Feature Moldedon Connectors And Factory Testing

Since February, AP Products Irrcorported has had a directly interchangeable, fuily assembled lumper line thai is a cost effective alternate 10 squeeztMype keyer paddle is necessary. Also, operators who, like ihis writer, are real key thumpers, will probably prefer an external paddle with a weighted base to keep ii in place during use. Its small size, light weight and self-contained batteries should make the CMOS 8043 especially popular with campers, backpackers and DXpedition types who haw...

Sr

Daylight reat-ttme doud cover pictures Visible and Infrared cloud covor pictures in daylight, IR cloud caver pictures at niyht Table 2. Potar orbiting weather satellites. make some major contributions at the same timcl Sate fite Picture Modes. The iwo videif modes of greatest interest lo amateurs are highlighted in Table T. Both modes utilize a 2400 H audio subcarrier to nansmit the video information, Subcarrier amplitude varies from maximum for white picture areas to minimum (approximately 4 ....

Disable Line

Fig, h Block diagram of the PROM CW generator NAND gale with open collector outputs used as the input for the transmittci keying circuitry. Clock pulses i or the memory are generated by a relaxation oscillator corv sislEng of Q1 and 02 and associated parts.1 The oscillator is the same one used in my keyer and was selected so that the speed controls could be ganged and would 'rack in the event thai the keyer would be packaged with the memory (it wasn't). PROMs are fabricated wilh all logic...

Logic Probe

Now A Digital Logic Probe kit at a realistic price. Red, Green, and Yellow tight emitting diodes signal the presence of logic levels encountered in digital circuitry. Utilization of transistor and integrated circuit switching techniques permit the DtGAPEAKE-A to indicate logic 1( logic 0, and pulsing circuit conditions. Complete kit including easy instructions is available now from . . . P,0. SOX 341 Havre de Grace, Md, 21078

I

I 160-80 dual impedance dipole antenna. John Skubick K8ANG 1 040 Meadow brook V arren OH 44484 City lots and bank accounts have something in common for many off us. Both Lend to be small Here is a cheap antenna system that covers both 80 and 160 meters, but is the size of an 80 meter inverted V ' with no ground radials. If youi city or suburban lot is typical, you'll barely have room for one 160 meter radial, let alone several On 80 it is an inverted, folded dipole. The feedpoint impedance...

S D Sales Co

Thousands of hobbyists have bought and built our original clock Kit and were completely satisfied. But we have received many requests for an alarm clock kit with the same value and quality that you have come to expect from S.D. So, here it is 1 Mostek 50252 Alarm Clock Chip 6 Hewlett Packard .30 in. common cathode readouts. 1 Etched and Drilled P.C. Board set 2 Slide Switches for alarm set and enable Why pay MORE MONEY for our competitor's clock that has LESS DIGITS that are SMALLER in size...

Please Add Shipping Costs To

Bjrtk Arrtfcird S 10,00 mmiirurtf No B& F ENTERPRISES 119 FOSTER STREET PEABODY, MASS. 01960 (617) 531-5774 532-2323 BOX 219 HOLLYWOOD, FLA. 33022 (305) 921 2056 Gty of 6 or more when each kit is purchased with a transformer, PC board, and cabinel.

Info

Table L Code conversion table for programming the 8223 PROM in the Baudot to ASCII RTTY TVT, nected the bridge into the TTY loop circuit A check was made to assure that the parallel Baudot output code was appearing properly on pins 8 through 12 on the UART. The Strobe Pulse Generator was wired next and again checked to be sure that the 500 microsecond pulse was beinft generated when a key was depressed on the keyboard, Tine FIG LTR ease detector was then wired and a circuit check was made to...

Nc

Schematic ot Ihc PROM Cl genern tor-bey er. designed specifically for my CW operating habits, Many variations in construction, chip enable and address circuitry, memory size (hits), and PROMs are possible. Usin i my board, ioial construction costs should not exceed 60.00 assuming the reader had to purchase all the parts, Approv mateiy 40 of the cost is for the PROMs. 1 would like to thank Alan Burgstahler WA6AWD for providing negatives and prototype circuit hoji Us while developing the...

Ft

Here is a compact, versatile transceiver designed for the active 2 meter enthusiast The FT-221 features ali mode operation-SSB FM CW AM-with repeater offset capability. Advanced phase lock loop circuitry offers unsurpassed stability and clean spurious free signals. Modular, computertype construction offers reliability and ease of service. Preset pass band tuning provides the optimum selectivity and performance needed on today's active 2 meter band. Join the fun on FM, DX, or OSCAR, with the...

