Electronic Design Calculator

Electronics is a busy and creative field. Even the best technicians and theoreticians can usl> some help with the myriad calculations necessary to develop new products. That help has arrived The Electronic Design Calculator from instant Software makes your TRS-80 the hardest worker in your lab (next to you, ol course). The Electronic Design Calculator brings dozens of complex calculations down to size in seconds. It can calculate two of the four possible values of Ohm s Law for A C and D.C.,...

Ham Help

Does anyone know anything about the technical operation of the ATC Zenith ' SAVVY1' instr ment I will pay a tinder's fee for the first good information. Mike Reynolds WOKIE 3826 So. 92 E. PI. am in need of operating instructions and especially the schematic for a Royce CB, model I-636. The fine-tune control is causing some FMing when it is used for a swing of more than 4 kHz, Any comments would be welcomed. I will gladly pay for a copy of the operating instructions and schematic. Many thanks....

Maple Ridge Bc Can

The Maple Ridge ARC will hold its Hamfest 81 on July 4-5. 1981, at me Maple Ridge Fairgrounds, located 30 miles east of Vancouver, Maple Ridge BC. Registration tor hams is 4,50, a program with a ticket for a drawing is 2.50, and the dinner and dance is 10.00. Registration for non-hams over 12 years old is 2.00 non-hams under 12 will be admitted free. There will be food and camper space (without hookups) available. Features will include prizes, a swap and shop, a bunny hunt, a ladles' program,...

Cmos

LM301V .34 LM555Y .39 LM1414 1.59 L M308V 98 LM556 .69 L M 1458 V .69 LM309K 1.49 LM565 99 LM1480 1.39 LM31 V .64 LM566V 1.49 LM1489 1-39 LM317T 2.29 LM56 V 129 LM1 0 2.99 LM318V 1.49 LM723 49 LM1889 2.49 LM323K 4.95 LM 733 .90 LM390G .59 LM339 .99 I M747 79 MC1330V1 89 LM377 2.29 i W748V 59 MCt 50Vl.29 LM380 1.29 LM1310 2,90 MC1358 1.79 T TO 22i V-8PTN K TG-3

I

TS-820S, in a package that matches the TS-830S flagship. tf saies of the 520S that this rig replaces are any indication, this rig will be very, very popular. Moving abruptly to the UHF spectrum, Santec was pleased with the interest shown in their ST-7T 440-MHz synthesized handheld. The unit tunes 2000 channels in 5-kHz steps, with thumbwheel-switch frequency selection Control operators for repeaters should be happy about the standard 16-tone DTMF pad and the optional synthesized CTCS5 encoder....

Electronics I

II you're still designing circuits the old-tashioned way, let the Electronics I package Introduce rhe latest way to go. Tuned Circuits Coll Winding Design tuned circuits for audio and radio frequencies This two-part program will find rhe two missing values From any two o( the following frequency, capacitance, inducrance, or reactance, The coil-winding section wilt calculate the number of turns and wire gauge required for a close-wound, air-, or slug-tuned toil From the inductance, diameter,...

Tooting Our Own Horn

We re extremely pleased to report that two long-time 73 authors walked away with the top awards at this year's Dayton Hamvention. it's the first time ihese prestigious awards have gone to journalists. The Ham of the Year Award went to EricShalkhauser W9CL Shaw is the author of the History of Ham Radio series which appears in 73 and in QCC News He was honored for his very long dedication to amateur radio and Its history. Bill Pasternak WA61TF is familiar to 73 readers as the author of our...

M

A samp e tog s ieet from WStWX, whi e using the CCD antenna and 150 Waiis input. struct a vatid antenna range for HF antenna measurements becomes a monumental task building an adequate, level ground plane of suitable dimensions, maintaining constant spacing of test antennas, and clearing of vegetation, VHF frequencies permit closer control of test conditions, due to both smaller radiators and antenna range dimensions. A Taco Jerrold Model AIM 719-B laboratory-level field-intensity...

