superhet has voice filter for low noise, ear-saving AG C, high sens, amp select. IF is 1255 kc. Checked, aligned, w pwr sply. cords, tech data, ready to use, fob Charleston, S. C. 559...

May Qex Advertising Index Radio Electronics 1990-05

Mon, 20 Feb 2012 20:58:33 GMT

THE AMERICAN RADIO Hk RELAY LEAGUE, INC W The American Radio Relay League, inc. is a vpy noncommercial association ot radio amateurs, V organized for the promotion of interest in Amateur Rsdio communication and experimentation, for the establishment of networks to provide communications in the event of disasters or other emergencies, 'r.i the advancement ot the radio art and of the public welfare, for he representation of the radio amateur in legislative matters, and for the maintenance of...

PiNetwork and Coil Design Made Easy with the TRS Pocket Computer Radio Electronics 1982-05

Sun, 19 Feb 2012 15:46:03 GMT

Do you shy away from designing resonant rf circuits because of the complexity of the calculations Would you like to extend the range of that faithful old linear amplifier to 160 meters but hate to depend on weeks of cut-and-try to find the proper coil size Have you worn out your handbook by referring to the matching-network tables that never quite fit your application If the answer to any of these questions is yes, read on. Here is a lazy man's approach to designing pi networks and air-eore,...

Principles of Radio Telephony RadioConstruction

Sun, 19 Feb 2012 06:28:43 GMT

Radio telephony may be defined as the transmission to a distance of speech, music and other sounds through space without wire, by means of electro-magnetic waves. In the standard system of radio telephony continuous waves are used of much higher frequency than those of audible sounds. The amplitude of those waves is modulated by the connection of a microphone in the transmitting circuit. Receiving apparatus are similar to those employed in radio telegraphy and are designed so that the head set...

Selected Vector Volt Vintage 1966-05

Fri, 17 Feb 2012 14:52:25 GMT

COMPLEX INSERTION LOSS OR GAIN COMPLEX REFLECTION COEFFICIENT COMPLEX IMPEDANCE OR ADMITTANCE TWO-PORT NETWORK PARAMETERS ANTENNA IMPEDANCE AND PHASE CHARACTERISTICS The arrangement shown in a is limited to the frequency range of the directional couplers usually gt 200 MHz . The cable or line-stretcher may be needed at the higher frequencies to compensate for phase shift in the directional couplers and other circuitry. A simpler arrangement, useful at lower frequencies, is shown in b ....

paper upon which theexactoutlineof the panel or chassis has been RadioConstruction

Tue, 14 Feb 2012 18:38:58 GMT

made. The parts are generally moved around until a satisfactory arrangement has been obtained. The centers and sizeof the various holes are then laid out on the paper, after which the SCRATCH ON METAL TO FACILITATE BENDING One Side Only FIG. 2 After corners has been removed and the drilling and cutting completed, the projecting sides of the metal is bent down 90 to form the chassis as shown in fig. 4. paper is transferred to the panel and properly fastened by gummed paper or adhesive tape. Only...

The Miner Superdyne Circuit Two Stage Amplifier

Mon, 13 Feb 2012 18:09:25 GMT

This is one of the very recent circuits which have appeared and we have found it the most successful of the many attempts to combine the advantages of regeneration and radio-frequency amplification. While we would not recommend that it be attempted by one who is building his first set, still it is not beyond the ability of anyone with a little experience in radio construction. This circuit differs from the usual radio-frequency circuit in the use of the tickler coil. It Is found In all tuned...

The Use of the HP Microwave Design System in the WBand Tripler Design Vintage 1991-04

Sun, 12 Feb 2012 21:05:51 GMT

To achieve the maximum conversion efficiency of the tripler described in I he accompanying article, it was necessary to provide a very good match to the diode at the tripler input frequencies 25 GHz to 36.66 GHz . An impedance matching filter was designed using the Microwave Nonlinear Simulator MNS which is a part of Hewlett-Packard's Microwave Design System MDS . The design of the filter took place in three stages Developing and simulating a model of the nonlinear device used for...

Qex 1 Radio Electronics 1990-10

Sun, 12 Feb 2012 19:53:26 GMT

heat sink which greatly reduced the case temperatures thereof. In addition, I heat sinked the driver transistor, Q404, to cool it down. Stability of the VFO was greatly improved by soldering one end of a short piece of wire I used a thin braided wire like Soder-wick to the frame of the variable capacitor C1 and the other end to the VFO shield. This was suggested in Refs 1 and 3 and it went a long way in making the HW-9 easy to tune especially when using the narrow filter. One very annoying...

Info Ifd Radio Electronics 1991-04

Thu, 09 Feb 2012 17:01:46 GMT

WA8DRZ 6 WDRZ Redwood City San Francisco CA 94062 USA 10140.5 10141.5 14068.5 14069.5 14070.5 14071.5 14072.5 14073.5 14074.5 14075.5 WB7QWG 9 WQWG Indianapolis IN 46236 USA 7072.5 7075.5 14071.5 14073.5 21071.5 28075.5 WB8APD WAPD Willoughby Cleveland OH 44094 USA 14071.5 Send corrections to Paul Newland, AD7I, PO Box 205, Holmdel, NJ 07733. Email addresses are APLink AD71 AT KB1PJ packet radio ad7i KD6TH. NNJ.NJ.USA.NA Internet ad7i hocpa att.com TELEX TRT 15-722-4370 AAB PNEWLAND AT amp T...

Nkk Talks About Future Pacsat Pbbs Operations Radio Electronics 1990-10

Sun, 05 Feb 2012 19:43:37 GMT

AMSAT-NA Area Coordinator Jim White, WD0E, has asked some questions of interest to OSCAR satellite users about the PACSATs and AMSAT. Software engineer, Harold Price, NK6K, has responded with the following answers. WD0E Which PACSAT will commence PBBS operations first NK6K UO-14 is now about 80 functional with the PBBS software. AO-16 will be brought to that level, then LO-19. WD0E Will the TLM or Whole Orbit Data WOD format, frequency or any other parameters change NK6K This is more of a...

c o m m unica t ion circui t s Radio Experimenter 1929

Tue, 31 Jan 2012 18:56:51 GMT

Determining the transmission characteristics of communications apparatus is, like all other problems in measurement, nothing more than the judicious application of certain standardized definitions. A possible difference may be claimed in the fact that these quantities are defined, for convenience, as the logarithm of a ratio where almost every one else would be content to talk about the simple arithmetical ratio. But to claim special privilege on that score would be a most puerile form of...

Electrical Data Vintage 1955-02

Sun, 29 Jan 2012 04:03:23 GMT

The new decades require an 80-volt negative-going pulse of 1 microsecond maximum rise time for driving purposes, somewhat lower than the driving voltage of previous units because of reduced stray capacities in the new layout. If faster rise time is available, somewhat less amplitude can be vised since the driving pulse is applied to a differentiating network of approximately 100 rami in series with 15,000 ohms. Each decade provides an 80-volt negative-going output step for driving another...

Networking Conference Proceedings Available Radio Electronics 1990-10

Sun, 22 Jan 2012 16:31:44 GMT

The ARRL CRRL Computer Networking Conference was held in London, Ontario, Canada on September 22. The proceedings of this ninth edition of the conference are available now from ARRL HQ for 12.00 plus 2.50 3.50 UPS for shipping and handling. The papers contained in this year's edition are 9600 Baud Operation by Phil Anderson, W0XI, and Karl Medcalf, WK5M Digital Regenerator Modification for the TNC-2A by William A. Beech, NJ7P, and Jack Taylor, N700 Considering Next-Generation Amateur Voice...

