Ec

Fig, 2-26, Capacitor discharge circuit, Sweep circuits all have some kind of a capacitor circuit that is charged at a more or less constant current The simple circuit in Fig. 2-26 shows the principle. Without the presence of the sync pulse, the transistor is in a non-conductive state. Capacitor C is charged from the positive supply voltage through resistor R. The charge of voltage across a capacitor is given We know that a sawtooth voltage means equal changes of voltage with equal changes of...

Kdk

State-of-the-Art Equipment of the Seventies. Now greater Quality and Reliability than ever before. Featuring the new Giant from Eimac, the 8877 air-cooled grounded-grid triode, with a conservative 1500 watts of plate dissipation. Volume production now allows a new factory-direct-dealer price CR-1200 Single VFO Receiver 1095 CR-1500 Dual VFO Receiver . .S1650 Extremely reliable, trouble-free operation is the basis of our new Alpha Warranty 12 months on all parts & labor, tube warranty by...

Gregor Y Electronics Corp

J. 07662 Before you buy or trade anywhere get our deal AH the hams at THE HAM SHACK pJedge prompt, personal service. Well plan a package deal on a whole station from Mike or Key to Antenna. Our trading shoes are always on - try us. You'll be glad you did, BUI - WB4JFK Hy gain Power-Full GALAXY transceiver

In Stock With Your Local Dealer

H. 03103 MODEL 6100 . WIRED TESTED READY TO USE Solid State Antenna Switch (no relays) Employs ruggedized transistors for maximum reliability Extra large heat sink for operation under severe conditions Complete with RF and DC cables California residents add 5 sales tax. JM Communications 101 Vi Washington St. More and more people are signing up for the ten day cruise of the Caribbean starting April 3rd - it will be a blast. The prices start at about 300 per...

Each J

Original government cost over 510,000.00 One of Navy's most modern radio receiving sets. Built by National Radio Co. in last decade. A triple conversion su per heterodyne. Frequency range 2 to 32 MC. continuously, or in 1 kc increments. 4 bands. Featuring full carrier suppression, unit receives AM, CW, MCW, voice, facsimile, Teletype and ISB. RE QUIRES NO MODIFICATION Greatly superior to earlier R390A URR model. Good cond. Complete, operational. Spec sheet available. Spare parts as needed....

R

The builder of more complex equipment is often faced with a choice of three evils, whether to meter all circuits which should be metered with individual meters, with a single switched meter or forget the whole thing and trust the equipment to perform in a satisfactory manner after initial adjustment Individual metering is rather expensive and space-consuming and must in most instances be confined to price is no object projects. Obviously, lack of metering is an invitation to trouble, expense,...

Philcoford Dynamic Mike

Replacement for tape recorders, PA syatem j audio limps. 200 ohm , 6-it, cord u.nd mini mike plutf. 200-5 00 Hz, Wt. fi Fits in paim of hand. 2s a i 1 Va x Impact pluutlc For Clasii AB ua.fi. Btiaic include hi Sljtnetle fy4 0 3 0 transistor hijfh power driver TO-5 J4C' wiih a pair of complimentary watt pi is tic tranrtiiiUirs. i.o, Nf< Zifrt ii n iuid 2N61U9 pnp. With .iL liemtittc flH printed circuit dud jmrta buuitd Utyoula, MAN-4 equal, (shinny MAN ly SpAci am a& MAN-1 type 0-y plut*...

Digital Panel Meters

A new line of digital panel meters are available from Weston Jnstru* ments. The series 1220 draws only 3 4W of power from a 6V source-They come in five voltage ranges from 0-100 mV to 0-1000V and five current ranges from 0 10 A to 0-100 mA. Accuracy is claimed to be 0.1 of the displayed amount-Readout fs accomplished by the use of pJugin LED display units and provi sion is made to incorporate a push-to-read circuit for battery conservation. Although these meters are relatively expensive for...

Electrotec Corp

East Haddam, CT 06423 Telephone (203) 873-8643 example, a correction of one unit reduces the drift from 0.5 to 0,4 seconds per week, then four units of correction in the same direction should put the oscillator right on. I used u vernier control giving 100 divisions for 1 2 turn of the trimmer capacitor, and about a five-to-one speed reduction from the knob. The oscillator is tied to the clock through a divider chain, as shown in the time base clock diagram, Fig. 3. The purpose of...

Adjustable Printed Card

F or Rack Mount 5 to 71A - 16 slides and sockets - includes 30 double contact position edge connector type MODULE TYPE POWER SUPPLY TRANSISTOR, REGULATED. 1 15V - 60 cycle in + 12 - 6V 3 amp output. Front Panel adj + or 10 . Onoff switch. Fuses, Barrier strip output. 6 x 5 x 7. Excellent, Cond, R 11A LOW FR Qk RECEIVER 190 550 KC SHIP. WTt 8 PRICE 4.95 or 2 S8.00 282 D GR tr*nt. fr q. 225-400 mc. SHiP. WT 150 PRICE 39 90 Pane* mount 3 8 shaft 115V- 60 cycle -0- MOV out, Above Variac with 9 RPM...

Broadband Preamp

1 -30 MHz, 36 dB gain dropping to 19 dB at 30 MHz, 3 dB Max, N.F., 12V dc, metal case with mounting lugs, 2 x 134 x 3 4. 90-day guarantee, Sh. wt, 6 oz 1 7.95 Data Engineering, inc. sss4 port Royai Road Ravensworth Industrial Park, Springfield VA 22 51 Joseph F, Dmeen YJ1JSS 9 Win ter Terrace West wood MA 02090

Go all the way into the

There's nothing half-way about the new Hy-Gain REPEATER LINE. Designed for the man who demands professional standards in 2 meter mobile equipment, the REPEATER LINE is the 2 meter HAM's dream come true. It's got everything you need for top performance toughness, efficiency and the muscle to gain access to distant repeaters with ease. Reaches more stations, fixed or mobile, direct, without a repeater. The right antennas for the new FM transceivers or any 2 meter mobile rig. Rugged, high riding...

Get The Bird From Hamtronics

We have a complete stock of ali Bird wattmeters and slugs on bond * , * immediate delivery, Order a new BIRD Ham-mate wattmeter for only 79, but please specify if you want the 200 1000 watt model or the 200 2000 watt model Come to HAMTRONICS and see the largest stock of new and used ham gear

Now meet the rest of the best

A few short years agoT Signal One introduced the solid-state CX7-A, It was quickly recognized as the world's most advanced radio transceiver. It still is. Now, Signal One is more than just the CX7-A. A lot more. For openers, we've added two new receivers. One theCR-ISOO, a dual-channel system is so advanced in selectivity, sensitivity and versatility you won't find anything like it this side of a research laboratory. The CR-1200 receiver, our other new one, features a single VFO. If it weren't...