Message Memory Keyer

Atfvctncetf CMOS messagt memory Fwo 50 char each rttffjrsag* storage pSDftfi af any speeti-pi y **** jnt upeed Longe message capai ly f(j np.f se tf Cc CO '. 0 0 1 ti* MB2VJIW AB VJM * it . - .liess gf on -v-tdct -de OSiL NV * ' 5 9 575 Sfjr* ot ne str C'WOS -eyer Seit comptpimQ oti tin d ds e lampic keymg wrf i ny squee e p ddie Speed, votume tont- tun arr erght conirots Lovk currvnf rfrjm C OS tJSry Qceratton -pott tie qm'JV > nr*1 h. f tyr Keys Qf-0 ttioc* i c j J si a e rjs Speed,...

Call Today Conley Radio Supply

Billings, Montana 59101 y input the program requires (aside trom speed-command changes, which are STOred in Register 8) is your odometer reading As output, it displays a TARGET TIME at which you should have reached that odometer reading Then, a quick comparison with your time standard (stopwatch, wrMwatch, or car clock) tells you whether you're running fast, siow, or on the button. Most drivers attempt to run slightly ahead of schedule, reasoning, that they can more easily lose...

World Time Watch

The first microprocessor watch made especially for hams The HAM-1 functions mctude local time, vwortd time, T. too) count-op and count down chronometer, day, month, date, alarm and hourly chime, It's tdeai for log-keeping, DX trme conversion and 10 minute LD timing. The HAM-1 fea tures a high contrast Seiko display and solar cell battery assist. Battery life js better than 4 years. The HAM 1 water resistant to 20 meters, ihe case is 100 solid stainless steel and the crystal is scratch resistant...

Weather Satellite

Valuable information in this first edition s not include a in Dr. Taggarfs just published book, The New Weather Satellite Handbook (see above). Chapters such as lHow to Build an Eiectric Timer for Satellite Tracking and Building an Automatic Control fan he Satellite Receiving Station will no longer be available when this edition is out ot print. Ttiis fs a good entry level text lor hose discovering the exciting new useof weather satellites. Regular price 4,95....

Frequency Counters

COMPLfTI KITS CONSISTING OF EVERY ESSENTIAL PART NEEDED TO MAKE YOUR CGUNT H COMPL T HAL- OA 7 DIGIT COUNTER WITH FR QU NCY RANGE OF ZERO TO 60G MHz FEATURES TWO INPUTS ONE FOP LOW frequency WD ONE FOR HIGH FREQUENCY AUTOMATIC ZERO SUPPRESSION M 3AS US' i 0 SEC OR 1 SEC GATE WITH OPTIONAL 10 SE GATE AVAILABLE ACCURACY 001e * UTILIZES IO-MH2 CRYSTAL b PPM HAL-300A 7 OIGI OUNTtR Wi'H FREQUENCY RANGE OF ZERO TO 500 MHz FEATURES TVYO INPUTS ONE FOR LOW FREQUENCY AND ONE FOR HIGH FREQUENCY AUTOMATIC...

Calendar

Jul 1 Jul 17 23 Jul 18-19 Jul 25-27 Aug 8-9 Aug 15-16 Aug 15-17 Aug 15*17 Aug 22 23 Aug 30 Sep 12-13 Sep 12-13 Sep 12-14 Sep 26 Oct 3-4 Oct 24-25 Nov a Nov 8 Nov 14-15 Nov 28-29 Dec 26-31 Colombian Independence Day Contest CW County Hunters Contest European DX Contest CW SARTG Worldwide RTTY Contest Rhode Island QSO Party New Jersey QSO Party Ohio QSO Party Occupation Contest European OX Contest Phone G-QRP Club CW Activity Weekend Washington State QSO Party OARC Corona 10*Meter RTTY California...

Dept Over Anticastro Broadcaster

The FCC's enforcement teams are bitter over the Justice Department's refusal to prosecute a Miami radio pirate caught broadcasting anti-Castro propaganda in the 40m band. Commission officials say they spent more time on that case than on any other unlicensed operator enforcement matter in recent years. Staffers are particularly miffed because they believe Justice dropped the case for political rather than legal reasons. The incident involved Jose Gonzalez, charged with unlicensed operation...

