Radio Amateur 10-1976

6aq5 Transmitter

The TV-502 transverter puts you on 2-melers the easy way. Simply plug it in to the TS-320 ior TS-520J and you're On the air Operates in the 144,0-145.7 MHz frequency range wiin a 145 0-146 0 MHz option Si Dunn K5JRN 3607 Binkiey Dallas TX 75205 ostal iLi can do funny things to a ham. Recently, I recalled the one tube transmitter that first got me on the air as a Novice hack in 1957. And before I knew it, i was doodling a schematic and looking through my junk box My first 6AQ5 oscillator was...

Becomes The Perfect Rig For The Novice And Technician Class

Ask any of the thousands of owners about its dependability, look at its features and specifications .and the reasons for its unparal-led popularity will be obvious. FREQUENCY RANGE All amateur bands 80 through 10 meters. MODES OF OPERATION SSB upper and lower sideband, CWand AM. SOLID STATE VFO Very stable Colpitis circuit RECEIVER OFFSET TUNING (CLARIFIER) Provides 5 khz. variation of receiver tuning when switched ON. FREQUENCY STABILITY Less than 100 cycles alter warm-up, andlessthan J00...

Vehicle Wound

DfltLl AN0 TAP FOR S 12 5CP -OLI- TFAiLt - on EOU ' ALE J i 5 lt A.AT vfc 5-paCE 11 to J t ji - HSUl HG DASHER trimmers cannot be located, start out with a fixed 820 pi silver mica. It is very possible the 820 ph will give an swr ol IJ I or less. With the assembly installed on the vehicle as in Fig, 12, connect the antenna noise bridge in the line and look for the resonant point on both bands. Using the braid-covered bike whips, each 50 long, will piacc the antenna quite low on both bands....

Microcomputer

1976 Ham Radios

TO ORDER, CHECK DESIRED ITEMS FROM THE FOLLOWING LIST Viria* Nov theory t*> < 513951 Ctwt E WPM S3 > I 6WPW 'S3 95 14 WPM 1S3 95 21 WPThI S3 95' Ali four fof St 3 95 umpi' Wickln - -XKR 'STOOOr 71 i.ncfeTi SE.tXJ M HarKb004 S5 95 71 OfWi e Ani nn Si 95 71 V T7PC l y eam Anienriiif 7*5 HF JTO D-flrtal Terr ELfui m itt S5 95 t RTT v HBocniDoN -SSTV H4ntfbtK > ' Sotr ff (WJ IS7 00I lljv gl kkl i Novk* S4 95 Omni - S5 95 1 Aiiv-vr> cBd S3.95 o Em 4 95 Wh Tf Oq vog Hn tleuiin T r i...

Lambda Diode Circuits

Transistor Lambda Diode

777 5 s j top view showing how two complementary transistors are connected to form a Lambda Diode. JFETs from Radio Shack 276-112 were used in this instance, although a 2N4360 or simitar could be used for the p-channel and a 2N3819 or similar could be used for the n-channeL region on the characteristic curve of the device that makes it possible to achieve amplication, pulse generation, and rf oncrgv generation. While the funnel Diode held great promise when it was firsl introduced, it seems to...

Bereaoh Sept

The '76 Cleveland Hamfest presented by the Cleveland Hamfesi Association will be held Saturday, September 11 at 8 am to 6 pm at thi-Cuyahoga County Fairgrounds, Berea, Ohio. Eastland Rodd entrance only 10 Counry Fairgrounds with easy access from Hopkins Airport, Interstate I 7T, I 90 or Ohio Turnpike, Tickets ST50 before August 33. S2 00 at 0800 for all 12 or over when gates open. Asphalt t uari lea market parking Si aricJittonal per space at 0700. Bring your own tables and shade. Registrator*...

Cartg Worldwide Rtty

DX CONTEST Starts 0200 GMT Saturday, October 2 Ends 0200 GMT Monday, October 4 Not mure than 30 hours of Oper .it ion are permitted, IN On'Operating periods can be taken at any time during the contest, but a summary of times on off must be submitted with scores. Use all amateur bands 80 to 10 meters. The ARRL country list wilt be used for country status, with KL7r KHB. and VO being considered separate countries. Classifications include single operator single trans miner , mu'r lt operator...