Info

Mitter keyed full power, the transmitter would be looking into not 53H, but 3.5fi. which is a lot of difference, and an extremely low value for any pi network (o match. For a few seconds, until the filament attained full brilliance, the transmitter would be subjected to a terrific overload, due to this impedance mismatch. Therefore the first precaution which might be emphasized in using light bulbs would be not to key the transmitter at full power with a cold bulb, but to gradually bring the...

Hamfest Muskegon Michiganmarch

Old fashioned ham-hospitafity at the Ramada Inn & Wouf Hong initiation Friday 23rd Saturday 24th at the Muskegon Community College - Exhibits Swap Shop Tech Sessions Net Meetings. Evening Dinner & dancing at the Ramada Inn, Info WA8GVKc o MUSKEGON AREA AMATEUR RADIO COUNCIL BOX 691 MUSKEGON, MICH, 49443 1 1 ratio for dipole or inverted Vee. Replaces center insulator. Cuts noise in receive. Cuts TVI in transmit Wideband t.7 to 30 MHz. Fuil Kw power. Stainless hardware. Sealed....

No Traps No Coils No Stubs No Capacitors

Fully Air rpsfed Thousands Already in Usp 16 40 Copper Weld wsre annealed so it handles hke soft tapper wire Rated for better than full legal power AM CW or SSB Coanal or Balanced 50 to 75 ohm feed line VSWR under 1 5 to I at most heights Stainless Steel hardware Drop Proof Insulators Terrific Performance No coils or traps to break down or change under weather conditions Completely Assembled leady to put up Guaranteed year ONE DESIGN DOES IT ALL 75 1QHD ONLY 12 00 A PAND' ModeJ 75 J0HD S60 00...

Plastic Fiber Optics P

Iic optical monotibers areconve nientiy c rd mounted atvd vai able in five differ tint fiber d hme i' fi Exceu- nt supplement tot 6 jnd F Fibr't Optic Kit to pro vide additional(titvi optic material Fibers available in diameter of O05fz50fi. card). 01 Imi design versatility *n P& D and proriui.i engmnurs. 5p cifmflTions - rniiximiim cont opnr, temp. 1 70 degrees Fahrenheii. ecciipiance angle 67 degrees, numerical aperture 0 55. tTansmi ion rantft 0.4 to I 5 micions. YOUR CHOICE - S1 00...

Philco Am Radio Chassis

Coveri SSS Kc* to 1SOO Kc* Broaduil band Originally design -for portable ptiono systems, and tape cassettes One of the most versatile AM Kadio and multi-purpose amplifiers we have seen at Poly Pake famous ' 'Economy'h price. Measures only 4 V2 x 3 x 2 high. With tuning capacitor, IF circuitry, loopstick, ant,, volume control with swtch, AC and phono-mike jacks. Separate switch for changing from AM radio to amplifier. Uses either 110V plug-in adapter Cnot with unit) and a 9-volt battery power....

Uon

A huge selection of the best technical and construction articles that appeared in the FM Magazine between March 1968 and June 1969. 64 chapters on just about all aspects of FM. Articles on power supplies, antennas, public service, commercial equipment conversions, all about crystals, re peat er i n st a Mations, transm itter hunting, touchtone, test equipment, transistor pre amps for carbon mikes, plus many more. FM can be more fun if you know more about it. 144 pages, softbound, 4,

Vhf Contest

Worlwide VHF Activity 1973-3PM local March 10 to 10PM local March 11. Purpose To keep VHF bands active, allow rig testing, allow hams to get acquainted with fellow VHFers. Exchange call letters, county and state. Count contacts with mobiles in each county worked. Mobiles can work a station once from each county of mobile or portable operation. Let's see some mobiles. Scoring Multiply number of contacts times number of counties worked times number of states worked. Awards Certificate to each...

Part Numbers Shown Are From Schematic

But let's pause a moment and reflect. We now have IOOV dc to operate the relay The manual states that minus IOOV is needed to cut the amplifier off during receiving periods. So lei's use this minus 100V to do just that. By grounding the junction of C24, D3 and R20 this being the positive side of D3 it will ground the positive side of the supply, leaving us the negative side through the relay and load resistor R21 (o run to PL5 where the external bias was to be applied. Since we now have minus...

Hardtofind Precision Tools

Lists more than 1700 items piiera , tweezers, wire strippers, vacuum systems, relay tools, optical equipment, tool kits and cases. Also includes four pages of useful Tool Tips to aid in tooi selection. 3850 SOUTH FREEWAY, FT. WORTH TX 76110 - 817-926-5221 Now Open in Dallas 2860 Walnut Hill Lane - 214-358-4641

Electronic Preset Counter

in-, counter is Uom a copyihfl ma * chrne. Jt uses two Durant electro mechanical decade counters, and in 'J Holies a n tee oower supply, ole Two rularv twitches allow the unit ic* be preset with any number from T to 50, When rtumty.+r of puJ& es fn iear hes his CfrurttT a r ela* openi. shuitmg ott thp connoted Should be useful foi cot winders and other appi< cat> oni r . ng shut oH ai edetermtnad count Tne pa1 alone at our lei w price fpiesent a steal as the unit has n> ghaualiTv...

Order Desk

Rums H AtKll HftDS W Ml l> l TS 0 ,rT-Hhr .Kln.- i - Iri-I . rH. i, ll k Uli UV MW ,f,t msfl H Ol ItU m H.-nt,,. imirtni'T) ,Pid -i im i uii i mjk.ml ilm MniP. rr il mviiwlnp will I ' i MnjHiMiiml mul Wn- ridlonJnp HuPiAlnl F1 ailrt Iuil4b'tli I IpI I i .r yimr MH h Jn.imji- till . I ii Mini. mi-i. HijiiiI I.,i .L - 1ii-m, ni Ml Hifd-i -H lr Him M, .11.1 V -tnpipwd 111 tl.H 'l h ** If MjiI Hln iimU l.h-- - ' A 'i'L lin * ndqrd rtttfpv Iih M1 WnV lU.ifn iM M IKS HIH'K ftFJ lWN h PU'utw . ilil...