Microlog

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...

Tioga County Pa

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,

Ascii Encoded Keyboard

SaneTer 720 surplus keyboard. wi f gt parallel output. Tfm ice unit has been wrtttan up tot project numerous tirrw in 73 and other computer mag'j Sb Wl 5 Lbs 1A3012B. S g a LOTS MOPE SURPLUS COMPUTE PERIPHERAL EQUIPMENT AVAIL ABL CIRCLE RE AOE R SERVICE FOR OUR CATALOG Terms Add Poilase- MC VISA AE VVticAn Phone qra r-. wtitame on c itii cird ornrtv FREE GIANT CATALOG of ELECTRONIC BARGAINS SPEAKER KITS COMPUTER MAT'L KlTSfGADGETS TOOLS POWER SUPPLIES SEMIS THANSPORMEBS .000' of Electronic...

All Band Trap Antennas

PRETUNED - COMPLETELY ASSEMBLED-ONLY ONE NEAT SMALL ANTENNA FOR UP TO 7 BANOSI EXCELLENT FOR CON GESTED HOUSING AREAS - APARTMENTS LIGHT - STRONG - ALMOST INVISIBLE PRETUNED - COMPLETELY ASSEMBLED-ONLY ONE NEAT SMALL ANTENNA FOR UP TO 7 BANOSI EXCELLENT FOR CON GESTED HOUSING AREAS - APARTMENTS LIGHT - STRONG - ALMOST INVISIBLE FOR ALL MAKES MODELS OF AMATEUR TRANSCEIVERS - TRANSMITTERS -GUARANTEED FOR 2000 WATTS SSB IOOO WATTS CW. INPUT FOR NOVICE AND ALL CLASS AMATEURS' FOR ALL MAKES MODELS...

Ssv

Tures include seven 64-char-acter memories with battery backup to retain memory when power is off, 53-character keyboard buffer, auto word-wrap, scope outputs, automatic T R switch, two-page display memory, split-screen video, and a well-shielded cabinet for RFl protection Interestingly, the 7000E will operate on 13 V dc at one Amp, which opens the way for some interesting mobile or portable workT HAL no doubt is feeling pretty smug about the new interest n RTTY, and they were showing two new...

New Products From Trac

TRAC Electronics, Inc., has announced the introduction of two unique products for the CW enthusiast. The TRAC'ONE CW Processor, Model TE-424, is an advanced CW audio processor which receives the audio from any rig, passes it through a phased locked-ioop tone decoder removing all GRN and QRM , and reproduces afulty adjustable CW audio signal Frontpanel controls aliow full adjustment of frequency, tone, delay, and gain. The frequency control is adjustable frorn 300 Hz to 2500 Hz, a match for any...

Dx News

Could be found between 14020 and 14050 kHz daily from 0100Z to set up skeds for your 5BDXCC. QSL to PO Box 575Qt Bahrain. Benin K4YT operated from TYA11 incorrectly-issued call-sign untii April 25. QSL for this operation to W2TK, Another operator, ON5NT, operated the same station until May 2. strictly CW. QSL via ON5NT home address. Giorioso was to be on by FR7AUG untii May 11, time permitting. QSL to FR7AI Cailbook address. Kingman Reef A change in the schedule...

Before Buying

Louis, MO 63132 out of touch with the world for the duration of their voyages. Immediately, experiments were begun to improve receiver sensitivity and study propagation to find a way to improve on the reliability of transmissions, About this time, other transmitting and receiving stations were installed by Marconi and others. Finally, on June 4,1903, the silence barrier for ships was truly broken when the prestigious Cunard ship line began a series of...

House

S ACE DOwEl A9CHJT 2 F ROV BOTTOM OF ALUUthiUli TCBINQ SCREWS HOLD P C. DO EL TO AIL OF HOUSE side I drilled a hole in each vertical element about 1 2 from the bottom of the aluminum tubing drill through one wall of the PVC and into one wall of the aluminum . I put a sheet-metal screw into each hole and prepared to attac h the coax and the wire phasing lines. Since I made each vertical element 116 long and they were 1 4 wavelength long, I doubled the figure to get the half wavelength for...