Logic Probe

Now A Digital Logic Probe kit at a realistic price. Red, Green, and Yetlow light emitting diodes signal the presence of logic levels encountered in digital circuitry. Utilization of transistor and integrated circuit switching techniques permit the DlGAPEAKEA to indicate logic logic Gr ,ind puJsmg circuit conditions Complete k i nci jdirtR easy instructions is a-a i Fable now from P O BOX 341 Havre de Grace. Md 2107S

Sense Voltage

This circuit wiff indicate a power failure on a bus between S to 20 volts. As long as this vol luge is maintained, only the green LED wi J he on. it the power fails and is later restored, the green LED wit turn off and the red LED wiff remain on until the reset button is pressed. There arc many applications for a simple oscillator of This type, from QRP transceivers to tlip oscillators, signal generators, antenna leslin devices, radio control applications and...

Upgrade Youp Repeater With A Rf Technology Duplexer

ALL DUPLEXERS AND CAVITIES ARE TEMPERATURE COMPENSATED WITH (NVAR AND MEET ALL COMMERCIAL STANDARDS ONLY TOP QUALITY MATERIALS GO INTO OUR PRODUCTS. BOTH KITS & ASSEMBLED DUPLEXERS AND CAVITIES ARE AVAILABLE TO YOU AT A SAVINGS TO YOU, Mod. 62-3 6 cav*. 2 mtr., insertion loss 0 6 db with isolation 100 db typical pwr. 350 w. Kit 349 ea -Assembled 439. Mod. 4220-3. .4 cav. 220 MHz insertion loss 0.6 db with 80 db isolation typical pwr. 350 w. Kit 249 ea, - Assembled 329, Mod, 4440-3, 4 cav....

Or Go All The Way With The Bestthe

Ever tried 2 meter SSB or CW How about the OSCAR satellite Tune the band with a VFO instead of fixed channel crystals and experience DX-ing on VHF. In fact, there's a VHF QSO party coming up on September 11 thru 13, FMers improve your scores . beginners try it for the firs time. You don't need a big antenna to do it either anything from a coat hanger to The OSCAR satellites (6 & 7) are waiting for you too Or go exotic with meteor scatter or tropospheric ducting, The Sky is the limit on VHF...

Hy Gain Model 3750 Service Manual

Hygain 3750

If you are PLANNING TO PURCHASE A NEW TRANSCEIVER, why not GET THE BEST You should give serious consideration to the new Hy-Gain 3750 Transceiver. With it you can expect superioi performance that will surpass the demands of even the most experienced amateur. The advantages of the new 3750 are many. For starters, more operating frequencies to choose from means more operating fun for the serious radio amateur. With 160 meters fast becoming the favorite of more operators each day, the addition of...

Boston Ma Sept

This year's big New England ARRL Convention Has moved back to Boston and will be held September 10, 71 and 12 at The Staller Helton Hotel. Fsaiiur ing a bicentennial theme, the convcn tion will cater to the whole ham family, with many committee wives in authentic period costumes helping direct the doiens of special bicerv lennial events featured in Boston for 1976. The city i extending the wel come nut with special features and exhibits that can only be seen during 976. Friday' activ tie* are...

Custom Transformers

HEAVY DUTY REPLACEMENT TRANSFORMERS* ETO A-77D Plate Transformer Henry 2K Plate Transformer . . Henry 2K-4 Plate Heath Marauder HX-10 Transformer 75.00 *AiJ Heavy Duty Replacement Tran sfor m er s are posi t ivel y guaranteed to run cooler and last longer tfran the original units.

East Alonora Garden A Oa

What makes the TS-820 the Pacesetter Full 160-10 band coverage, QRM-killing IF shift, true R.F speech processor, husky AC power supply, state-of-the-art PLL VFO system, rugged final amplifier, RF negative feedback circuit . . , all this and more built in to make the TS-820 the Pacesetter that it is. We haven't forgotten the other standard Kenwood features either . . , efficient noise blanker, 25 kHz calibrator, bunt-in speaker. CW Sidetone and semi-break-in circuits. Let's take a closer look at...

Biasvolts

Typical chanu terjstics of a Tunnti Diode, showing the negative resistance region of the voltage current curve. designers 01 maybe the device was not suited for the application at hand. But for whatever the reasons ma have been, we have turned to other devices, such as the FE T, for oscillator circuits and othen high frequency applications* just recently, a new circuit device has been developed that behaves like a Tunnel Diode, but has all of the advantages of field-effect transistors....