Heathkit Electronic Centers

Phoenix, 2727 W. rndian Schoor CALIF. Anaheim, 330 E. Ball fld. Er Cerrito, 600Q Potrero Ave. Los Angeles, 2309 S. Flower St. Pomon*, 155S Orange Grove Ave, N, Redwood City. 2001 Middtefield Rd. San Diego (Li Mesa), 3363 Cenier Dr. Woodland Hills, 22504 Ventura Blvd, COLO. Denver* 5940 W. 3flth Ave. CONN. Hartford (Avon), 39S WV Warn St (Rte 44) FLA. Miami (HialeahJ, J705 W. 16th Ave. CA. Atlanta, S2fiS Roswel Rd, ILL Chicago, 346i-66 Devon Ave, Downer* Grove, 224 Ogden Ave IND....

Chassis

Same as above, except, no AM radio section. Completely wired With built-in preanip, mike, phono and tape input . Color-coded wires with diagram and hookups. Works off 9VDC transistor battery. Excellent fidelity, t.'nuiue Scientific Device, iHhand claps, sensitises crystal mike amplifier, triggers SCK. Needs only 3 to 6vdc. Use as burglar alarm, intrusion device, Use with photo cellh triggers SCIi's. relays, LED's. Even iih r optbc light pipe may be used. With hand booklet. * Two SCRs in one...

Delay

The device to be described in this article uses three integrated circuits that are reliable and inexpensive, A few resistors and capacitors set the time intervals for the two Signetics 555 timers. A 7400 quad dual input nand gate performs the required logic functions. A transistor is used to drive a relay in the output circuit. The completed unit is connected between the repeater receiver COR contacts and the repeater transmitter keying line. Any available method of construction can be used...

Disc

The bandwidth was sel relatively wide to allow for frequency instability on the encoder. This allows the simplest possible encoder circuit to be used. This is a good consideration in a large group of repeater users where some members may not have the desire to buy or build an expensive, complicated encoder. The encoder uses a simple phase shift oscillator circuit. Figure I shows the schematic of the decoder. The signal must be taken directly from the discriminator of the receiver. The low pass...

E

Fig. 2-3, Use of an op-amp in summing. As was mentioned before, it is necessary to add the compensation resistor capacitor combination if a 709 is used but if a 741 is used, no compensation is necessary. hhe inverting input has other extremely interesting features. This input terminal appears to be near ground potential in its amplifying characteristics. In fact, it is called the virtual ground input. Because of this eature, this input can be used as a summing junction. Let us say that you want...

Pattern

OHIO 44142 * 6 db gain over 1 4 wave ground piane * Omnidirectional radiation pattern * SWR at resonance typically 1.1 1 * 6 MHz bandwidth for 1.5 1 or better SWR Radiator 119 x 1 OD high strength aluminum tubing Radials Four 21x dia. aluminum rod Wind load 23 lbs, at 100 mph Mounting cast aluminum flange accepts 1 American standard pipe thread mobiles and the Buck Buster, are available from all distributors who recognize the best

Umul

I Automatic vertical reset modification Those of you with W6MXV monitors might be interested in Fig. 1r a modification for automatic vertical reset (constant running sweep). The switch selects manual vertical trigger, or automatic reset. You might use Pin 12 (that pre viously unused pin) on the monitor circuit board to bring out the lead from IC 107. A simple modification to make a great monitor even better Don't forget the Slow Scan contest the 10th and 18th of this month. Hope to be...

Memories

7489 64 Bit RAM TTL 3.50 6223 Programmable ROM 8.50 MM5017 Dual 500 512 Bit RAM . 6.95 MM52GO 1024 Bit RAM 9.66 4000 Bit Core Memory Plane . . . 4,95 G 4000 Bit Core Memory Plane* . . 11.50 T rms add po& tage, cod's 25 . Rated net J0 Phon Orders Wakefield, Mass. (617) 24 Retail 211 Albion St Wakefield, Miis , C.OJ .'S MAY RE PHONED IN 15t CATALOG on fiber Optics, ,lCs1 Serres, Parts ELECTRIC 3 FOR 6,00 3-WATT AUDIO AMP .Htlivers 3. watts continuous. 10 watts 7 ak With tereo phono,, tape....

Or

7-25W bulbs in parallel (70 ) B. ) Nominal 50 to 55il impedance Loads 250W Load 4-60W bulbs in parallel 2-150W bulbs in series, both paralleled by transmitter to which such circuit were connected In the course of my preparation of this article, I discussed the ramifications with a number of interested hams. Some of them suggested I extend the research to include the use of the smaller types of indicator (pilot) bulbs as loads for testing out transmitters with power outputs in the 1W to 20W...

Uty

V'h For iarhiries. offirr t jud ammerrul ertjiljli*h' mnili, in J I h* - pwptr whd lik** larp- ditplAy*, rlwr-ictrf appt-ir j Li ill miifitmom* line *Wli ran 1 irjd from di< -Unr - j- trrji i- 150 frrl* Jl drjw ritruiti- are solid jijii*. Jtij mill envpkty* Ctt* > fll LSI dock fltip. Ittdtrilc- Iwiur. miraite& , and wi-ond*. M* br witftl ioc H how nr 12 tHiur apuilnb with mnipir jurrii r tk nfr. kri ciirml nitiiplrif t tlh < if without lor cwfum tn< 4ilij1ions Pari include P.C....

Check These Features

Speech clipping. Sensitive receiver ,25 v (max.) for 12 db Sinad. Selectivity Adjacent channel (40 KHz) down 50 db. Each crystal does triple-duty, providing a transmit and receive frequency (Crystal Saver Frequency Control). Monolithic crystal filter. Compact, rugged, attractive,

Cmbfs

Not bad, considering that the CMBFS unit costs less than 10 while the precision bridge costs over 1,000. Although Elm particular unit has a capacitance range up to 313 pF> there is no reason why a higher C L ratio can't be chosen to permit reading higher values of capacitance, that is, if you have a computer handy to give you a new set of computations. Another approach for extending the range is to keep CI at 1000 pF, but split it into two parts with the unknown capacitor placed across one of...

Lette

Prhti 25 words Icjr nOfl'-COrnmeri ial ad& .SlOpi r 25 uvorrla for business ventures No display ads or agency discount Include check with Ofder Deadline lor ads is the Tst ot the month two month pf*of to publication For e*amplt January 111 ii the deaden* far the March issue which will be mailed on ihr tOtb if Febnj y Type copy Phrase and punegate exactly you wtjh it to appear No a'i capital ads We will be itie judge of suitability oi adi. Our responsibility lor errors extends only to prim...