GHz Synthesizer Tests Frequency Converter Heads Vintage 1980-04

Wed, 18 Jan 2012 14:44:54 GMT

APG-3.5connector, which is mode-free to 34 Gf lz,' is used up to 4U GHz in the 5356C. The effect of this connector's moiling between 34 and 4 j CHz is taken into account by reducing the specified sensitivity by 5 dB in this region, A special collar was designed for the APC-3.fi connector to strengthen it and to protect it from damage. Waveguide connector WR-28 is also offered, ior customers using only R-band 26.5 to 40 GHz . To test the accuracy of the 5356 5355 system in CW and pulse modes, a...

Cathodefollower Rf Power Amplifier RadioHandbook

Sun, 15 Jan 2012 22:29:32 GMT

Showing the relationships between the tube potentials and currents and the input and output power of the stage. The approximate grid impedance also is given. The design of such an amplifier stage is essentially the same as the design of a grounded-grid amplifier stage as far as the first step is concerned. Then, for the second step the operating conditions given in figure 10 are applied to the data obtained in the first step. As an example, take the 304TL stage previously described. The total...

A HighSpeed Microwave Pulse Modulator Vintage 1991-04

Fri, 06 Jan 2012 06:13:26 GMT

This optional fast pulse modulator uses an unequally spaced diode topology to achieve a wide bandwidth and a high on-off ratio without resorting to performance-limiting diode saturation. FAST PULSE MODULATION, Option 006 for the HP 8360 synthesized sweep oscillators, offers improved pulse modulation performance over the standard instrument block diagram. In this configuration, the instrument has an additional pulse modulator at the output of the RF deck. Pulse modulating after the YIG...

Arrl Publications Radio Electronics 1992-06

Wed, 04 Jan 2012 19:54:35 GMT

1.8-54 MHz Skywave Propagation Software - Version 4 State-of-the-Art Forecasting for Amateur, Professional amp Military Users MENU DRIVEN Easy-to-use interface for Solar Flux, Sun Spot Number, TX Power, TX RX Antennas, min. SNR, Local Noise, Bandwidth, Short Long Path, Frequencies TABULAR SUMMARY Slonal-to-Noise Ratio, RX Power amp Microvolts, S N and Path Availabilities, Total Link Reliability, E F or Mixed Modes, Ant Gain Take-off Angle IONGRAM CHIRP PLOTS Selection of 0-30 MHz or 0-60 MHz...

Radio Batteries RadioConstruction

Wed, 28 Dec 2011 00:39:43 GMT

There may be confusion in the minds of some as to batteries so a classification of types and functions will be helpful, particularly to the novice. Radio batteries may be classified according to the three elements of the vacuum tube which they serve, as A battery B battery C battery The three elements of the common vacuum tube, filament, plate and'grid are often designated by the letters A,.B and C. The order in which the letters are assigned corresponds to the historical development of the...

Vacuum Tubes RadioConstruction

Fri, 23 Dec 2011 10:30:39 GMT

Vacuum Tubes. A vacuum radio tube in its simplest form is somewhat similar to an electric light bulb, but contains a number of metallic elements for various purposes for use in conjunction with radio transmission and reception. The parts of a typical vacuum tube is shown below. Fig. 1. Parts and assembly of a typical glass radio tube. The filament, grid screen and plate are sealed in the tube, from which the air has been removed. Courtesy R.C.A. Mfg. Co. ' Fig. 1. Parts and assembly of a...

Amateur Television Radio Electronics 1990-06

Thu, 22 Dec 2011 16:34:40 GMT

Sensitive GaAsfet converter tunes 420-450 MHz with 25 dB gain Two frequency gt 1 watt p.e.p. transmitter properly matches linear amps with adjustable internal sync stretcher amp blanking level set Full 25 kHz dev. broadcast standard 4.5 MHz sound subcarrier 10 pin VHS color camera and RCA phono jack camcorder or VCR inputs, type N antenna input, and F TV output connectors Transmit video monitor outputs to camera and phono jack Small attractive shielded cabinet - 7 x 7 x 2.5, 11b 10oz. Just...

Taper reamer in for brace RadioConstruction

Mon, 19 Dec 2011 14:13:43 GMT

1 Taper reamer in. for brace. 1 Center punch. 1 Electric soldering iron 100 watts, small pointed tip . 1 Heavy knife 1 Circle cutter adjustable for brace. 1 Screw driver bit for brace. 1 Countersink for brace. 1 Carpenter's ratchet brace. . 1 1 Hand drill 2 speed . 1 Yardstick or other straight edge. x 1 Carpenter's plane 8 to 12 in. . 1 Combination square 12 in. . 1 Pr. wing dividers 8 in. . 1 Long shank screw driver with screw holding clip i i' n. , blade . 1 Screw driver 6 in. to 7 in. M in....

Selectronics Radio Amateur 05-1971

Sun, 11 Dec 2011 22:15:09 GMT

OS-11 Scope Full 1 Meg 3 Tube For 19 Rack Mount Regular amp triggered Sweep. Price 34.95 TS-323 UR Freq Meter Controlled heterodyne-type Inst. Freq Range 20-450 MC. Price 74.95 Xcellent Cond W Bogk TS-155C Sig Generator Freq Range 2700-3400 MC Units in good condition. Sold for Parts 14.95 115V - 50-1600 eye 1 phase P S included in Gen. R509-ARC Receivers Freq Range 118-143 MC with squelch. New 14.95 T-19 ARC Xmitters 3 4 MC Freq Range. 1 MC-Xtals precision type for octal sockets. Panel Meter 0...

Amateur Television Radio Electronics 1990-10

Sat, 10 Dec 2011 22:49:34 GMT

Modular Microwave Breadboard Svstem Vintage 1991-04

Thu, 08 Dec 2011 15:13:53 GMT

One potential disadvantage of the drop-in assembly methods used for the modspiitter and tow-band microcircuits is that there s no easy way to test the individual circuits within these hybrids With the former design method of placing each circuit in its own package, this was not a problem ir- the new desigr however the circuits are hioden away inside a final large package and it may not even be possible to gain access to both ports of all of the circuits A new technique was needed to test the...

Info Nck Radio Electronics 1990-10

Wed, 07 Dec 2011 19:21:20 GMT

Gulf Coast Packet Assoc. Mobile. 205-476-4100 Arizona Ham Radio Outlet Phoenix, 602-242-3515 Ham Radio Outlet Anaheim, 800-854-6046 Anaheim, 714-761-3033 Ham Radio Outlet Burlingame, 415-342-5757 Ham Radio Outlet Oakland, 415-534-5757 Ham Radio Outlet San Diego, 619-560-4900 Ham Radio Outlet Van Nuys, 818-988-2212 The Radio Place Sacramento, 916-441-7388 Delaware Delaware Amateur Supply New Castle, 800-441-7008 Amateur Electronics Supply Clearwater, 813-461-4267 Amateur Electronic Supply...