Pottstown Pa

The Pottstown Repeater Team Hamfest and Fle i Market will be held on Sunday, May 23 at 9 am to 4 pm at Rt. 422, Hiway Drive in 8 miles cast of Pottstown, There will be prizeSj auction, conu-sis, and refresh ments* Talk-in 52 52, 81 21, 66 06, Registration 2 - tailgate 1. For more information contact A. Jeffer wn WA3VYS, 444 Roland Avenue, Pottstown PA 19464. The Radio Amateur Club oi Knox ville will hold its annua Greater Knoxvilie Hamfest on May 29 and 30th at. the Manorial Guard Armory, 3330...

Balanced Feedline

L1-L2 fflumhitronlc 2410 or Poly coils 1780, 1 OF inch, 3 inch diam, CI Three section broadcast type, all sections paralleled. C2 200 pF per section may he used with J00 pF in parallel. Note Do not ground any portion of L2or C2 - leave them floating above ground on insulators. trofs, because they are now preset for 50 Ohms, Do your tuning and loading with the coupler, which will transform whatever impedance and rcac-lance is appearing at the shack end of the feed...

Veahg

Certificates ior high CW and phone in each state and country. Members of the Michigan Week QSO Party Committee are not eliyible for individual awards, A summary sheet is requested showing the scoring and other pertinent information, name and address in BLOCK LETTERS, and a signed declaration that all ruies and regulations have been observed. MICH stations include name of club for combined club score. Party contacts do not count toward the Michigan Achievement Award unless one fact...

Unbalanced

Schematic representation of 1 1 antenna bal un t were, there would be no need for a balun, The proposed balun design was first described by Roberts5 in 1957, but has not been presented in amateur publications. Fig, 2 shows a schematic representation of the balun some of the details are visible in the photo. From the antenna's viewpoint, it is being fed by two equal conductors in a balanced feedline configuration from the transmitter's side, it looks like an unbalanced 50 Ohm load, the...

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...

Meter antenna

At last A high performance, 2-meter antenna that combines state-of-the-art electronics, corrosion-free fiberglass and take-apart design for true portable use. The Hy-Gain 272 is an entirely self-supporting 21' omnidirectional antenna system that separates into three pieces for transport. It consists of 4 stacked 5 8 wave radiators with three 1 2 wave phasing coils and a 1 4 wave decoupling system. Each section length is specifically computed to completely eliminate end-feed pattern tilt keeping...

Vhf Engineering

Bob Brown W2EDN. just back from one of the Windjammer cruises the Caribbean, is really hot for a good design engineer to help him work up somp new products, If you know of anyone who likes to do that son of 'work ' have them get in touch with Bob, Bob is looking for someone with a lot of background in PC board layout and design and he's got a dhrned ijood salary ready for some one The Binghamton area is a nice one ,. I gat her that Bob and his family enjoyed the cruise , we've been advertising...

Z

Coincide with center hole of the dowel. Solder a 3 piece of center conductor from coaxial connector. Fish the loose end of wire up through the wooden dowel and oui the side of the plastic insulator. Next, fill in the PL-259 connector with epoxy and set the wooden dowel into the connector. Be sure to pull the center conductor wire as you work the dowel into the epoxy. Let epoxy set up until hardened, Next, wind a coil using 12 copper wire l 2,r ID, 4 turns . Bend the ends of the coil and leave...

ImiLine Instruments

Box 473, Hooksett, New Hampshire 03106 .Uli. Mj.n Su . tthrilnrd K1A U rL.h Mhnm HI Jllh-fl flL .Uli. Mj.n Su . tthrilnrd K1A U rL.h Mhnm HI Jllh-fl flL About ten years ago, the Summer Institute of Linguistics SIL here in Brazil was granted permission to use radios for communication between our centcrs and remote Indian villages- SIL is working here and in other countries with people who speak some of the more than 2000 unwritten languages of the world. Our purpose is to learn these languages,...

Ill Lu

The HAL ST-6000 demodulator keyer a nd I he DS-3000 and DS-4000 KSR RO series of communications terminals are designed to give you superlative TTY performance today and in the future, DS series terminals, for example, are re-programmable, assuring you freedom from obsolescence. Sophisticated systems all, these HAL products are attrai. tively priced for industry, government and serious amateur radio operators. The HAL ST-6000 operates at Standard shifts of 650 425, and t70 Hz. The tone keyer is...

Cwr

16vdcat37ma utput voltage 6vdc lnput-1 SvRMS 12vdcinput-3.5vRMS 16vdc input-4-0vRMS K-1 Field replaceable, plug-in, frequency determining elements 3.00 each W. G. Moneysmilh W8KUT 21 740 Military Dearborn MI 48124 T he majority of the commercially made two meter FM hand-held transceivers today have I or 2 Watts output into quarter wave antennas or rubber ducks. There are many times when an FM operator wnuld like to have a little more gain to work out better from poor locations. This article...