Henry K A

Cool and Easy Max, Legal Power *SSBf CW, RTTY or SSTV through commer cial ratings* 3.5 to 30 MHz * Continuous duty * Silver plated PI*L plate tank *DC relays * ALC * Built in SWR bridge * Our put power 2 KW min, in commercial service * .THE FINEST COMMERCIAL GRADE AMATEUR LINEAR AMPLIFIER AVAILABLE ANYWHERE IN THE WORLD AT ANY PRICE FOR ONLY 995- .THE HENRY 3K-A - THE LINEAR FOR THE CX 7A p You will never know how little it costs to own THE incomparable CX A or Henry 3K-A until YOU write or...

Chdini

L Diagram of counter input circuit The value of the resistor in parallel with C, at the inputf is 100K, The value of R3 equals 1.8K. and also of the MC170CG which is in a TO-99 package Either will work well in this circuit and specifications are given for both units for reference purposes. 10-1 is hooked up as a Schmitt trigger. When the voltage on the source of the FET, QL reaches the upper trip point of about 7 mV the Schmttt trigger will latch on. The output will be driven negative very...

Copper Circuit Board

Brand new GE 2-sided glass epoxy G-10, the standard of the industry, bright and shiny new. 6x12, SI,00. 12 x 12, S1.50. Buy ten pieces and get 2 more free. Due to the West Coast ship strike they came in too late for the customer. Now it's your bargain. Use it as is or build it into your own cabinet, desk, wall, etc. AN built, ready to use, with AC supply. To make it portable all you do is power it wifh a couple of D cells. Fuily assembled solid state chassis with AC power supply, less speakers....

Ic

The decoders must be chosen to drive whatever readout the builder chooses. Seven-segment readouts such as I chose are the most economical incandescent readouts, but the builder may have other kinds from surplus sources. Nixie tubes are also economical, but require a high voltage power supply, Che 7446 decoders I chose match the seven-segment readouts with 24 voil incandescent bulbs thai I used. These decoders will stand 30 volts and switch 40 mA. I run the lamps with 12 volts they are bright...

Jnput Frcq Comp

Note that the 741 can be used as plug-in replacement for the 709 but not vice 38 millihenry. Mever potted Center tapped. 5 52.50 ppd 30 510 ppd VS. For 11 model 14-15-28-32-33-Lorenz-Mite, FRESH 3lacK nylon, 12 per box, 1 b x 53.50 poetpaid US. Transceiver Model 6500A Checked and ready to operate on the landlirie-or on the air. Contains receiving and transmitting APSK units SPECIAL 515 each, 2 S25, 7 S50 12- 19* sheets. For ftC-92 or TTtCl FAX. Or cut feE& up for use or. the...

L

IrKlJ nri UWid- c ' ftrmAtmi I- I, Itlppli itl.jukiHin mnl Willi ht Id' midi' * in* Nit I fi I il- -il I.I111 . Vl.pJ. , k. i. I r ill 14 tnti llr- 1ill ill I Tn pbu 'I aiti. I* f, ty I it. *rd ini-i h. . t i'l I ht r, t-ik'l ',4> T. , I 4 - EV rd ht , ,. jw , r- , -j 1 H t*nrrf Uiv tfUfi miiHl' . f jLruLiF hitlVDfar (fritt buftll I P llfflHi rd r-whirr tEuiw-Hrri TijLiHr MU ufird lupj. .ith 711 '*p pm-ulr (hitti 5 Villi 1 M cifflpataUf -1.jJr i i . . i Klrnl m I 1 m - nl UiihiHmT ptllifdll...

Rotary Thumbwheel Switch

Brand nnv H is l a I switch, avbildbi wiiti output m itriighf decimal ft> fm nt SCO. Widely used lo sei up prcdctpr miniirj dounh or interval,digita' valued or fiigital-tn-analrH valuta Prices quaieif are i r i CH ri. or decadc. DECIMAL OUTPUT ITO pontiorO RTSDCO HINARY-CODE Ot CIMAL RTSBCO OUTPUT 2N1015D NPW Silicon 2G0W Power Amplrl pr 200V 10A 52 00 10 for 17 50 or 11JO foi Si 50-00 - JP oi Sanken Audio Amp'it< et Hy briti Module*. With the v vou can tm d vOup ov,ro iurlio dmplifjirs aT...

Uhf Transmitter

One of the later designs being released. Superb workmanship toy HUGHES. Utilizes 3 pencil triodes worth over 46 00. Looks tike a natural for 220 mc transmitter as it's on 264mc now. Simple to lower freq. W tubes & schematic. Built-in power supply 400 cycle would have to be changed. Measures onJy 3x4x8 inches, N ice piece of scarce gear, easy to work on & first class condition. 4 lbs - TA-40IC 15,00 JOHN MESHNA JR, IPO Box 62, E . Lynn Mass 01904

Square Wave Source

An overtone crystal (odd order) can be substituted for CI. For 51 ohm output change R1 and R4f reduce supply to 8 volts. Hear sinks suggested on Q1 and QZ When cutting and tying, reduce input to about 6 volts. All resistors are 14 W carbon, Capacitors in decimal are disc type (short leads). 2N708's for best performance are Fairchild (other brands work, but do not give dean waveshape). Harmonics observed into microwave regiont Symmetrical square wave at output dc...

Dx Representatives

Ltd. 178 Collins Street Melbourne 3000, Victoria Australia The Wireless Institute of Australia 478 Victoria Parade P.O. Box 36 Carlos Rohden Caixa Postal Sao Paulo, S.P. Brasil Martinus Nijhoff P.O. Box 269 9-11 Lange Voorhout The Hague, Holland Gordon and Gotch Ltd. P.O. Box 584 Auckland, New Zealand G. H, Gillman Smarts Road Waikuku RMD Rangiora, North Canterbury New Zealand New Zealand Assn, of Radio transmitters P.O. Box 1459 104 Hereford Street Christchurch, New Zealand...

Write For Complete Specifications

3224 Peach tree Road N.e Atlanta, Georgia 30305 Fluke 03 Differential AC-DC Voltmeter. 150.00 H-P 3526-A Tape Transport, for W or tape 15 16, 1 7 S, 7V3i 15, 60, 120 inches per second. H-P 561 -B Digital Printer & 5.00 DATATOTAL 1141-8 8-digit printer. . . . 25.00 Keith ley 150 A Microvolt-ammeter 100.00 APE-4 receiver with CV-253 Tuner, 38 1000 MHz, 115 v, 60 Hz 175.00 B & K 1076 Television Analyst (Flying spot scanner) 195.00 Brush BL-202 2-channel chart recorder 40.00 Type C dual-trace...