Millen 75012 Phase Shift Network

MODEL 375 PROTAX 1 M 6-position coaxial switch, rear contacts 18.50 MODEL 376 same as above, with side connectors 13.50 MODEL 425 TVI Filter, 1000 MODEL 350 2Q4 Audio Phase Shift Network 15.00 MODEL CC50 Dipofe Antenna center coaxial connector 8,25 Johnson style 229-203, 28 92200 2kW Antenna Tuner ST 99 mH S32.00 92201 300W Antenna Tuner SI 38 90652 Solid State Grid Dip Osc Si38

Worked All Mass Counties Award

Submissions must include a log lifting dales, stations worked, mcnta and frequency. No QSL cards re quired* All QSOs vabd including con I acts through repeater stations Station worked must be operating from county claimed, Lon must be signed by another amateur certifyinrj that the applicant has made the contacts claimed. Awards will be issued for a single band or mode if requested. A self-addressed stamped envelope must be encfosed for the return of the award. Submit logs to WR1 ACT, South...

Alarm Clock Kit Sjx Digit

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. So. here it is 1 Mostek 5 0252 Alarm Cfock Chip 6 Hewlett Packard .30 in. common cathode readouts 15 NPN Driver Transistors 2 Slide Switches for aiarm set and enable 1 Filter Cap 4 IN40Q2 Rectifiers 1 IN914 Diode i .01 Disc Cap 15 Resistors 1 Speaker for alarm PCB 3,00 1...

Frequency Detector for Your Counter

- - sounds alarm when set frequency occurs Now that you have spent a small lortune on LED readouts, ICs, and assorted goodies, and counties* hours to build that frequency counter, it is time to create another valuable addition for that basic tool. What wc are about to describe is an inexpensive devicc that will delect any frequency thai your counter ts abie to display and activate an alarm of your choicc (horn, gong, ctu.). Even it the selected frequency occurs for only a fraction of a second,...

To Err Is Human

Regarding my article in the July. 1976, issue of 73, Perfect OV -dfive 'em crazy with the Keycoder I In the Parts List, I neglected to give the part number of the recommended Amidon Associates' torotds. It is FT 50-75 (price 654 each . These are the territe not powdered iron , high permeability cores needed for this project some others we tried didn't work. Also, in the schematic R9 (Ik), that feeds pin 2 oi F F 7, should be connected to +5 V dc, and the Vcc connection to IC2 (the monitor)...

Let X B Let Zs Bs

1976 Ham Radios

You cannot mix types. 100 LET X Z is illegal. IF and GOTO. Modifying the sequence of your program can be accomplished through the use of the IF and GOTO statements. You can use IF to test the value of a variable, or to see if it is equal to, greater than, or less than another variable, or an expression. Depending on lhe outcome of the test, youi can skip to a not her statement in the program. The symbol for equal to is Greater than is> , less than is < t and not equal to is < > . So if...

Graphic Symbol

Fig. 2. lhe Lambda Diode is a two terminal device consisting of a pair of t omplementary depletion-mode junction-field-effect transistors connected as shown. Fig. 4. Like the Tunnel Diode Lambda Diode displays a negative resistance characteristic when its bias voltage is increased past the peak shown on the graphf Fig. 5. The Lambda Diode makes an excellent electronic fuse when it is used to supply bias to the transistor it is protecting. An increase in current will cause the voltage drop...

Sensing Element

Will Und application in products such as digital clocks, security systems, and computer operations* Basically, two transistor drivers are connected to LED indicators, with one transistoi biased b the Lambda Diode. Under normal operating conditions, the diode is off, keeping transistor 1 turned off. Under these conditions, only transistor 2 is on, with the green LIED indicating a power unM condition. When a power failure occurs, of course, both LEDs will be off for the duration of the power...

The Solution Box From Polymorphic Systems

Applications include smart terminals, data acquisition systems, games, accounting, front-end tor a larger computer-anywhere a little processing is required. COMPLETE SYSTEM EXCEPT FOR MONITOR AND ASCII KEYBOARD S575.00 KIT, DELIVERY 60 DAYS - SERIAL I O AND CASSETTE OPTIONS AVAILABLE. 930 DATA 28,6, 21.37, 14.28, 7.25, 3.95, 146.79 Then, to read each item of data, use the READ statement. Each time READ is executed you get the next item in the list.