Portable Two Meter Quad

A new collapsible antenna has been introduced by Palomar Engineers. Jt extends the range of low-power two-meter transceivers by providing the gain and front-to-back discrimination of a two-element quad, It is idea for boating, backpacking, moun-taintopping, and other portable applications since it gives the gain of a linear amplifier but does not require additional battery power. The entire beam assembly is housed in an 18 carrying case that will fit in a suitcase. For use, it unfolds to form a...

Twometer Trombone

Butternut's 2MCV colli near gain antenna with its patented Trombone phasing section offers performance unmatched by other 2 meter antennas in its price class and holds its own against taller and much more expensive gain antennas. ECONOMY, RtiLlABIl 1TY AND LONG-HAUL PERFORMANCE MAKE THE 2MCV TROMBONE i IE IDEAL CHOICE FOR YOUR NEXT BASE OR REPEATER ANTENNA,

Signalcrafter Directional Couplers

MODEL HF 231 1.0 to 30 mHz tor use wilh SO C04n f cable. Le_ss I ha- 05 dB riserl on SWR rT ix Equipped with i oSO-239UHFconn ior3 f rnpuM output which pi tigs dtri ctty imorenref Mijdel gt 30 3t and 35, of car be remote mourned. MODEL HF 231 A IB iq 30 mHj foruae with 75 ohm coadal calHe. oih rwisesame HF 331 Model HF l 1 dfiinserlii amp iiSWR R aponae Z 5 dB ovqr complete range oi 50 to 560 MHz, 1 0 dB from 30 io 1000 MH Equipped wilh type N connecTors. into Models 30.31 or 32 by using any...

Trylon Abc Towers

STAINLESS steel WHIP fiberglass loading coil - PATENT APPLtED. NO COILS TO CHANGE CSt - LESS THAN 1,5 VSWR ENTIRE TUNING RANGE TUNE 3,2 TO 30 MHz FROM THE OPERATORS POSITION Thii Model MT-tRT mobile antenna tunes 3.2 to 30 MHz inclusive 750 watts CW. 1 00 watte PEP for hatns military MARS. CAP, and commercial service. Center loaded lor high efficiency Enable inning to exact resonance to frequency Allocs lull output from soJid STafii inais Nc Aoriy aboul reduced output rem hut down c cuns....

Zip

I U S only Canada 7 60. oversea5 air mail 25 00 Prlcat sublet to ehenge without notice 5 elements superb gain and front-to-back ratio on 20, 15 and 10 meters. The installation of a ham's first directional antenna system is a memorable event because of the substantial improvement in the capability of the station. You really have to experience using a directional array at your station to appreciate the thrill of improved performance. A Hy-Gain TH5DX can do more for operating pleasure than an...

Wi

Covers from 0.15 to 29.999 MHz with PLL synthesized up- unversion circ uitry crystal lattice filter 48 MHz iirsi IF. l2- hannel memory. Dual readouts. Clock and timer. RF attenuator. Noise blanker, GILFER selective ot 2.4. 4.0 and 6.0 kHz at -6 dB . Receives AM, USB, LSB, CW, NBFM with 0.5 ixSf sensitivity. 100 117 20 230 VAC 12 VDC. North America's Shortwave Mail Order Place Clocks Filters Lists GILFER SHORTWAVE Dept, 737 Box 239 Park Ridge, N 07656

Reach Out And Crush Someone

You wouldn't think that the world's largest corporation, one with a 6 billion net income, needed a boost, a little help to compete in the marketplace. Well, think again In its ruling on cellu ar radio a new mobile telephone service that promises a dial tone in every Dodge the FCC handed AT amp T a competitive edge so sharp that others wanting to enter the field may never get a chance to try. First, some background. It all began about 12 years ago when the FCC and others realized that the then...