Accessories

BP-2Q2 Se' of 10 rapid charge meads 24 95 SC 202 Drop in fast charger with built m timer ST 202 Rubber uubby anienna with mating LC 202 - Leather case with belt loops and detachable shoulder strap S9.95 truly a space age 2 meter FM rig 23 channels with trimmers io* all 23 receive and 23 transmi1 sockets TO watt 1 watt cjII channel for automatic switch nq to your fa orii channel no matter where you- 2 3 position switch is call light to tell you when you're on you* call channel, and an air light...

Significant Features Not Found In Most Competitive Machines

DYNAMIC RANGE 10- to 10 DATA STORAGE 2 Auxiliary Storage Registers plus up to 7 push up Stack Registers. Roll up and roll down keys for complete control of operational stack > Interfacing provisions for printer and programmer m Correct X Allows the operator to correct one digit, without re-entering the whole problem) m Polar to Rectangular conversion and Retangular to Polar conversion DISPLAY Either full floating or scientific notation, 14 large, easyta-read digits. Kit 399,95 Assembled...

Coll

'he Collins 75A4 amateur band receiver, although it is over ten years old, is one of the best pieces of amateur equipment available1. The selectivity is controlled by mechanical filters. Usually just the 3 kHz mechanical filter is supplied, leaving positions available for two additional filters. Collins Radio still manufactures mechanical filters specifically for the 75A4 with bandwidths trom several hundred Hertz (for CW use> to (ens of kilohertz (for AM or other wideband signal use). A...

Of The Art Fm

1NOUE IC 21 mobrle b*se unit with AC DC supt y 24 ch SWR & Disc merer, HIT CaJib., mike. W o ctvswls. S359.00 Customer servicing and wairsmv included MIEDA COUNTER to 6G MR* . , S299.0 b Dio> t AC DC i 5 itrs. S50* metre lar T50 MHr St ditr Write for our very competitive package price Atw j . INOUE tC 20 12 ch., 1 or 10 waits mob.le 1973 fordetmh complete wjth mike. mount 6- 6 Xtaled ch.t -- ' -- module Const. 269.50 VYiile cr l'h ihi f2ll M7-U421) far mury fnfoiTtlttjgn ui send Cashier...

Muskegon Hamfest

The 1973 ARBL Great Lakes Division Convention Hamfesi will he held in Muskegon, Michigan on March 23 24. Ham-Hospitality will he of fered at the Ramada Inn on Friday evening the 23rd, Saturday, starting at 8 00 AM, technical sessions, swap & shop, commercial exhibitions and net meetings will be held at Muskegon Community College, More fun at the Ramada Inn that night Tickets are 2,25, Reservations and info may be had by contacting Muskegon Area ARC, PO Box 691, Muskegon Ml 49443 (see their...

Amateurwholesale Electronics

FL 33156 Tvltphone-ddvs < 3051 233-3631 - nights anfl waa i s call f305) 666-1347 * Credit terms available on export orders to qualified firms the arrangement of all of the other lettered zones described below. Times recorded in the successive I 5 degree zones east of Zone Z are designated by the suffixes A through L (omitting J). Time in the eastern half of the zone over the Date Line is suffixed M. Westward from Z zone, the time suffixes are N through X. The...

Linear

Gene Brizend ne V A ATE 600 Hummingbird Drive SE Huntsville AL 35803 This lC-saving circuit is so simple it may appear too obvious to suggest. However, should a regulated power supply pass transistor short-circuit, SI00 worth of ICs may eastly be destroyed by excessive voltage, for example. The cost of new ICs, plus the often tedious task of troubleshooting and replacement, emphasizes the need for such positive protection. Essentially, a selected zener diode is wired internally across the...

Our

30 WATTS OUTPUT, ALL SOLID STATE (no tube ). TRUE FM (not Phase modulation) for superb audio quality- 10 channels with 146,94 146.94 included. Three pole low pass filter on both transmit and receive, 1 watt low power position. Provision for tone encoder. Simple internal strapping provision allows multi-channel use of any crystal. Microphone and mobile mounting bracket supplied. Professional leve* construction by distinguished Avionics Mfg, -General Aviation Electronics, inc. The finest amateur...

Ma

ADJUST SOURCE 2 87 VOLTS ACROSS Rl Fig. 2. Setup for measuring IqsS a FET reverse meter and battery for Prt channel FET. Fig. Setting up bias point on a FET for 0 temperature shift, Here are a few examples of different 'DSS currents I measured on several Motorola MPFI04 junction FE I *s, if a pair of FE1 s were needed, such as in a bridge circuit, numbers 2 and 3 would be the best suited as they are the closest in zero bias Numbers 3 and 4 could also be used as a matched pair, hul number I...

Choose From Two Versions

MODEL CGT-144 (illustrated) antenna complete with trunk lip mount for easy, no holes installation on side or edge of trunk lip. 180 swivel included for adjustment of antenna to absolute vertical. Supplied operational with 17' MIL spec RG-58-U and PL-259 transceiver connector factory attached. Antenna is removable from mount. Shpg. Wt. 3.34 lbs. 36.95 MODEL CG-144 Antenna only with -24 base to fit all standard mobile ball mounts. Shpg. Wt. 1.84 lbs 24.95 give your mobile signal the big push this...

Pimm Imii

. 1h.n,1ll,,. ,h . i , I i I M i i i i bhii pi .1 b'b.p i tl lii 1.1 414 * II M p 11 . , , In MM It I 1*1 I PMMMMMMIM I 111 ill h p ' I 4. L . .t. .IL . . P. Ill J . M I LI Ik 141 11 III 11 M I 11 I I PI I *l F hhb. .1. .1 iktiHtlllUIUIIItlll 14 14 I I bhbpph'f II hk P.hbbbpp 'M III 1 I 44 4 4 Id I I P4 II bill-' 4*4 ll P+ IMkPP b.4.4.4kll4MIMII4,P *< ' I '.MM J. jp 1444 ,111 1 1114 I iBlllllMIIIII tllPllil < 1 out 14 14 PI II PPPP I l< * . . , I p II it. . rl .4 .Pk-Lk-fcPPIIkl t M PI 4...

Check The Advantages Of A Vanguard Synthesizer Over Other Brands

No microphonic* Can be used mobile Over bumpy roads Reference fr jLtency and spurious output down 70 dFj I excluding harmon+cs ot aufput requencv which re used in the transmitter anyway-) AH output irwjueficies are generated dtrfccliy Iron The VCO without The use of multipliers and are therefore fret of ub-hamionict Mow available with outputs in Ihe 6, 8, 12 and 18 MHz. bands (corresponding to 144 MHz dial reading for direct substitution of transmitting crystals. More output Irequ ncie5 re...