Servjjvg The Industry Since

Model Input Output Typical Frequency Price 702 10W-20W 50W-9 W lOWin 70Wout 143-149MHZ S133.00 702B tW- 5W 60W-80W 1Win 70Wout 143-149MHi J16S.0O 1324 W. iJSTH ST. GAR0ENA. CA 90247 .f2T3> S3B. pfl 14 Cv *> A.C, Simmonds 4 Sens Ltd., 285 Y Oct fond Blvd., I lo-dole, Onl roM2J ISA F p rt EMEC inc., 2350 Sourfi 30th A , HallordDi*, Fl0, 330C9 Solid State Construction Linear Switch (FM SSB) Broad Band No* get TPL COMMUNICATIONS quality and reliability at an economy prtce. The solid state...

Rldrake Company

540 Richard St., Miamisburg, Ohio 45342 Phone 513 866-2421 Telex 288 017 - - nifty solid state ac relay gadget and on with a transistor, but whai do you use to switch ac A relay would work, hut this is bulky, and consumes power to perform its work. An SCR would work, cxcept that it can onfy conduct for about half the applied sine wave, resulting in half voltage being applied to the load. Or you could use two SCRSt connected back to back. However, this configuration is already available in one...

Dealer Inquiries Invited

Now ynu can synthesi e almost any 2JVI Transceiver on the market1 There's no need to iiarte-in your preseni crystal-controlled rig. The SC1800M is the ONLY synthesis to use CMOS Logic Power Miser circuity which produces an unbelievably low currem drain of only 45 mA1 Not 500 900 mA as with ihe competition' (Important when used with a battery powered rig J It's compact tool Only 1,4X6X9 (Makes possible ihe FIRST SYNTHESIZED PORTABLE Spec Comm 560 512 or, Drake or Kenwood.) So, why use it hulk v,...

Eliminate Interference To Tv Sets With Ameco High And Low Pass Filters

The AjiiLO low pern fiJrer iuppjeive* e 'ocfiohor of oil ipjriou) i-l '-.L'i JO Mt M designed for CotJ of cob'e 153 io 72 ohiruL Oilier leoiufti include Negligible Inseriiort Loss, 35 tib ciricJ ijioh dHenuation o La-monk ond spurious Iraquertties cbow- 30 MC , will handle up to 200 of ftF Mode HP J5 it p > vtcuoi h ,jh-ptm filter. A frequent tfi above ib mc am pesied through w.thout lo i OHitrt Jeoiurei include 0 db ond mure Qtienjo- ian pr 14 MC ond below. 70 db otifimjotfDn uf 10 metert...

Electronics

* All K intl manual switching i tl3 f 1111 j Mr Hi. 15 4li j nil 7S IU'IL'I IndnJes t * ah mi> fcjI co I ml > i iottl hip lor ffctian i- Vitenn.1 HonJ.s thi* World t,rrr i'o ii amatrur radifi products from Swan l led rein ics. Anioiig the mast respected of these are the uniQue singtr-sideband rifijf with that special something' extra like those illustrated here. sv A*i SPv-300. Iruosntivm Fully Hiitld Htaifl, umciaabroiuL h j i l 1111 tuning on nil flVt1 bftndit inii iijI'iijjif vsWit...

Antenna Switch

Comro unit aOtK* on HQ 22Q h -' 50 60 Hz arid supplies necessary DC Id motor E ceir nt for single coa* feed to it iititiafni uads o v . s of rninoaa- deit Tne five positions allow i sxngle coax 'oft to tfcreo Df i ns and two OjpoteS. O other simtfar comtarnaltons Control cable (nol supplied) 5 imi1 ,i. for HAM-M rotator. Selects arilennai remotely grounds all unused anie-nnns GND posilion grounds ail sr*-tenraa hen ie.wmcj tai< cr Rain-Hal construction shields matof and switches Mole 2* VAC 2...