First Choice Among The Nation S Am A Teurs Radio Amateur 09-1961

Wed, 07 Dec 2011 01:14:21 GMT

E. F. JOHNSON COMPANY WASECA, MINNESOTA 1379 East 15th Street C nntonfc V lume Number 12 Silicon Rectifiers Cnm WI0OP 6 How not to pop 'em, a lesson for haras and engineers alike, Tuning Bypass Condensers j m Kyle K5JKX 6 8 How to make a bypass bypass at the VHF's. Simplescope p erQQ W0QPA 10 Perchance the titie may give this one away. You need one. Build it VFO Chirp VS 6AU6 Al Brogdon K3KMO 20 Several VFO's use a 6AU6. Lousy choice, try a 6AH6 instead and see. Conso,e Dassow W9H KA 22 If...

Measurement Tools Vintage 1987-01

Tue, 06 Dec 2011 02:54:36 GMT

Compute systems are extremely complex, requiring comprehension at many evels Measurements, too. must be made at different levels to provide a complete system charaderizaticr For a particular metric, it is important to choose the best tool The tools can be compared ,n terms of what they can measure their ease of use, the overhead they incur and their sampling frequencies Table t compares the tools for each category Hardware measurement tools analyze signals trom tne machine under test Most...

by Thomas A Hender Vintage 1975-11

Tue, 06 Dec 2011 02:42:08 GMT

Objective design a shirt-pocket calculator package for minimum factory cost, with reliability equal to or better than that of the HP-35 family. HP quality standards must be maintained. Shirt-pocket size was achieved by reducing the number of keys from 35 to 30 one less horizontal row and by spacing the keys closer together. Spacing is the minimum deemed comfortable for the majority of users. Also, the display was reduced from 15 to 12 digits, and decimal points share positions with their...

The Use of HP ME in the WBand Tripler Design Vintage 1991-04

Fri, 02 Dec 2011 08:57:08 GMT

The use o' drafting tables oencils and paper for design and drafting at HP is rapidly disappearing and being replaced by computers, displays, and keyboards The primary mechanical design software is HP ME 10 for two-dimensional work and HP ME 30 for solids modeling The package for the W-band tripler microcircuit described in the accompanying article was designed using ME 10 The required views were constructed with exact geometry so that other areas involved in documentation and manufacturing...

HP MAP File Transfer Access and Management Vintage 1990-08

Tue, 29 Nov 2011 19:36:58 GMT

File Transfer, Access, and Management, or FT AM, is an OSI Standard that defines the framework upon which layer seven file transfer services can be built for accessing and managing files across open systems. THE BASIC DISTRIBUTED file system capability for OSI communication is defined by the file service standard called File Transfer, Access, and Maoage-menl FTAM FTAM defines facilities for Ihe transfer of files between open systems and provides a framework for accessing and managing files...

Down East Microwave Radio Electronics 1990-10

Thu, 24 Nov 2011 03:39:48 GMT

Amateur Microwave Antennas and Equipment beam scatter redirection. One particularly interesting method of beam blockage is by use of a mirror cemented to the cone of a speaker the angle of beam reflection varies with the speaker drive both amplitude and frequency . Another interesting shutter is a chopping wheel a circular fan blade with periodic apertures, which can chop the beam into pulses. In fact, this method is the most used as the chopped beam can convey intelligence by small changes in...

Surplus Specials Radio Amateur 05-1963

Thu, 24 Nov 2011 01:03:01 GMT

Monitor sub-unit for freq-shift converter CV-89A U RA-8A. with 2BPI CRT, 1Z2, 12AX7, 5 controls, tube shield, etc. 4JV x 5 x 12. Shpg. Wt. 7 ibs. Schematic incl. . 56.95 Monitor sub-unit for freq-shift converter CV-89A U RA-8A. with 2BPI CRT, 1Z2, 12AX7, 5 controls, tube shield, etc. 4JV x 5 x 12. Shpg. Wt. 7 ibs. Schematic incl. . 56.95 Pi-network Loading Capacitor, 5 sections, each 20-400 mmf, 2000m mf total. 3s shaft. 4 ibs. 2.00 Power Transformer 350-0-350 v. 135 ma de, 5v 3A, 6.3v 3 6A. 3...

Analyzer Synthesizes Frequency Response of Linear Systems Vintage 1987-01

Tue, 22 Nov 2011 18:57:20 GMT

A COMPLETE CAPABILITY for synthesizing the frequency response of linear systems based on their pole-zero, pole-residue, or polynomial model is included in the HP 3562A Signal Analyzer. This synthesis capability includes table conversion, the ability to convert automatically between the three models. The frequency responses can be frequency scaled and system lime delays can be added. The designed system frequency responses are synthesized with exactly the same frequency points as those used by...

Lafayette He B Deluxe Meter Transceiver Radio Amateur 05-1963

Sat, 19 Nov 2011 23:20:27 GMT

High Efficiency Up To 100 Modulation New Modulation and Power Transformers plus 7BG8 Power Pentode New Heavy-Duty Communications Vibrator Front Pane Antenna Loading Controls New Standby Switch VFO Power Jack Sensitive Superheterodyne Receiver Built-in 117 VAC and 12 VDC Power Supplies Rugged Push to laik Ceramic Microphone LAFAYETTE HE-50A 10 METER TRANSCEIVER Simitar to above except for 10-meter operation 89.95 THE LAFAYETTE HE-30 Professional Quality Communications Receiver Tunes 550 KCS to...

The phase inverter Amplifier Builders Guide

Wed, 16 Nov 2011 21:40:33 GMT

The phase inverter used is of the type in which the out-of-phase voltage is obtained from the cathode circuit. Actually, the 25,000-ohm resistor at the ground end of the 6J5 cathode is really part of the plate circuit. Where additional amplifier gain is not needed, this form of phase inverter is preferable from the standpoint of simplicity to the double-triode type, and was used for this reason. Notice the 250,000-ohm resistors connected from the plates of the 6L6-G tubes to the plates of the...

Ba A Aa Vintage 1981-12

Wed, 16 Nov 2011 19:29:45 GMT

Aug. Dec. Dec. Dec. Aug. Sept. June My Very-large-scale integrated circuit design University research, industry support June 1981 Verification, design and artwork, VLSI June 1981 Verification, design and artwork, VLSI Adams, Charles A. Ainsworth, Gerald L. Apte, Ravi M. Aue, Peter Ha ley, Pau W. Baker, Thomas H. Baron, Wayne D. Bartlett, Debra S. Black. Kyle M. Borowski, Donald T. Bracken, Diane F. Bray, Robert C, Brooksby, Merrill W, Federman, Nancy C. Flower, Terry L. Frankel, Andrea K,...

notes on power Measurement in communication Circuits Radio Experimenter 1929

Wed, 16 Nov 2011 13:55:07 GMT

ANOTHER communication meas-j urement problem makes its appearance when it is desired to determine experimentally how much power a given power source is capable of delivering to a specified load or sink. So long as the source itself is available for test, it is merely necessary to set up the equipment and make the measurements. If, however, the source is not available, some means must be found of simulating it. At least two methods for doing the job are available, and we propose to describe...

Transmitter Series 1 Radio Amateur 05-1963

Tue, 15 Nov 2011 02:59:41 GMT

TMC Models SBT-1K series of transmitters provide conservatively rated 1 kw PEP output in SSB modes, with Signal to Distortion ratio of 40db, and 1 kw average power in conventional communication modes within the frequency range of 2 to 32 Mcs, Stabilities of 1 port in 10 to synthesized accuracy of I part in 108, with 100 cps incremental tuning, are featured in this series of transmitters. The TMC SBT-1K series of transmitters are attractively housed in semi-pressurized cabinets with many...