Capacitors

2 5,000 MFD, 25V - 20,000 MFD 30V - 40,000 MFD 10V 0 500V DC, 0-1.5 mA DC, 0-10V DC, 0-300 mA DC ALL PRICES ARE F.O.B. OUR WAREHOUSE, PHILADELPHIA, PA, ALL MERCHANDISE DES CRIBED ACCURATELY TO THE BEST OF OUR KNOWLEDGE. YOUR PURCHASE MONEY REFUNDED IF NOT SATISFIED. TERMS ARE CASH. MIN, ORDER 5.00. ALL MERCHANDISE SUBJECT TO PRIOR SALE. RFE - REMOVED FROM EQUIPMENT, WINTRONIX MODEL 850 INDUCED WAVE FORM ANALYZER. Thu unit, in conjunction with vour present osc.iloscope permn* you to view wave to...

New

Designed for the man who demands professional standards in 2 meter equipment. REPEATER LINE fixed station antennas are the 2 meter HAM's dream come true. With everything you need for top fixed station performance toughness, efficiency and the gain to gain access to distant repeaters with ease. Work many stations, fixed or mobile, without access to a repeater The right antennas for the new FM transceivers ,or any 2 meter fixed station. REPEATER LINE Fixed Station Antennas Tough, high efficiency...

And Insurance

If you are a newsstand or other casual reader of 73, read no further just complete one of the subscription forms at the right and save. Yes, save. You will not only save at least half of your money but also valuable time and maybe taxi fare, shoe leather, etc. Just took at the benefits of not having to expose yourself to all those comic books and love story magazines at the newsstands. Wouldn't all that be distracting when you have 73 on your mind You might even save yourself from being mugged...

Repeater Users

If you warn reliable access to the repeaters in your area, you want and need SENTRY CRYSTALS. SENTRY CRYSTALS are custom made for your rig. We don't stock a large quantity of crystals for a certain frequency and hope you can tweak them to frequency in your rig. We do offer FAST service ton crystals made especially for you and your rig. if you want reliable, on-frequency operation, INSIST ON SENTRY.

Circuits Circuits Circuits

The following circuits have appeared in the referenced, books, magazines. application notes, etc, While we try to reproduce all of the information that should be needed by an experienced constructort readers may want to avail themselves of the original sources for peace of mind. Readers are requested to pass along any interesting circuits that they discover in sources other than U.S. ham magazines. Circuits should be oriented toward amateur radio and experimentation rather than industrial or...

Digit Assembly Alpha Numerical Type Readouts

X 5 each - contains 210 neon lamps, 210 hi voJtage N.P.N. Drivers. 21 ten bit shift registers. Serial to parallel. PRICE 9 95 METERS PANEL TYPE WESTON MODEL 1238 0 500 microemp* full Kale calibrated ,005 to 500 roentgen hourj, 270 degree cale, appro*, 3 dia excel lent for wavemeter etc. New and in original boxes.

Spectra Strip Flat Bonded

We know Ihtt i) .+HhaT eve yi r*- v antsj tor then hoire ttr& N projects, txna th y alw yi Id* t. We no v over 5 iiy to feet ixit t won't last long, so ordei now before ii's 11 pone. We don+t want any broken titiai ts. Specs 20 cnmdun. rorir AWG, 7 strandtj sifr- ij. QiJ k GW . WeoOiJid give all ils virtues, but most people know them or euuhi easily lorik n up m any induitrial elections house Cataioyu Sh Wt lb, 10 fefcL,M.Or W No SSFBRC i+r Price .35 Tft St 00 3 ft S5.00 18 ft, S30 00 i00...

Xmtrs

2.1 3MC T 18 ARC-5 New 4.95 4-5.3MC T-20 ARC 5 Exl. Condition 3.95 4 5 3MC BC-475 New 5.95 MD-7 ARC-5 Plate Modulator For Above Xmtrs Exl. Condition 4.95 P.O. Box 9266, 7360 Atoll Ave North Hollywood CA 91609 Tel (213) 875-2970 & 764-9030 Repeater was built and imaintained by W2BHK, W2FLY, WB2EVU, WB2PSS, WB2PJS, W2IUI and myself. Plans are slowly underway for solid state conversion - to run completely off of wet cells in case of emergency. Any further information can be gotten from me if...

Sstv Makes You Feel Young Again

Remember the excitement and enthusiasm you felt when you fis-si started in amateur radio Dozens of hams have told us that working SSTV has renewed that same thrill and enthusiasm. In fact, they become so fascinated, and enjoy working SSTV so much that they stay up half the night working other SSTV stations. Now, when was the last time you got that excited over amateur radio Order your Robot SSTV equipment now, and get in on the fun. Or. write for the full SSTV story. But do it today. Please...

Waller Electronics Test Equipment Sales

Box 9913, Chevy Chase, Md. 20015 The TESCO P A D'1 has no tuned coMs to go off frequency, no tuning necessary or euen there U s all in one ''Black Box LC_ ready io go, The TESCO-PAD has a 1 second hold up for your transmitter, complete P.T.T* operation, available with dual audio Output levels, 12 or 16 tone combinations, (Add 1.00 for 16 tone version) ( 2.00 for dual output version) WOW BRUTE FORCE IN A 12V BENCH SUPPLY-THE WALLER 60 AMP 12 VOLT SUPPLY A bench power supply for mobile...

Wire Wrap Computer Wire

Nt vu surpJus from a lirgo cornpuier comt> inv. Solid tlilver ulaT-ed OFHC COppfti r iinilut tof Special high Temperature, thjn-waJI insuiaiion of tetlon.an< 1 other qualnv rnait-naU Extremely mgged and flexihle wire-H-.rap wr , tn addihnn To dsual pplicdtion-. tor> hr uv'd for effect'Vf- brwdtwartf rog, srd whtiftvui quick Stripping of solid wire itdeured. Different colors ire rw> e, available tint* wCWid* and iturd choitt o totori Sh pp'fig sveighl ptr 500 if 1 lb. Conductor Orde<...

Write Or Call

Box 2084 Dept. M Bradenton, Florida 33506 Phone 813-746-4175 sure you have soldered the termin is that are factory slaked into the hoards. The oscillator and mixer operate on 6V dt A quick check of oscillator output can be performed by using a fie id strength meter or by measuring current flow in the collector. Next mount the boards and preamp using the screws and stand-offs supplied. Connect the antenna to the preamp input, If the distance is over 2 cm use...