Diy Datong Rf Clipper Or Atlas Speech Processor Diy Schematic

Hal Ct2100

BIRD 43 142.00 All Bird Prod, in Stock ALL PRICES ARE SUGGESTED RETAIL PRICES PLEASE CALL FOR QUOTES er manufacturer and with good reason. Daiwa markets an extensive line of high-quality products in japan and their new distributor in the US plans to irrv port a good many of those items. Included in the lineup is a very compact audio CW filter with built-in amplifier and speaker, a speech processor, two world map rotators, an incredible variety of compact cross-needle swr meters, and a cordless...

Heath Gu Portable Generator

Heath Company has announced its entry into the emer gency auxiliary portable power market with the Heathkit GU-1820 portable power system. This lightweight alternator can produce up to 2200 Watts of 120-V ac, 60-Hz power enough to operate a ham station, an electric chain saw, or a refrigerator-freezer during a blackout The GU-1820 is designed for ham radio clubs, home owners, civil defense, and police and fire departments. It can also provide on-location power for construction and logging...

W

Now available lor the YAESU FT227RA, FT227RB FT207R, CPU250GR AZDEN PCS2000, PCS 2880 ICOM IC255A Update the F act ury-I natal led scannaf in your rig with our new a u lorn a He rBsume-scan Modult Mo more waiUng for a contmuous-carrier r6 dter to drop off. No mtue manually-operating ihe scanner-resume conlrol. The Scanner iof your rig itl t gt ecanirj eo exacllyas before The only difr rence s no your scanner sample a re er od Dy automaticall D gt passing a Dusy frequency rn amp seconds...

Aed Electronics

7 LUCERNE A0.t SUITE 120 DtPtk MONTREAL. QUEBEC, CANADA H3A 2Hft TEL. 514 737 72 3 As Wayne says, it's the oniy game in town ' It could use competition. In his review of the new Kenwood TS-830 transceiver, WB8BTH didn't give the TS-830 credil for all its capabilities, and didn't recognize Its heritage. He stated that the TS-830 maintains the dual-conversion scheme of the TS-820, The TS-82 is a single-conversion rig. and with the exception of the i-f shift, there Is no similarity be tween the...

Welcome T

With hotel space for only a few dozen guests, the Turks and Caicos Islands are not yet a full-fledged mecca With service by Air Florida, hotels are abuilding, Reciprocal ham tickets are relatively simple to get. T. you do your homework ahead of time The Grand Turk airport s a short flight out of Miami. They1 re just building the new terminal building. offered to send and get my license for me, Tim and Jeff headed out a couple days early to get their contest station and antennas hooked up, I ran...

Tentec

NOTCH FILTER PERFORMANCE ADJUSTED TO 1 kHz POINT. All 9 hf bands only crystals are needed for 18 and 24.5 MHz bands. Broadband design for instant band change without tune up or danger of damage to the final amplifier Another Ten Tec original Hang AGC for smoother action WWV reception on the 10 MHz band Digital readout in two colors, red for the 5 significant places, green for the 6th digit 100 Hz , Instant recognition. Separate receiving antenna capability. Switch receiver to a common antenna...

Msb Audio Filter

Banduidihl ei hfin 75 Hz. lo greater than IlillO H -F Nirttb 3 Kl'3000 Hz., Notch lt i pi amp 5U dH FHP dno IU 1 Wiit i I wnflbli NoTt h Fili gt f 6 Palf Fixed Highpuss Amlin Amplifier PnwfT Heqiilr m iitt Banduidihl ei hfin 75 Hz. lo greater than IlillO H -F Nirttb 3 Kl'3000 Hz., Notch lt i pi amp 5U dH FHP dno IU 1 Wiit i 12-14 Vt C 300 MA 110 V.if iiaoiial adapt t H 95 OHT gt l H TODAY If not cuniplettly iaiisfit gt d. relurn ttlltrin IS fur a pmnipt refund IfM chipping lihgl Add 12.50...