A new harmonic heterodyne frequency converter plugin adds automatic GHz frequency measurements to the universal capabilities of HPs top counter Vintage 1980-04

Sun, 13 Nov 2011 04:47:53 GMT

by Richard F. Schneider, Ronald E. Felsenstein, and Robert W. Offermann O BE USEFUL in the widest possible range of applications. a microwave counter should be capable of measuring the carrier frequencies of pulsed or CW signals, and for pulsed signals, should also provide for liine interval or frequency measurement of the pulse modulation. The design should be optimized with wide IF band-widths for narrow pulses and wide KM deviations, and should have high sensitivity. Cost-effective frequency...

Hewlettpackard Journal Vintage 1981-12

Fri, 11 Nov 2011 18:54:02 GMT

Technical In formation from the Laboratories of Hewlett-Packard Company x 4 DECEMBER 1981 Volume 32 Number 12 Surface-Acoustic-Wave Delay Lines and Transversal Filters, by Waguih S. Ishak. H. Edward Karrer, and William R. Shreve Generating and detecting minute ripples on the surface of a solid provides a way fo delay and or filter electronic signals in a small space. Surface-Acoustic-Wave Resonators, by Peter S. Cross and Scott S. Elliott By reflecting acoustic waves back and forth on the...

SurfaceAcousticWave Delay Lines and Transversal Filters Vintage 1981-12

Fri, 11 Nov 2011 18:53:13 GMT

Novel, simple and compact electronic devices can be realized by exciting and detecting acoustic waves electrically on the surface of a solid. Technological advances in low-loss delay lines and bandpass filters are discussed. by Waguih S. fshak, H. Edward Karrer and William R. Shreve SURFACE WAVES are familiar to anyone who has thrown a pebble into a pond and watched the concentric ripples emanate from the splash. These waves carry energy outward from 1 lie splash at a velocity dependent on the...

How and Why the Talkies Radio Experimenter 1929

Fri, 11 Nov 2011 18:51:37 GMT

By HORATIO W. LAMSON, Engineering Department In the December issue of the EX-I'EHIMENTER we outlined the general problems of the talking movies and discussed in some detail the wax disc method of recording and reproducing synchronized sound. We now propose to consider the optical method whereby a photographic record, corresponding to the fluctuating sound impulses, is obtained upon a film in the studio and subsequently reproduced as sound in the theater. There are two fundamental forms which...

V Oen Radio Amateur 06-1966

Tue, 08 Nov 2011 04:43:49 GMT

In tlie last episode my first DXpedition had come to an end, I think I had learned a lot oir that trip. I found that I did not mind traveling and really wanted more of it, in fact lots more of t. t had final got to the point where I did not mind in the least getting tangled up with the customs in the different countries, I had found that I could eat anything that anyone else could with no bad effects. I found that I was not effected with sea sickness at all. Many more things were learned too,...

P T I 1 Radio Amateur 10-1980

Tue, 27 Sep 2011 09:31:35 GMT

The sketch of the loop filter Fig. 9 shows that a value is to be found for C plus R1 and R2. The first thing I did was to determ ine the co of the loop in rad sec. First of all, it is necessary to consult a table of the second order loop step response. Knowing that the desired damping is 0.707, the time for the peak overshoot to settle out to 5 of its final value is at con t is equal to 4.5. The value for t is .5 seconds or the desired lock time. To determine the con of the loop, the formula is...

LowCost Servo Design Vintage 1988-08

Tue, 27 Sep 2011 09:27:30 GMT

As a raster output device the PaintJet printer differs from its plotter predecessors In a number of ways One unusual feature is the optical encoder on the carnage axis. This linear, singlechannel encoder provides carriage position data that is used both to control the Firing of drops from the Inkjet print cartridges and as feedback for the servo controlling the carriage motion. Its design meets objectives o high accuracy and low cost, but introduced problems for servo design and development The...

Impedance Bridge Radio Amateur 09-1962

Tue, 27 Sep 2011 09:23:11 GMT

Here is a complete set of full scale drawings of the parts for the Impedance Bridge which was featured in the August 1965 issue of 73. This bridge is one of the most useful pieces of test equipment that you could possibly build. It would cost you hundreds of dollars to buy this unit commercially made. This set of plans comes complete with a reprint of the original article, There have been many requests for a giant sized schematic of the wonderful little transceiver that appeared in the November...

Balanced Load Measurements with VHF Bridge Vintage 1950-12

Tue, 27 Sep 2011 08:28:19 GMT

THE -hp- Model 803A VHF Bridge, described in the April, 1950 issue of the Hewlett-Packard Journal, has made possible the direct measurement of impedance up into the I-HI' region. This bridge measures the impedance magnitude and phase angle of most types of high-frequency devices over a range from below 50 to above 500 mc. One type of impedance measurement sometimes desired is the meas urement of balanced impedances such as balanced antennas fed by balanced transmission lines. Since the...

QEX Flc Radio Electronics 1996-11

Tue, 27 Sep 2011 08:22:42 GMT

Attenuators are fairly frequent hamfest finds, but ones that themselves have good VSWR to 10 GHz are less common, and it's hard to tell how good they are without test equipment. An alternative might be to build an attenuator from small chip resistors. I used my PAD.EXE program to review possible resistor values, and found that I could make a 15.3-dB n attenuator using only 140-ft resistors if the shunt lugs were formed by two resistors in parallel, a good idea to reduce stray inductance.13 I...

Helical Resonator Preamps Radio Amateur 06-1989

Tue, 27 Sep 2011 07:57:48 GMT

COR-3 REPEATER CONTROLLER kit. Features adjustable tail amp time-out timers, sol Ed-state relay, courtesy beep, and local speaker am plifi er 49 CWID kit. Diode programmed, adjustable tone, speed, and timer, to go with COR 3 59 NEW CQR-4 kit. Complete COR and CWID all on one board for easy construction, CMOS logic for low power consumption. Many new features. EPROM programmed specify call letters,. 99 NEW TD-3 5UBAUDIBLE TONE DECODER ENCODER kit. 24 TD-2 DTMF DECODER CONTROLLER kit. Full 16...

A Computer Radio Amateur 05-1976

Tue, 27 Sep 2011 07:43:02 GMT

Get optimum performance band for band Choose from medium or high power resonators tor your favorite bands. Fotd over. 360 swivel mast for quick band change or easy garaging Select from two versions, tender deck or bumper mount location Stainless steel ball mount, 180s adjustable, commercial duty for superior mechanical and electrical performance Get exceptional reports, broadest bandwidth, lowest SWR Use with any convenient length 50 ohm coax Matching devices not required For convenience use...

Simulated Surveillance Video Systems Radio Amateur 05-1980

Tue, 27 Sep 2011 07:42:27 GMT

Since the video camera systems are totally psychologic -nar s the vrsibMit gt and suggestion of vttieo cameras is what deters the thief s des e to steat. all that is realty needed s a device mat appears to be a functioning video camera The SSV System provides ihe businessman with ihe same deter rent to crime as reaJ systems at a traction of Ihe cost, because the Cameras and alarm boxes are em T gt .' e.tromcs -ui t r crook ton'i kno this and SSV Systems are r- tie mei gt realistic in detail....