Offset Control

Op-amp with offset control. The output voltage is given by equation Co -Cl Rl Rl -C2 Rf R2 So far, very little has been said about dc offset. This effect is just the dc output voltage that exists when the inputs are returned lo ground. This defect is caused by the JC imperfections and can be easily controlled by adding a dc signal to the input

L Robot Research Inc J

This article presents a description and analysis of some of the circuit elements commonly used in slow scan gear. The data presented will be very useful to those wishing to experiment with different circuits but a light reading will provide you with some of the basic circuit functions. A thorough understanding of the material presented here is not essential to buiJd and operate the circuits to be presented later, but it is presented for easy reference if you desire to go a little deeper into...

Best

Contains almost every conceivable cir cuit that might be need ed for use with a re peater, All circuits ex plained in detail and easily understood. All aspects covered, from the operator io the an tenna. Also contain* chapters on setting up a mobile station and many other articles tor the use of the VHF and UHF enthusiasts 305 pages, softboundr 5. Hardbound, 7.

Out

High frequency phase locking. Anolher appiicalion of the PI L is in the generation of the FM video in the SS camera. Here the PLL-VCO is changed in its frequency output by the incoming base band video. Only the VCO part of the PLL package is used here. The formula for calculation of C) is the same as before, f he design should result in a frequency near lhe 1200 to 2300 Hz FM band of interest. The actual design of this VCO circuit is given in a later discussion of the integrated...

Only Telrex Gives You All These Features

Power rating 4 KW PEP . . rain or shine Patented broad-band coaxial Balun Heavy-duty steel gusset mounting plate Aluminum boom 2 in., 2Vz in, O.D, x 18 ft, Large diameter, ,058 wall taper-swaged dural elements for minimum weight and exceptional strength to weight ratio * Stainless steel electrical hardware With a Telrex Tri-band Array you get 49 lbs. of educated aluminum engineered and built to provide many, many years of performance unmatched around the world by any other make. Longest...

To Converter

To use coax with a 300H input, connect the shield to chassis ground and the center conductor to one of the 300 1 inputs. LAMPKIN'S NEW FM AND AM MODULATION MONITORS Forty years of LAMP KIN know how are designed into these new precise wide range, versatile FM AND AM MODULATION MONITORS. NOTE A FEW OF THE FAMOUS LAMPKIN 205 B DEVIATION METERS ARE AVAILABLE AT 348,00.

Laboratories

TV And Communications Antennas Since 1921 Asbury Park, New Jersey 07712 201-775-7252 Capacitance Measurement by Frequency Shift Why, you might ask, should another article be written concerning capacitance measurement when dozens of articles have appeared on this subject in the past I have reviewed some of them and find that specialized equipment is generally required that may not be available to the average amateur such as a precision calibrated variable capacitor* a grid dip meter, or a...

Test Equipment

IF Y< JU f.nobdbly l ldv ktluW I hj hJVJpg tpne buhlt Cjpdtvhtv on yp t i .fl f4 pfe ly rfTipf r ani ih ir ridyo ll you'** hud j problem fmdtnfl a qualify, nfhahl-e torn' burst the jmww is the UNI OY NE T BG T 2. * SOLID STATE, TOP GRADE COMPONENTS EPOXY GLASS f> CB. * REQUIRES NO BATTERY INTERNAL REGULATED P S FOR lO JBV. * FREQ. RANCE 145B-245U HZ. SPECIFY TWO FACTORY PRESET FRE GUENCIES WHEN ORDERING, * BURST LENGTH 100 MS. b SEC. OR CONT. TONE. FACTORY SET 1 2 SEC * HIGH AND LOW...

Mow

Or c1 ii f ' fitiii i putf ttflH. f ow rrfiHtf in 'itwdf tfiHdv I c J it-jufh mti-ir lu* At tMl wniti (H t> - nit 1H> VT and ii'K t biiiHid Thpoufh Iw pan. fKhnt ud ml WN < hH Eus-t Ultr sowihi UtHl in rrwg.itni cciiAH< t Ml UMi Uttll l> lrt hkgtw ifyJ J-nr t* H'UhM H r QOJ Bi 0 f*e1konti CowKir, 3 MHr gpftitMjn M i two iftfui nri qn' - rtiji Ndkli il* uftit COtanl oifi W(tud4 lifflPt fthfff Itn ajunfrf i(H W1 I * rtuitthi md corftn dhin '< JT'-J motvtarppig a mutnr' ar * I r...

Wfja

INOUE COMES TO ADIRONDACK RADIO SUPPLY, INC. T, Inoue, President of INOUE Communication Equipment Corp f of Osaka, Japan, and Don Specht, export manager of the same firm, are showing Howard Hinkle, President of Adirondack Radio Supply, some of the many features of the incomparable INOUE fC 21 2 meter FM transceiver. Today why not check personally the many exciting features the IC 21 offers, such as 24 channel capability Front panel P,A> tune control * Separate S and discriminator meters*...

Microwave Diodes

Amperex Electronic Corporation has announced four new lines of microwave diodes for communications and other commercial applications. The four lines include 1 1 Schottky barrier devices four tuning varactor diodes, 23 Gunn effect devices, and five I MP ATT devices. The 11 Schottky barrier diodes are intended for low-noise mixer and de lector applications up to 18 GHz, All 11 types in this group are available in matched pairs. The four tuning varactor diodes are high Q, GaAs. Schottky barrier de...

Mk

Wicks WB6KF1 30646 Rigger Road Agoura CA 91301 Time and tide wait for no man. So runs an old English proverb attributed to Chaucer in the 14th century. As far as time is concerned, this is not surprising with time moving at the speed of electrons in space, man is ruied by time Time has influenced all of the actions of mankind since the beginning, when the caveman no doubt planned his life around the rising and setting of the sun. Wars have been won and lost because of time, or the lack of...

Also Available

COMPATIBLE DECODER unit contains notch nitei lo pra ni annoying tone burst input truin beinfl retiransmm Fully idfuilatote range and window for burst frequency, length an J ampHttJde aFiitr luiic to pFeuent repeater ciroppul during input stgndl fades. REPEATER CONTROL unit complies with LATEST FCC REPEATER RULES incEudmg adjusrabfe timtrs lor 3 minute protection and 5 second car*ier cfelsv drop our Iricludc* CDS. CARRIER OPERATED SENSOR far use witg orwth& ut rdtjy.

Yaesu Ft Auto

Great new features like Auto-Scan and a special Priority-channel place the FT-2 AUTO in a class by itself. These unique capabilities are achieved with advanced digital-logic circuits. Here's how they work With Auto-Scan on, the receiver scans all 8 channels at 20 channels per second, indicator lights provide a visual channel display, stopping on receipt of a signal, At the end of each transmission, the receiver continues to scan. (Just push a channel button to skip over any channels you wish...