The First And Still

ui.-tk durminl mo* < ji - - * fiiv r 'i'L'n i rif-, j-k. t.- ir < i li n Dc inil h 1 . H. Ii- * iHMp 1 ' j lt.,i.' lulu i f ' plj-'MriL'v hludijLii CdrmHucIidfI .v < 1 i i- I In- U tfra - in .-i - i J i - i i- -H . i 1 V Air r Ji + J I m 111111 ' .' u i j i1 - n 11 tfm * iujMt Hal Rfcpnr ih h * i' m rf v In, lllin n i' r- r - -.-.i-. - .-.,- - Mil nil -plm l*r I nwfi ll A Sf njl Wtt Hhi It Ob The IC 30' S0 Merchandise Credit With H-tn h IC 130

Kr Electronic Keyer

A i f.mpi i-iy automatic H irctronid kryer fully adjusuliii.' ro yriLir operating .lylc arid pref iunce, peed4 touch Lr,fI weighting Thr ot the length of dus antf dahi .j> aci Own. Sen con trolled Hceye* to Ifinsmii your ihougtiTi clear ly. a licu- Idtelv - lcJ almost effortlessly. The lafnluc (stjutujjp fedujrn allows ihe insmitm fit flits and dah v ifh f> erffii 1 hum no An j-.itoriidT weighting syKlrm pcoviiiw increased characT ' io spRce ratio at slower speeds decreasing as i he sfHttct...

Half A Computer

Most of itie ads tor computers are written for knowledgeable computer certain lack of candidness as iar as die software involved Is concerned. New comers nuiy be vaguely aware that software is fteeded for computers but not really understand just haw important it is . particularly for the neophyte to have some sort of operating system available Like several thousand others, I read the early MITS ads and envisioned myself sitting down to .1 small com puter system (golly, the board is only 4 5 in...

In Performance

There is simply no better processor available for general purpose computer work than the Motorola MC6800* This memory oriented processor is easier to program and makes possible more efficient, shorter and faster running programs than the old fashioned bus oriented processors. Have you been convinced that machine language, or assembler programs are only for the experts Well not with a modern 6800 based computer. Anyone can tearn very quickly with this simple straight'...

National Multiplex Corporation

3474 Rand Avenue, Box 288 South Plainfield, New Jersey 07080 . , . Data Recorder CC 7 3 gt 149.95 Please enclose 2,00 . , . Data Recorder CC7A 169.95 on each Recorder Operating amp Technical Manual Schematics includes Software amp Hookups for 3080, 6800, and I O. 2,00 Cash Chuck PB nkA ricard ggjg Charge

Editorial By Wayne Green

Bams comr up here to fantastic Mew Hampshire lo join us. If you read Atewsvwekt you know i ha I New Hampshire has one of (lie lowest tB* rams in he country, yet provides very good services for the people. It has one of the lowest accident rates in the country on its fOjds. This despite ih large influv of visitors who come- to New Hampshire on vacation r . . four reasons of the year. We have large vacation crowds in summer when it is cool and beautiful, We have them in the spring when it is...

Tvpscjl Test Socket

Overload by a fuse or current limited output because of a TTL short or human error. Phone tip jacks are used for test points, with external test connections being made by scope adjusted as in FigT 5a. Use an educated guess or flip a coin to choose a TP that would ordinarily be ground, such as TP4 or TP7, Say, for example, that we choose TP7.

Goto Location

NOTE THE PRODUCT CURRENT VOLTAGE IS FORMED BY ADDING CUBRENT TO TSELF VOLTAGE TIMES, FOR EXAMPLE, IF THE VOLTAGE IS 5 AND THE CURRENT IS 3, THE PRODUCT CURRENT * VOLTAGE 3+3 3-3- 3 - 15 NOTE THE RESULT iS RETURNED TOTHE MAIN PROGRAM IN THE A REGISTER of storage local ions in the data area of the program (locations 0200 - 0209). NOTE The values used in this program arc decimal. In reality, the values stored in memory would be in hexadecimal or octal. A conversion routine and an output routine...

N Street Mesa Az

Are the same as LM501* but with rirtfi ana porter . .t-ci, These are factory prime overruns, -i are available in mf ltiip or TO-99 stylo cases pleaso specify wnfcm case 5tyle yog an , these are super fast diodes REVERSE R viBr TIHE tot PTCOsecondsi. USE FOR VHf PURPOSE rtC5D SH AVD -JHOLE A BOOT St VIA *

Transformers

Sort of 3 nice ftoJd t p1 or, too, 5A.VE AS 21Q2 ITPE ftA S, BUT FULL COW.ERCTAL TEv-P RANGE C0-55*C3. LOVER P0W 3 (17 ma TYPICALLY), AND FAST** ftt50 HS WORST guara t'egf ). a super 21g2 + lists for over 141 ue have a limited supply of sprague pokreft l y tic capacitors- despite the hufie amount of capacitance, size is only 3 vlb by 4 3 lt if you have ft rtlcrocodputep uitn a farad deficiency, thli is the rwic < *on build ft beefy power supply around it * wvctookcv .v. . . . . .'....