Horizontal Amplifier Vintage 1956-04

Tue, 27 Sep 2011 07:34:06 GMT

The pass band of the horizontal amplifier is rated as being from d-c to more than 500 kc 3 db point . The basic sensitivity of the amplifier is 0.2 volts cm. Lesser sensitivities are obtained by a calibrated attenuator-gain changing arrangement which reduces the sensitivity in four steps to 5 volts cm. A 3 1 vernier permits the sensitivity to be varied continuously and also extends the Fig. 12. Calibrator voltage selector anil terminal. Fig. 12. Calibrator voltage selector anil terminal. The...

by Brian J Frohring Bruce E Peetz Mark A Unkrich and Steven C Bird Vintage 1988-02

Tue, 27 Sep 2011 07:30:20 GMT

IN THE PAST. fast, wideband waveform recorders have not kept pace with their lower-speed cousins in measurement fidelity. Therefore, the primary design objective of the HP 5185A Waveform Recorder was superior dynamic performance, requiring careful design of all subsystems affecting measurement performance. This article describes the key considerations involved in the design of the major analog components. We also discuss the most useful parameter for verifying dynamic performance, effective...

More MHz Auroral E Radio Electronics 1990-05

Tue, 27 Sep 2011 06:38:06 GMT

By Emil Pocock, W3EP RR 3 Box 70 Rte 207 Lebanon, CT 06249 Since the announcement in December 1989 OST of the first-ever reported incidence of widespread auroral-E propagation on 144 MHz, which occurred earlier in the year on March 13-14, a second notable 144-MHz auroral-E event has been reported. This session took place during the early hours of August 15, 1989, along the Canadian-US border west of the Great Lakes. At least 25 contacts were known to have been made between 0615 and 0725 UTC,...

R Swm Principles Of Electron Tubes

Tue, 27 Sep 2011 06:16:51 GMT

Rack, A. J., 178 Ramo, S., 177 Redl, A., 113 Reich, H. J., 155, 156, 157, 178, 218, 235, 243, 259, 363, 368 Reid, D. G., 177 Reimann, A. L., 47 Rhoad, E. J., 176 Richards, L. A., 156 Richards, P. A., 369 Richardson, 0. W 21, 23, 46 Richter, W., 89, 353 Rider, J. F., 364 Righi, A., 243 Risch, R 258 Ritchie, D., 334 Rivlin, R. S 178 Roberts, F., 195 Roder, H., 190, 199, 202, 204, 207, 210, 212, 213 Romain, B. P., 335 Rsehewkin, S., 224 Ruiz, J. J., 364 Runge, I., 275 Ruska, E., 27

Microlog 1 Radio Amateur 07-1981

Tue, 27 Sep 2011 06:04:18 GMT

Ever been curious about that NCC15 15-meter SSB CW QRP transceiver that's been advertised in 73 lately I have. In fact, I've been seeing tantalizing ads for it since 1978 in CQ HAM RADIO, Japan's premier ham radio magazine. When the rig finally appeared on Columbia's shore, I knew I had to have one. At 235, it seemed almost impossible to go wrong, so t promptly fired off an order. By the time the rig arrived, I was more than a little curious and excited. Careful unpacking yielded the rig...

Vine Street Dept Radio Amateur 06-1966

Tue, 27 Sep 2011 05:59:14 GMT

MILITARY SURPLUS ELECTRONIC EQUIPMENT ARC-27, ARC-34, ARC-38, ARC-44, ARC-52, ARC-55, ARC-57, ARC-66, ARC-70, ARC-73, ARC-84, ARN-14, ARN-18, RT-220C ARN-21, ARN-59, APN-22, APN-70, APR-13, APR-14, ARR-41, COLLINS 51X-2 RECEIVER, 17L-7 TRANSMITTER, 51V-3, 51Y-3, 618S-1. RECEIVERS R-388, R-390, R-390A, R-391, 51J-4, RT-66 THRU RT-70 GRC, R-108 GRC, R-109 GRC, AM-65, RT-77 GRC-9, GRC-10, GRC-19, PRC 10A, PRC-25, TRC-1, TRC-7, TRC-24, AN TCC-7, GMD-1. TEST EQUIPMENT WITH ARM, SG, PRM, URM, UPM,...

Health Radio Amateur 05-1971

Tue, 27 Sep 2011 05:37:07 GMT

Fig. 1 Tubing may have balls or disks on their ends or strips may overlap for slight fixed condenser effect. Connect the high voltage either to A and B or to A and C. Practically there is no difference. If there is one thing we readers of 73 have even more in common than our interest in radio I would guess it would be our health in general, though we usually do little about it, and in particular the desire not to die after great pain from cancer. There is something we are qualified to do about...

Sdpgoo Radio Amateur 01-1995

Tue, 27 Sep 2011 05:21:22 GMT

i-Com Transceiver Control Computer Interface 793 CANNING PARKWAY VfCTOR NY 145 4 hsJpgi ORDERS CALL ,rilM 1-800-446-2295 TECH ORDER 1NFO 716 924-4560 FAX 716 924-4555 TERMS StLlsfaell ft guarpht ed EiJimpni ti gt r t0 dnys- If HO Kloaspd relu m m original form for refund. Add S4.95 for shipping, andiron and insurinec For foreign orders acte 2V- 'of surfaco mm COD U.S. only add 5.00. Order under S 20 add 3.00 NY resident add 7N safes uli. SOday parts warranty on l t parts 1-Y amp af port g A...

the measurement and analysis of linear and torsional vibrations with electronic instruments Radio Experimenter 1942

Tue, 27 Sep 2011 05:02:28 GMT

Power Meter 6 Rubber-Covered Cables 8 me n t for the study of vibrational phenomena. The study of the theoretical as well as the practical aspects of vibrations in mechanical systems has been greatly stimulated by the current emphasis on the mechanical side of warfare. The development of fast fighting planes, long-range bombers, high-speed torpedo boats, and armored vehicles depends, in no small measure, on the ability to measure and to control vibrations in the machinery and struc- Figur e 1....

Simple Amiga Terminal Program Radio Amateur 03-1988

Tue, 27 Sep 2011 04:29:32 GMT

OPEN COM1 300.N.8.1 AS t WHILE 1 WHILE LOC lt 1 gt 0 PRINT INPUTS 1,1 WIDTH 77 IF IS gt kH THEN PRINT 1 J WEND Gia it 3 day flea market Exhibits License exams Free bus service CW proficiency test Door prizes VMS video presentation about the HAMVEFTTIOM is available for loan, Contact Dick Miller, 2853 Cresta, Beavercreek, OH 45324 Flea market tickets and grand banquet tickets are limited. Place your reservations early, please, A maximum of 3 spaces per person non-transferable , iickets valid all...

Palomar Tuner Tuner Radio Amateur 11-1986

Tue, 27 Sep 2011 04:10:51 GMT

Palomar Engineers have announced their new Tuner Tuner111, which connects between The Barkers Williamson PT-2500A linear amplifier. your transceiver and your antenna matching unit With Ihe Tuner Tuner you can adjust your AMU without putting a signal on the air. The built-m 50-0hm noise bridge gives an audible null when the tuner matches the coax line to t 1 swr For more information, please check Reader Service number 273. Pac-Comrn is manufacturing packet repeater controllers designed expressly...

Hal Communications Corp Radio Amateur 04-1979

Tue, 27 Sep 2011 04:08:49 GMT

In Europe contact Richter amp Co. Hannover I,EC, Interelco Bissone Calf or write for complete new catalog record The single iiem to draw the most response which 1 have ever mentioned in the two years of this column was the question as to the whereabouts of the Green Keys and RTTY Journal. While no one seems to know what happened to the Green Keys, oh, boy, do you all know about the RTTY Journal, I received numerous notices that it is not dead, although the exact state of its health was...