POWER

Giv your 2-miter rig real punch by delivering a poient 25 wan signal with only two watts ot drive also available set up for 200 milli-wait dnvei Compact and convenient to mount L'oCom s ModeJ 2C025 is ideal for car boat or anywhere you we got a 12 VDC source At only 84 95 I amp 99 95 for 200 mW dnve . it's thE perfect companion for vour Drake, f ncomm, Heru gt I mm Kenwood, Motorola. Standard, Wilson. Yaesu or other 2-meter FM triable 2 or 2 wan nominui drive specify 2 watt model datmers 15-20...

Isopol

The IsoPole lis building astartg fo cfea Tndesign and superi or performance. The compelled another large antenna aj prjjMsfgn modification to his most popular VHF Base Ay ahtaj VfipTOva11ve IsoPofe conical sleeve decouplers p end ffer mti nrdesign advantages. Alt l l mtenna Sld tlW maximum gain attainable for their respective J c jyffi'angle of radiation. Exceptional decoupling results QLroWnuning Jl a significant reduction in TVI potential. Cones offer efficiency over obsolete radials which...

Bobtail Curtain

Bobtail Curtain

wherein this author turns two previous articles upside down Fig. 1. The Upside-dow n Bobtail curtain. Direction of radiation is broadside. The radials are each one-quarter wavelength long and spaced 90 Fig. 1. The Upside-dow n Bobtail curtain. Direction of radiation is broadside. The radials are each one-quarter wavelength long and spaced 90 WOOflCl STAMQOFFS H E T1' SEPAHATE fthT hiH A F QI HOUSE TO CLE O0F IkSift- 00 tL i S TO PVt fOP SUPPfcPT IkSift- 00 tL i S TO PVt fOP SUPPfcPT fig. 2....

Icro Computer Books From

Datong Clipper

SOME OF THE BEST FROM KILOBAUD MICROCOMPUTING BK7311 A collection of the best articles that have recently appeared in Kilobaud MICROCOMPUTING. Included is material on the TRS-flO and PET systems, CF M, the amp Q80m amp 5iZffl chips, the ASR-33 terminal. Data base management, word processing, text editors and file structures are covered too. Programming techniques and hardcore hardware construction projects for modems, high speed cassette interfaces and TVTs are also included in this large...

Loop

WA3AJR 4006 Winlee Road Randaitstown MD 21133 It seems as though every July have covered the topic of computer-based, or assisted, RTTY. Not wanting to trample on any traditions, this month wiH be no exception. Most longtime readers are aware that my preference in computer systems is the 6800, While this stems from my years of experienced in owning and programming one. it is boosted by the many letters 1 receive from other 6800 owners who en joy the ease with which such a...

Mfj

139.95 buys you one of the world's finest 300 watt antenna tuners with features that only MFJ offers, like . . . dummy load, SWR, forward, reflected watt meter, antenna switch, baiun. Matches everything from 1.8 thru 30 MHz coax, random wires, balanced lines. MFJ's Best Versa Tuner II . . Built-in SWRfWattmeter, dummy loadt antenna switch. This is MFJ's best Versa Tuner II. And one oi the world's finest 300 watt RF output tuners. The MFJ-949B Deluxe Versa Tuner If gives you a combination of...

L

Schemai c of companion receiver Hg, 2. Optional audio filter. 34 73 Magazine July, 1981 part number 272-801 that contains a large number of this denotes a capacitor that doesn't change value with temperature. I found m several packs that the values needed existed with the NPO designation. If the values given in the parts list do not exist in the packet you purchase, use the parallel- and serial-capacitance formulas to obtain the needed capacitance For parallel capacitors Cj Ci C2 . For...

Mast Not Supplied

Mark Oman WAQRBR 528 Deines Court Ft Col tins CO 80525 he Fun-Mitter 5-Watt transmitter The Fun-Mitter A Goof-Proof Rf Project ' 73 Magazine, February, 1981 confirmed my ideas about hams and home-brew. Hams are, in deed, anxious to build their gear if they can be sure of success once they have done the building Judging from the response, the run-Mitter provides the amateur with the kind of gear that interests the first-time and the short-of-time homebrew enthusiasts. Goof-proof projects also...