For X To Print X Next X

FOR tn this example sets X equal to 1, Then control drops through to the PRINT and the NEXT. NEXT adds 1 to X, If X 20, then control falls through to statement 1 30 otherwise it goes back to 110. In this example, statement TOO is done 20 times, each time with X being incremented. You can set X to any beginning or ending value (well, almost any value). If you want some number other than I to be added to X each time the NEXT is encountered, add the word STEP and the number added to X- So, to set...

Teletype Code Conversion Chip

VU5220 amp 1 can .-m 5 1 wl s. d t s e ni ASCn, Lie I - i . chip to mnkr rtjui ltd M rolt. tfl your rtflfl CDfnpu r, 11 a.00 speci far I he lAajn, , ,30 Only T X 1.5. rYpvf 5 TO TS VDC, tw p 60HZ J,auorii ave f porfnhle nr rnoiiile ek . PC boar'J s drilled i mtbk-60hz b8 70HO5 Vol hog ragjlafur. Falrchild 5V, 5A, TO-3 regulate . Tnitc care of ihcqe hrnjvy cmiftnfr requtm gt onti without wp'jrtire rr ju at or paa tranjij r cams if oH ans,, Lke it tti th- J e it -il i dito ' il r i rt OS h, tome...

In Quantities Of Or More

KIT INCLUDES 6 LED Redouts FND-70 .25 in. Red, com, earhode INSTRUCTIONS 1 MM531 4 Clock Chip 24 pin QUALITY COMPONENTS Switch MONEY BACK GUARANTEE 6 Capacitors ORDER KIT 850 50 or 60 Hz OPERATION 5 AN CREDIBLE VALUE 12 or 24 HR OPERATION Rrafetort 24 Mole pins for IC socket Kit 850 will furnish a compiete set of clock components as listed. The only additional items required an7 a 7-11 VAC transformer a circuit hoard and a cabinet, if desired Printed Circuit Board for kit 50 of B5G4 leiched 8-...

Great For Clock

Clo* k calendah kits White FlexiRtas Case chassis Sat Vts A-i B 'ei To lr i ' ast Contrast Of Digital OispUv-x Use Gray -Vit h Any Color Hod VYnii Red Dismays OnJy i LEO s wi 1 h Red Chassis BfiqhtestJ SEE THE WORKS Clock Kit Clear Plextglas Sund Plug iransformoi & all parrs incl, Pre cut & drilled Size 6H, 4VW, 3D

Now In Stock

Transmitting Variables Roller Inductors Countei Dials Air Wound Coils Couplings Knobs - Receiving Variables Toroids R.F Chokes CbiJ Fefrms and more Millen - 6 F. Johnson - Barker & Williamson - JW Miller - Hammarlund Add S2.00 to each order for shipping and handling. Prices subject to change, tional vehicles wilJ turn right on Mile Strip Road Ltncl turn k-fl on Route 62 South (first major interaction). Follow the signs to the Erie County Fairgrounds entrant. Ail other vehicles turn left on...

Universal Rower Supply

A unique plug-in supply by Panasonic, Useful for calculators, small radios, charging many & various small NiCad batteries- Adjustment screw plug on the side changes output voltage to 4Vi, 6, Tk, or 9 volts dc at 100 mA. Output cord with plug, 6 ft. long. SP-143C 4.50 3 12t Pie as e add shipping cost on above.

Telephone Touch Pads

New, by Chromerics, standard telephone format. Measure 214 x 3 inches. Great for repeaters, phones, computers, etc. 4.50 each 6 S25.00 THE TERMINALS WE OFFER ARE NEW AND UNUSED, IN ORIGINAL CARTONS. This display terminal has an Integra controller, B W cathode ray tube and keyboard. The system has a serial I O interface for communication and an I O interface for a printer. These units employ standard Motorola RTL Technology. DISPLAY (P N 4802-1095-501) FEATURES Characters are generated by a...