Threeelectrode Tube Or Triode Thermionic Vacuum Tubes

Tue, 27 Sep 2011 03:36:31 GMT

Previous to the year 1907, practically the only use to which the two-electrode tube was put was the rectification of alternating currents, either for power purposes or as a Fleming valve detector in the reception of radio messages. These applications will be described in later chapters. Lee de Forest1 in 1907 made a most important and valuable improvement in the vacuum tube, which very much expanded its field of usefulness. His invention consisted in the addition of a third electrode adapted to...

Tioga County Pa Aug Radio Amateur 07-1981

Tue, 27 Sep 2011 03:29:06 GMT

The Tioga County Amateur Radio Club will hold its 5th annual hamfest on Saturday, August 29.1981, f rom 8 00 am to 4 00 pm, at the Tioga County Fairgrounds just off Rte, 6, between Wellsboro and Manslteld PA. There will be a free outdoor flea market and inside space will be availabie. Registration is 3.00. Features will include prizes, demonstrations, and food, Pennsylvania's Grand Canyon is nearby. Talk in on 146.19 79 and ,52, For more information, write PO Box 56, Mansfield PA 16933,

Meters Radio Amateur 07-1961

Tue, 27 Sep 2011 03:08:36 GMT

W8HJY points out the secret of EBCO's astounding success 200 to 300 miles ground wave on 6 meters with Gonset Communicator MO Bl LEI AMAZING low-angle, high-gain pe rfo rmance. Puts tho signal rig t where you want it, with plenty of Sock ,1NO COMPARISON reported again and again. W8HJY points out the secret of EBCO's astounding success EBCO ASTOUNDS THE EXPERTS works out of mounts valleys v. her others ccu c net be n-ir rd Monon-gahela and Susquehana Valley VHP Trials, EBCO OUTPERFORMS THEM ALL...

Home Study Radio Amateur 06-1983

Tue, 27 Sep 2011 02:49:23 GMT

No commuting to class. Study aT your own pace, while continuing your present lob, Learn from easy-to-ttrider stand lessons, with help from your home-study instructors whenever you need it. In he Grantham electronics program, you first earn your A.S.E.T. degree, and then your B.S.E.T. These degrees are accredited by the Accrediting Commission of the National Home Study Council, Our free bulletin gives full details of the home-study program, the degrees awarded, and the requirements tor each...

Pl Ast Ic Plumbing Pipe Radio Amateur 10-1982

Tue, 27 Sep 2011 02:47:18 GMT

fyg. 3 al The overall construction of thelO-meter main support is shown. 7he tubing is slit and clamped together with hose clamps, Overall height assuming the base is 2 feet above ground level, is just over 33 feet nety was constructed and tested at W1GV 4 and was found to perform exceptionally welt. How does an antenna such as that shown in b , Ftg 1, work Actually, it can he thought of as simply a ground-plane antenna in which the set ot iradials is brought straight down from the feedpoint....

Rf Oui Radio Amateur 06-1995

Tue, 27 Sep 2011 02:36:43 GMT

RF app ie to Port 1 rotates wilh arrow to Pan 3 with V try Hille loss Circulator showing RF ima n fee low loss from Port JM to Pod wrtti reium reflection due to SWR ratio , Back teed from antenna jr o Port a3 srrd Dialed o For -2 5 absorfceti isapated tn tenrinat on of Port -2 preventing retiecSrlg amp ry power to Port 1. Circulator showing RF ima n fee low loss from Port JM to Pod wrtti reium reflection due to SWR ratio , Back teed from antenna jr o Port a3 srrd Dialed o For -2 5 absorfceti...

Catalog Radio Amateur 06-1995

Tue, 27 Sep 2011 02:07:10 GMT

Outside the u s A send S2 00 postage ALL ELECTRONICS CORPORATION P.O. Box 567 Van Nuys. CA 91408 FAX 818 781-2653 Carote Perry WB2MGP Media Mentors inc. Staten island NY 10313-0006 Most amateur radio operators recognize the relationship between speaking around the wohd and sharpening one's geography skills Teachers who use amateur radio in ihe classroom will attesi to the value of learning geography on a need-to-know basis. Adding relevance and a little fun and excitement to the fearntng...

Info Lvt Radio Amateur 11-1990

Tue, 27 Sep 2011 01:14:03 GMT

Mobiles FT-212RH. 2m FT-712RH. 70cm w FT-912RH, 1.2 GHz FT-4700RHT, 2m 70cm Hand Heids FT-23R, 2m FT-33R, 220 MHz FT-73R. 70cm FT-411. 2m FT-811,70cm FT-911,1.2 GHz FT-470 2m 70cm 71 Meadow Road, New Castle, Del. 19720

Dealer Inquiries Welcome Radio Amateur 11-1981

Tue, 27 Sep 2011 01:13:42 GMT

Universal Electronics, Inc. 1260 Aida Drive, Reynoltisburg, Ohio 43068 2 Meter Crystals 3,95 each 10 or More 3 50 each P.O. Box 436 Department 7 Dunellen, IN. J. 08812

KENWOOD Quq Radio Amateur 10-1995

Tue, 27 Sep 2011 00:56:04 GMT

YAESU Ham amp Vertex Business Radios rr ssc, FT-SSP FT9500L FT1 1, Ft-230 , FT-S90h FM 00 0 530 FT- 5 0 FT411E, FTAfI Ffi -l oB. F7-23H. FL-7G 0 Linaar. to V P 5C03 SynirissfZEd repeler 25 WBftbr YHF 0r UHF. VEW WARANE VJ M-1CQ HAM, MARINE. BUSINESS AND AViATJON RADiOS. 61-H, 4ai H. S34tfH. 270Q-H.IC-D1W, GP-22A Nsvi R30LT F40LT, HI 6. U16, snd repeated. SHORTWAVE RECEIVERS R-l.H-1QD,fl-7000. R-9000 R-71, GP-22A. TS-SOS TSJ-SUS'AT. R jflM TSflBiH, TV J4l.- 41A. TR-rSIn KfllwMm i urvlc P-ip-nr...

ICOM IC compact MHz all mode transceiver Radio Amateur 03-1980

Tue, 27 Sep 2011 00:51:01 GMT

loom's K gt 551 is an all mode 8 meter unit in a compact, easy to use instrument which uses a built-in microprocessor for frequency control and scanning. The no backlash, no delay dual VFO light chopper system Is included as a standard feature and provided spilt frequency operation as welt as corn pletely variable offsets. It covers 50,000 MHz to 53.999.9 MHz and features a 8 digit frequency readout, 2 digital VFO's, built-in AODC power suppty, variable output from 1 to 10 watts, dial lock...

The Twin Bander Radio Amateur 11-1989

Tue, 27 Sep 2011 00:28:11 GMT

The A LI' Lt i Miidei DK-37 is a dual band transceiver offering small package. The independent main band and sub-band operation duplex operation. The front panel is easy to read and understand. The display lets the operator know at a glance which functions are in operation. The built-in duplexer has a single antenna output for a dual band antenna. LINl has listened to the consumer and in response has created the versatile l 5'v- I which is truly user-friendly with minimal effort.

