Networking Conference Proceedings Available
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
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
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
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
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
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
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
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
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
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
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...
Modular Microwave Breadboard Svstem
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...
First Choice Among The Nation S Am A Teurs
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
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
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
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
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
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
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
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
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
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...
notes on power Measurement in communication Circuits
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
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
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
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
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
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...
LowCost Servo Design
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
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
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...
Helical Resonator Preamps
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
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
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
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
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
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,...
Microlog 1
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
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
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
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
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
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
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
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
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...
Meters
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
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
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....