Vou R Choice Of An V

100' S OF BARRELS PURCHASED TEST EM YOURSCLF N SAV For th fkit time jny> rh*r*. Poly Ptfc miirtliandli fi introduce * new way In buying the e h mkil w y. Raw Cock from th* hifTHl. Hpmenifatr tho ol day*T' They'ro bMk lC4ln- Thp same way murehjindttar* throughout th* United State* buy from variout factor I . , , tfieir overrun* in burrelt, Poly Pah has don* the iUne. T Her* fur c you Mt0 g *tinK the lent* type of material at tiie HE-TESTER5 DO BARREL MIT r7 VOLUME CONTROL BONA HZ A , I1APKE L...

Ecc Industrial Speed Control

i .i I l IU > A 30 nir-i. i .,.,lr . 1'mC Islnoiu fill n drt-fr.- i I. . Ill r hi ipnd c r slir J. ' f n rriLh hoi phoy Jinil n-J- I r al jf lfti i- j. kilc it i 00 walu. a t* t rlibrrtt* UtLUt f r rr.JHfiP EliAf * M .F iLt Jid rl tni ii1 d T H . r l - . nr . - 1 l-iH L br Lh LTP* meiert, etc. bellt *iib (Jul r *JutnlouiD tram- ITTf CunpUll WH Jl tllE TIld r. OK WK, i ir .ilt l> efij i-'jtir . t n wiu r iit-.-r. Flv i * T Jttif di r*t Irrs r-r 1 K.v*r 60 i-TPl . to b r< mrollf4. 1P .-J ....

Call Your Bank Americard Or Master Charge Order In On Our Continental United States Toll

Box 28810 Dallas, Texas 75228 ORDERS OVER 15. CHOOSE 1. FREE MERCHANDISE JUNE t3 I I4LT ItViE DWQ Biizu T, an 220 C 2 T-iniCPI'n ril H-I-.T TV PE rA T lOOwrijar BC3JE . i - - 'tTflf i -ij JO T J F .1 'litI . ., 10-T -i-i-' iflT rp anvtrtioft, mottrti louttiy) coih, intT ting y . TV Ltnh the ART 36 ti TRC on Z20 --HC ij n rP > i t- AUG GX Qattvy cm 6M tin. < 3 oa* n . . thiH T p '-rrttch nl u-in tula o< ji. tw brMkifl. VEE bum d gn, com IfliV*-. HF .V TK TijLw GulOl-...

Hobby Computers

This book is for the beginner It will help gei you into world of microcomputers, a world of enormous fun (and one which all amateurs are going to to tjiii used to, like it or not). It is n complicated world rJnd you need all oi the really fundamental help you can gel . like ihis book. These are reprints from 73, gathered in one place to lie the whole wor ks together for you Don't miss out any longer on the fun oi hobby computing and the fantastic H im applications of these incredible devices....

Study Guide

1977 Edition . . . complete up to date with new material on every aspect you will encounter on the new FCC license exams. Even the new rules are included An exhaustive study of the books vail ab e to help the Novice get his General license shows that just about every book available is hopelessly out of date . . _ WHY GO TO THE TEST WITH TWO STRIKES ON YOU' This is NOT a question and answer memorization book , ,. it is a complete self-teaching course in the radio theory you need to pass the...

W Pep Digital Dial Transceiver

M 6 - Digit Readout S AU Modes - SSB CW AM FSK 160 thru 10 Meters TX & RX Clarifier a RF Feedback I 3-Position AGC Rejection Tuning (Tuneable IF Crystal Filter) Built-in DC Power Supply Optional AC Power Supply & Speaker Unit with 12 or 24 Hr Digital Clock Noise Blanker RF Speech Processor Computer Type Plug-In Module Construction I Size 11 in. (w) x 5 in. (h) x 13V2 in. (d) Light Weight 22 lbs. The Model FT-301 D is a precfsion-built, all solid-state, compact high performance transceiver...

Wayne On Warcc

YouTve rrobabJy heard about the preparations which are being mad for the coming ITU conference. Com mittees are already at work on proposals for mora ham bands . etc. Vou probably haven i heard a lot about what happened at the last ITU meetiny when Emateifl radio Lost vir tually all J99.8 J of its satellite bands That was when the biggest pan of the future of amateur radio wen* down the tubes. Just imagine what we could do with amateur satellites using the 12151300 MHz band . _ the 2300 2450...