If Amplifier Radioreceivers

Tue, 27 Sep 2011 00:24:01 GMT

An IF amplifier is basically an RF amplifier with a fixed tuned input and output. The tuned circuits act as bandpass filters, accepting the IF but rejecting other frequencies. Since they are fixed tuned, the tuned circuits have constant Q. With variable tuned circuits, like those in the TRF, Q varies with frequency. Response may be too sharp at one end of the frequency band and too broad at the other. In a superheterodyne, the response is more uniform because the IF circuits are fixed tuned. In...

Info Qgl Radio Amateur 02-1984

Tue, 27 Sep 2011 00:18:42 GMT

ORBIT is the Official Journal for the Radio Amateur Satellite corporation. AMSAT , P.O. Box 27, Washington, DC 20047. See Lrsf 0 Advertisers on page 98 Irlx printer , I am obviously not a an of mechanical systems J was Surprised, I here foreh to note that 60 of traditionalists plan to Keep heir mechanized RTTY As more Ad more computers come mio amateur-radio shacks, so ihe desire tor higher transmission speeds takes on a more undent note After years ot watching news agency reports prim at 50...

International Rtty Art Competition Radio Amateur 01-1985

Tue, 27 Sep 2011 00:16:52 GMT

The Wireless Institute of Australia is running an International RTTY Art Competition as part of Its 75th anniversary celebrations Entries must not contain more than three over linings and must be sub mitted wllh a hardcopy printout and Baudot tape Category. Include. ia best hand.generated Original submitted Oy its author outside VK bi best hand-generated original submitted by its author who is a VK. and c best non-original hand-generated or computer generated RTTY picture. The completion closes...

Suction Cup Mount 1 Radio Amateur 04-1988

Mon, 26 Sep 2011 23:59:07 GMT

i DE 4L fOU 4P4ATiff.XTS Ott Of Ff CES' Mo un f tiI inienrn te anfnii ft T thf HEST CO gt - ngfc. T-H VERY po rr ul lo licn curs . N inE gt for k Whip r ltwop 1 iM fold lq find, ti Mt iDlrAn ti MUST Tor prop m ho Irnel Rm J - OO MH t oi iiit ir.r T0-Z3G M Hi rth up to Jo Vf ids Complete with IV III' RG amp and Lh iL-1- l PI.259, ANC. Moioto a or F- connector pacify mante lar itjirn ordering Han Ely i ipiikti you an fiit hert VOL inl itH Mtf ii Mai mtn r for fnif ijfltchiir cop gt . f -fftt in...

X Gzl Radio Amateur 01-1966

Mon, 26 Sep 2011 23:58:43 GMT

HAM Wholesale Card Club Catalog Dept. If all you want to do is get some output on 432 mt the procedure is simple buy an MA-4062 and build a trip er to multiply your 144 mc transmitter output. If the object is to play with or demonstrate the use of variable-reactance diodes in frequency multipliers or other applications, there are cheaper diodes that will do the job very f ig, h Experimenting with varactors. 'his circuit uses a common silicon power diode to double from 80 rn to 40 m. well, at...

A Lovely Cover Radio Amateur 13-1976

Mon, 26 Sep 2011 23:56:44 GMT

Mr. Harry Goldman has managed to tell us a number of new facts about Tesia, which is quite a feat. Most of what we get is a capsule subluxation of H. Gernsback, who knew him best. Goldman's research and understanding make his article a landmark. I have been told, long ago, that TESS-la is not the proper pronunciation, that TESH la is. I don't know any Croatian, so I don't know this for sure. One thing I do know Tesia invented the roller coil tuning inductance. He shows it on a patent drawing...

QEX Twy Radio Electronics 1990-08

Mon, 26 Sep 2011 23:46:38 GMT

High Efficiency Power Amplifier SIMulator Design Automation, Inc, announced a new computer program in the High Efficiency Power Amplifier series, HEPA-SIM, simulates high-efficiency Class E RF power amplifiers making it easier to design these desirable circuits. The program computes the steady-state periodic timedomain waveforms in a single-ended switching-mode RF power amplifier, it also computes the dc input power, RF output power, all of the power dissipations, and the RF output spectrum....

Antennas and Antenna Matching RadioHandbook

Mon, 26 Sep 2011 23:18:48 GMT

Antennas for the lower frequency portion of the h-f spectrum perhaps from 1.8 to 7.0 Mc. , and temporary or limited use antennas for the upper portion of the h-f range, usually are of a relatively simple type in which directivity is not a prime consideration. Also, it often is desirable, in amateur work, that a single antenna system be capable of operation at least on the 3-5-Mc. and 7.0-Mc. range, and preferably on other frequency ranges. Consequently, the first portion of this chapter will be...

Tda Tdb Radio Amateur 07-1988

Mon, 26 Sep 2011 23:16:11 GMT

Coding lor the above tabfe DCAL - Dual Coded Relay uuch 4QCFIL 4 jigit Coded Relay Latch RY - Relay NOjNC Normally Open Normally Closed Refer to the 4D CRL foil layout in Figure 10. The builder must connect a wire trom the collector of Q1 to the blank space of the card-edge connector after the fourth card edge trace from the left , i his allow s connection of external relays. LEDs. etc. Make sure to lest each module individually. Hand-draw a diagram using only the completed module as a...

A New Frequency Counter PlugIn Unit for Direct Frequency Measurements to MC Vintage 1961-01

Mon, 26 Sep 2011 23:15:52 GMT

ONE of the significant steps in extending the usefulness of the high-speed frequency counter was die development of the piug-in frequency converter. This converter enabled the accuracy, speed, and convenience of the basic 10-megacycle counter to be extended by several decades. Now, an additional converter has been developed that enables frequency measurements to be made from 100 megacycles to above 500 megacycles. Like the other converters, the new unit enables these measurements to be made...

Info Rcf Radio Amateur 07-1988

Mon, 26 Sep 2011 23:15:38 GMT

UHF MODEIS KJtwttnC 69 JUtlesiCw H9 Wttti kW 4 SS U JS-30 435-4 JT S30 1 4 149 4U4K WM 4JJS Si cdt iok for full tint of2w transmitting converters for vtjfAuhf. Hits only S 79. Linear Amplifiers Mvall. up to 50 65-J MOUL ROAD HILTON NY 14468-9535 Phone 716-392-9430 H tntftm em it m rtgii iwrwft trmttrnmark. Hornblower does more than jusT horns. Originally, a DTMF coded system was conceived to allow remote control of household features, such as Lighting, air con-djt toning and hoi w ater heating...

by Paul J McClellan Vintage 1987-08

Mon, 26 Sep 2011 23:13:21 GMT

HE IDEAL EQUATION SOLVER reliably finds all S solutions for an arbitrary variable in any equation defined by the user. Since this is provably impossible in general,1 more realistic expectations are to solve for an arbitrary variable in a wide range of equations, to provide understandable and reliable diagnostic information should the solver fail to find a solution, and to provide the means for using the solver to obtain multiple solutions of an equation if more than one solution exists. These...

Guide To Rtty Frequencies Radio Amateur 01-1984

Mon, 26 Sep 2011 22:49:19 GMT

Interest In monitoring RTTY signals in the shortwava spectrum has caught I he fancy of thousands of hams and SWLs. Receiving RTTV signals has been grealiy simplified through the use of computer technology and stabfe HF receiving equip ment. in Keeping pace with this explosive groAlh ihe second edition of the Gutce to RTTv Frequencies has double the amount ot information and number qt pages as the 1960 first edition. Compiled and edited by O P Ferret , the Guide to RTTY frequencies details the...