Uncomputer

Lot- .Jriuiifftg AJtf . -- S fC - . y -r- irmi H i e comp j p - yiiflrr fen . -.ni KnybO 1 T mwltlM o gt m iUin Hi.-MICRQAL fArrt tonvjrmr rmf video Ouan wifh Qrftihjo CJpJtHi'TV CP'J ROM.'R AM bc il harkfilafMf rt'fh piTrtir lupp'lv PT1 cahlrtfll Ih CPU board melud an Q08Q rticenor. 51 Uytf, at RAM, qpqce Fot 3K byt i o HOM anH v cTared nief rupit. Several CPU tmait i may b gt plugged rUo ihe lam tuck plane Icirpurallal procesung Th ti ckpl rw dmgf 4t un qo ii ihat if ah owt m ny batkptamn be...

Federal Communications Commission

This Notice was received too fare for inclusion in the February, March and April issues. Please be advised that we have the unique situation of having recovered a Unimetrics Ultracom 25 with no obvious fD or serial no. Would you please change your lost column in 73 to include found Request that interested people contact David M. Si oner K8LMB, 619 Doepke Lane, Cincinnati OH 45231 Keep up the good work with 73 I love it. HIJACKED RF Comm. Inc. RF 403 two meter transceiver, s n unknown. 4 Chan....

From Genave

144 rreter FM, IK channel com frnat.cns, 12 watts IncL 223,5 MHz 1V4-Meter FM 100 Channel Combinations 12 watts Separate controls for independent transmit and receive frequency selection . . . Pre-selected paired frequency lock allows one knob operation . . . Backfighted.

Kit

SPHERE 1i rMity pni melody tJu- iotbti la-EhSO Ji tnl-croprnccstor. 4K RAM. IK EPROM containing jn EDITOR, A55EMI1I FR. lit lll.lt, Gtfi COWMANIJ ANCllAOt, CASStm LOADER, Ptl.Mrtk LFTILtTlfSi, a HE Al.- I iMt CLOCK. p ut ill character vfeteo tntwtn p. with iijli Asa I krybci rrf jntl numLbirc. cuir gt 4' keypad, po ir , chassis, rn.inudEs, and js l ialvd parts SPHf KF 3 Includesill - 'u-- - SPHERE l pluv serial omfhuniCJ-tions, jtjuttto fji riu- or MODtM innate. SPHERE 3 inli.id H th - iejhjre...

Dark Horse

ver have a run of luck when nothing goes right You know, when 11 seems Irke the gods have things stacked up against you. That's just the way 1976 began Actually, it began in early December when some low creature decided that he needed my tcom IC2F serial -4893 if you happen 10 run across it more than I did and went to the trouble of purloining sand radio from under the dash of our '63 Cadillac. 1 said trouble, since ii no being my nature To Trust mounting brackets and such, I had drilled three...

Ij

Mfj Cmos 8043 Keyer

Switching techniques, so the circuit shown should be usable Without modification. Time has prevented more ideas from actually being tried out, but we would like tt 1 pass on a few applica tion hints which might suit individual requirement First Repeater antennas can be switched by tone from mobiles or remote pom - tt1 gt ro de more favor ablle selected ar-a communication A timer or second tone can restore normal condition. Second Two antennas can be switched in a mobile to offset un desired...

Insulator

Rain Gutter Antenna

Rrr r u,' '. gt gt J fs .'J ' J A-1 'rYrr77T7s rrr r u,' '. gt gt J fs .'J ' J A-1 'rYrr77T7s Fig. 7. One way to avoid publicity is shown here, it possible, wire sma i enough not to be seen, but strung low, wil do a good job. I believe is a functional all-band antenna system thai anybody can use successfully, which is something that most other articles discussing antennas for urban dwellers seem to ignore. To start, let's be honest about one always overlooked fact the utilization of an indoor...

Tempo VHFONE

The ONEyou've been waiting for No need to wait any longer this is it Whether you are already on 2-meter and want someting better or you're just thinking of getting into it, the VHF ONE is the way to go. Full 2-meter band coverage 144 to 148 MHz for Transmit and receive. Full phase lock synthesized PLL so no channel crystals are required. Compact and lightweight - 9.5 lornj x 7 wide x 2.25 high. Weight -About 4.5 lbs. Provisions for an accessory SSB adaptor, 5-diyit LED receive frequency...

Crystal Oscillator

TRADES TAKEN ON NEW EQUIPMENT WE PAY SHIPPING VIA U.PSOR BEST WAY ON ALL ABOVE ADVERTISED ITEMS. SATISFACTION GUARANTEED, ALL ORDERS EXPERTLY HANDLED TO ASSURE SAFE ARRIVAL WE ACCEPT MASTER CHARGE. N.C. RESIDENTS ADD 4 SALES TAX. PHONE BILL SLEP 704 524-7519. . P.O. BOX tOO, HWY. 441, DEPT. 73, OTTO, WORTH CAROLINA 28763 ptus 2.50 shp j. amp hndlg. .Stainless steel bands 5.50 NY residents please add sa es tax