Super Speed Cw

A small group of amateurs have been loafing along in the SO 100 wpm range with CW. You may be able lo hear them chirping away if you check 7035 and 14035 k H evenings. They're using codeiyping keyboards for sending and copying in their heads. Yes, I know that the record was set in the 40s by Ted McElroy al 73 wpmH but that was hard copy. As a matter of fact, I used To watch Ted at hamfests demonstrating his skill it was amazing to behold* The sound was almost like a continuous Tone. Ted would...

Mostly Bourbon

Just ,i ni> ie oi thanks for your buy centennial offer, i'm half Scotch, quarter EngJish and the rest is mostly botirbon I think, but a bargain of this kind cannot tie ignored, especially since 1 just borrowed a current copy at QST to hnd out what the cat left in the tuna can. Only our count 'em, 4 articles that I can even remember being in the issue VI just looked at it yesterday). rind acres of contest results and adver tising. More ads, it seems to me, than 73. and less magazine. That's...

Software Support

It s actually your excellent I '0 section that I'm subscribing for. Byte haJ not lived up to its promise, and you have the ui on and imagination evidenced by the July editorial on the future of the home computer to expand the 1 'Q suction wonderfully. Count on me to support your plan to distribute wihware. I'm in ihe market for anything entertaining that will run on my IMSAI with George Morrow's cassette board and PTGo's video board and BASIC and 20+K of RAM and still growing. in the meantime,...

Pvc Fpf

Preparation of PVC tec for top whips* mounting the two whips (see Fig. 7). It is important that these holes are absolutely parallel to both the sides and ends of the tee. A drill press is a big help here but it can be done with a hand drill if both sides are very accurately marked and caution is used while drilling. Don't let the drill or the tee wobble and make the holes egg-shaped because this will affect the proper installation of the whips. Of course where I drill a large number at...

Special Prices Good Thru Sept

Alexander MacLean WA2SUT NNNQZVB 13 ind dJi Spring Tra i Denville NJ 07834 The 7400 gate is the workhorse oscillator IC There appear to be more circuits using ihis one IC than any other. Il would seem ihe logical one to begin with. Its full name s quadruple two input NAND gate, As many of the ads wilt just list it as 7400 gate, let's leave it at that. You may also see it as SN7400N or something similar. The basic thing to look for is the number 7400. This identifies it as the 7400 series of...

Mx Tals H

P 3M4 LEATHER CASf S1 M AT 9flUB6EH Nf AND WHIR J6 C1 H CA > S S30 O WITH FULLY REGULATED AND PROTECTED AC PS S2S9 13 505 2m FM Xcvr 30w. I2ch w 16 76, 34 94r 94 94, fflic & ml, (Reg. SALE 229 NEW R hn 50' Fold r ver Toners (Reg 5 5)S369 70 Foido er T weis (Reg U2S 589. Sfrpp'n Paid on Ail Tpwe ATLAS. COLLINS RtGENC DENTRON SRI MS TONE. GUSH RAFT 0 RD standard KLM HVGAiN KENWOOD TFWPO. MINI PROOUiCTS. MIDLAND. VHF MARINE. ETC,-PLEASE WRITE FOR QUOTE PLEASE WRITE FOR SPECIAL BONUS m. PA( m...

Regulated Dual Protected Power Supplies

Trin cnl Responsp j uSec Cutrent Limii Y Amp C nt tf i dbaci (ASt (n . T WkiS d M G-T g Jib , Ufi Pi CE S- 00 f j em Qjf& ur CtirrfFTt fiffLcibacfc Over Voitaje ana Ov f Ttirtperiiure Prmecred SIZE m i j wj ii'j .d. WElCHf 1 a lbs. OURf'HlCF Jj UO AFI power supplies feature short circuit, current overload, aver voltage and thermal overload protection circuitry, OUR CRE w CAL SMITH-WAA Li, M r f G0tr

Aluminum Se Hons

The design, con-si ruction and adjustment had to be within the capabilities of any simply equipped station. In operation I have noticed the specific characteristics of the antenna. There is an excellent front-to-side ratio, of an average 30 or more dB in attenuation. This has been verified in reception and transmission, The front-to-back is more difficult lo determine. The farther away the other QTH, the more noted is the directional attenuation. Averages range from 12 to as much as 20 dB. When...

Introduces The Versatil

More Channels at the flip of a switch Unlock the unique mode switch and 12 channels become 144 .25 mV Sensitivity plus 75 db adjacent channel selectivity and 70 db image rejection 35 watts nominal with a minimum of 30 watts across the band 7707 Records Street Indianapolis, Indiana 46226