BNB Nyl Radio Amateur 03-1990

Mon, 26 Sep 2011 22:20:12 GMT

8 disk sides over 200 Ham programs SIS.95. 25c stamp gets unusual software catalog ot Utilities, Games, Adull and British Disks. Home-Spun Software, Sox 1064-B , Estero FL 33928. BNB917 100 QSL CARDS S9 Shipping included. Free samples, Shell Printing, KD9KW, PO Box 50Ar Rockton IL 61072. BNB921 EASY PCBs using our popular transfer sheets inexpensive. FREE details. PCBs. Dept H1, Box 13534, Kanata, Ontario, Canada K2K 1X6. BNB923 Barnstable Radio Club will hold their Annual Hamfesl Saturday...

Channel Signaltonoise Voter Radio Amateur 04-1993

Mon, 26 Sep 2011 22:18:31 GMT

Expandable to 32 Channel by Just Adding Cards LED indicators of COR and Voted Signals Remote Voted Indicators Pinned Out 4Va x 6 Double Sided Gold Plated 44 Pin Card Suiit, tested and ca ibrated wilh manual

Repeater Voter Radio Amateur 04-1986

Mon, 26 Sep 2011 21:59:08 GMT

pand4t F to ZZ Channel by Just Adding Cards Designed Tor Commercial and Amateu' Servtce Dual or Single 2 Volt SuppLy LEO Indicators of COR and Voted Signals Remote Voted Indicalofs Pinned Out 4Vi' y 6 Double Sided Gold Plated 1 P n Card On Board Audio Switching and Mining Audio Mixer Input Available tor External Input Open Collector or Relay Contact Input 4AV Kit including board and parts wlih 20 page manual. . -, 1200,00 Built, tested, and calibrated with manual S3SO.DO VOTER Kail...

General Radio Test Eqpt Radio Amateur 03-1971

Mon, 26 Sep 2011 21:27:08 GMT

G.R. 107L Var. Ind 40.00 G.R. 107M Var. Ind. . 40.00 G.R. 1021 P2Sig. Gen. 250-920 mc-with P1 Power Supply 195.00 G.R. 1105A FREQ'. MEASURING EQPT. CONSISTING OF 1106A Freq. Transfer Unit 1106B Freq. Transfer Unit 1107A Interpolation OSC. 110SA Coupling Panel 1109A Comparison Bridge comes complete with Speaker Si housed in 6 ft. Relay Rack 350.00 G.R. 1203B unit P.S 25.00 G.R. 1219A unit Pulse Amp. 25.00 Meter 75.00 G.R. 1750A Sweep Drive 75.00

Saudi Arabia Radio Amateur 02-1984

Mon, 26 Sep 2011 21:22:22 GMT

An exception to the no iSflor P lt jhcy ol Ihe Middle Eastern counties was mjoe for the recent visit of Lloyd and Iris Cokm. W6KG and WfcOL of Yasme DXf dihon fam The Colons managed not only io visit most of ihe counties in the region, but also actually obiamed permission to operate in many of them Iris faced special problems in Saudi Arabia. Women occupy a very special rate in the Arab worltf, quite dillercmt from lhat in the more liberal Western nations Worn-en are seldom seen oul in public,...

S At Af For Dab Le Pric Radio Amateur 10-1981

Mon, 26 Sep 2011 20:57:29 GMT

Where else can you get a value-packed radio at such FM-5 PC Board Kit - ONLY 1 59.95 complete with controls, heatsinkr etc Cabinet Hit microphone, crystals, etc. available separately SAVE A BUNDLE ON VHF FM TRANSCEIVERS 10 watts, 5 Channels, for6M, 2M,or220 FM MODULES FOR REPEATERS, LINKS, TELEMETRY, ETC. VHF Kits from 27 to 300 MHz. UHF Kits from 300 to 650 MHz. Broadband Kits 20-650 MHz. Prices start at S14.95 VHF and 18_95 UHF ' All preamps and converters have noise f lt gufe 2dB or less T51...

Allmode Transceiver Radio Amateur 03-1982

Mon, 26 Sep 2011 20:54:20 GMT

Trio Kenwood Communications has announced a unique new radio, the TS-660 Quad Bander ' an alt-mode transceiver designed for operation on 6, 10. 12. and 15 meters. The unit features built in dual vfo's, a five-channel memory, and memory scan. Modes ol operation The TS-660 s rf output power is 10 Watts on SSS, CW. and FM, and four Watts on AM, The radio operates from a 13,8 volts dc power supply. Kenwood's list price is 699,95. Additional information may be obtained by con lading Trio-Kenwood...

Mfj Enterprises Radio Amateur 04-1974

Mon, 26 Sep 2011 20:43:43 GMT

COLUMBIA PA YS We need these today now SP-60Q JX HAMMERL UND RECVRS P.S. We're also hungry for Bendix, Collins, Tektronix, etc. ab equipment ' late model military eiec, for ground, sea, air other good gear. We pay freight Airmail cond. amp wanted today - NOW We're desperate

Select Capacitor To Tune At Each Xtal Frequency Radio Amateur 06-1967

Mon, 26 Sep 2011 20:32:37 GMT

Fig. 2. Conversion of the SW 120 receiver to six meters. L consists of fO turns number 26 closewound on a 1 411 slug-tuned form, L2 and L3 are both 12 turns number 26 closewound on a 1 2 form L4 and L5 are 30 turns number 30 closewound on ' V form L6 and L7 are 11 turns number 26 closewound on a slug-tuned form. except for the minor changes shown in the carrier balance control and transmit-receive switch. Also, the VFO was adjusted to cover 14,0 to 14.150 MHz to the 12BY7 mixer. This was only...

TEirMODE RESONANCES IN PRECISION COAXIAL CONNECTORS Radio Experimenter 1966

Mon, 26 Sep 2011 20:21:23 GMT

It has been common practice to specify the upper frequency limit of a precision coaxial system as the calculated frequency at which the next higher mode above the TEM mode TEn could propagate in the air-dielectric section of the line. It has, of course, been recognized that this mode can propagate in dielectric support beads below this frequency, but the interaction between the TEM and TEn modes is insignificant if the effective electrical length of the bead is so short that a TEu-mode...

JAN Esj Radio Amateur 12-1997

Mon, 26 Sep 2011 20:15:05 GMT

GALLATIN, TN The Tennessee Valley Amateur Radio Network will hold its 8th annual Hamfest and Computer Show at the Gallatin Civic Center. Setup Fri. 5-9 p,m lt t Sat. 5-8 a.m. Open Sat., 8 a.m.-2 p.m Tables 10. Adm. S5, XYLs and under 16 free. Talk-in on 147.90 .30 T 114.8, Food available. Free parking, handicapped accessible. VE exams by pre- registration only. Send 610, copy of license or certificate of successful completion, and an SASE to Ronnie Gilley. 512Hillside Or, Gallatin TN37066. For...

David R Gildea Vintage 1969-12

Mon, 26 Sep 2011 20:00:13 GMT

Dave Gildea received his jgj , BSEE from Stanford in 1966 ' and is working on his Master's. He joined HP as a production fBHj HB jM engineer on the 8410Micro-vSPWBHpJjjH wave Network Analyzer and HS ra B aided in the development of ''- the 8413A Display Unit. Dave tB - mK designed the 8412A and served , flBP . as project supervisor during A the development of the A SB 3 System. He enjoys many of jW SH California's outdoor sports, pjk tI 19 I including skiing, back packing, swimming and...