Mhz Choice

GAIN WITH LOW VERTICAL ANGLE STANDARD * - 24 BASE THREAD FOR BUMPER OR TRUNK LIP MOUNT Antennas of similar appearance and efficiency are now available for Commercial, Public Service, CB, and for use in the Amateur 10-15-20-40 and 75 Meter Bands. GETS RADIATOR ABOVE VEHICLE SUPPLIED FOR DESIRED FREQUENCY

Repeater Keying Line Control

A circuit for controlling timed functions in a repeater. The use of the new Si fine, tics NE555 IC timers eliminates electronic and mechanical complications. Every repeater has a neeJ for two basic I timing functions. The first is the delayed drop out. A short time delay between the release of the COR and the transmit Ier drop out is necessary to prevent the transmitter keying relays from chattering on a signal that is fluttering in and out of the repeater receiver. This short delay, usually...

Wheaton Hamfest

The Wheaton Community Radio Amateurs will hold their 11th annual Mid-Winter Swap and Shop on Sunday, February 11, 1973 at the DuPage County Fairgrounds, Wheaton, Illinois. Hours 8 00 AM to 5 00 PM. 1.50 Advance 52,00 at the door. We are expanding to two buildings this year. Refreshments and unlimited parking Bring your own tables. Free coffee and donuts 9 00 - 9 30AM Hams, CB'ers, electronic hobbyists, friends and commercial exhibitors are cordially invited. Write W.C,R.A., Bill Rambox, WB9AVD,...

Nc

.0025 . guaranteed tolerance Dealers Write far our special Distribution Price Program. Post Office Box 508 919 Eighth Street Prague, Oklahoma 74864 *For most standard FM sets Regency Clegg Drake Swan Sonar Telecomm Tempo Varitronics IC-21 Johnson Ross 8c White Ken KP 202. Standard & Gladding add 1.00 ea. Please rush the following crystals to M,0. or check enclosed for full amount. For postage and handling add 1 5 crystals 25< i 6-10 CITY

Burroughs

R- with riffiit and lefl detf- imals. Neon red. Require S2.9B 175 Voltfi 7 mils. iv k O.S character mtv Fluuresctnt Blue-Gr eir 0 3 numtrili, dtclimli md lvtt*r . m H W, < 'hhruct(-rA Kilmtirnt Vr. MINt-7 * 1.75 * 1.7 .JfiO it 570 t,SV AC DC 42 fj Soch* Q SLIM-7* 1. * 0.375r' .40 a l.ftV AC DC 42 mJU G 5 li*t *Co-mpatibi ta 7 Krrwm drlvar IC* . By RCA or equal 2N3 3J2. NPN, 23 watts, 3 amps, TU-60 case, with *lud mis. VCEV ma* 65. leds, visible, rmrro-TTniiiature, nxial leads . . . LEDST...

Order Free If Not Shipped In Hours

San Diego, Calif. 92105 To most people this is a symbol from Greek mythology. But to hundreds of thousands of active amateurs, Pegasus is the symbol of the Radio Amateur CALLBOOK the single most useful operating reference for active amateur stations. The U.S. Edition lists over 285,000 Calls, Names and Addresses in the 50 States and U.S. possessions while nearly 200r000 amateur stations in the rest of the World Both editions contain much other invaluable data such as...

Repeater Licenses

Firstly, to establish my bona fides - the following is what I managed to glean from an all-day confab with the FCC (amateur division in Washington, Hopefully have not screwed it up too much. The fact emerged hat repeater licenses are going to be a lot more difficult to get than most repeater clubs realize if they insist on going for a license for their complete system right off the bat. As the complexities of providing satisfactory information on the many aspects of the license grew more...

One Meg Thoughts

The new regulations ha ve had quite an impact on repeater operations. The complexity of getting repeater licenses have noticeably slowed down the ap pearance of new repealers on the two meter band - as well as on 220 MHz. But inost repeater groups are in agreement that this is a temporary slowdown and thai there will be a big need for more channels before long. The opening of the 147 MHz segment made a hunch more channels available, but it also made a one MHz split feasibie for the first time,...

Ts Freq Meter

Stmila* to The familiar BC 221 except this one covers range of 20 450 nrvc. Accuracy ,005 Used, guaranteed OK, less batteries, with schematic. TS 323 ship wt.35 lbs 50.00 Solid state noise actuated switch fully wired, includes mike pick-up, amplifier, SCR switch. Actuates by noise or whistle. Useful for burgiar alarms, lamp lighter, etc. 15 ft range. Ruby red, gold plated leads. With mercury cell for instant testing. Alpha-numeric keyboards. Excellent to new in condition. Styles may vary...

Zo

Fig. 3a, Plot of discriminator filter for W1SNN RATT converter. Fig, 3b. Single phase shift filter Fig. 3c, Cascaded pair phase shift filter. FEBRUARY 1973 Fig. 3c, Cascaded pair phase shift filter. FEBRUARY 1973 dance was required, but higher values can be had by simply changing the value of the emitter resistor. Do not try to drive a high level signal into this filter 3 mV in produces 0.3V out, which is sufficient to drive any detector, A maximum of 12 vol is should never be exceeded for the...

Specifications

FREQUENCY RANGE All amateur bands 80 through 10 meters, in five 500 khz. ranges 3,5-4 mhz., 7-7,5 mhz., 14-14,5 mhz*, 21-21.5 mhz 28.5-29 mhz, (Crystals optionally available for ranges 28-28,5, 29-29,5,29,5-30 mhz.) SOLID STATE VFQ Very stable Colpitis circuit with transistor buffer provides linear tuning over the range 5-5.5 mhz. A passband filter at output is tuned to pass the 5-5.5 mhz. range, RECEIVER OFFSET TUNING (CLARIFIERh Provides 5 khz. variation of receiver tuning when switched ON,...

When Price And Quality Are Important

The Model 60 Frequency Counter (shown with 160 Hetrodyne unit) measures frequency from 1 KHz to 60 MHz with a full 5 digit readout (overranging feature provides an equivalent 8 digit display), With the optional 160 Converter, this tiny (less than 4 pounds) counter will also read 130 to 160 MHz with a sensitivity of 50 MV- With inputs of up to 100 MV, the unit will cover the full range of 110 MHz to 170 MHz. Only three switch controls provide complete operation just plug in your signal and read...

Kvmh

Complete with Dynamic Mike, O T S Carrying Case, 120 VAC bnd 12 VOC Cords, Speaker Headphone Plug and 10 Ni-Cad Batteries. AA-22 Amplifier 149.95 MMK-22 Mobile Mount 9.95 BBLT-144D Hustler Ant 27.95 Over-the-shoulder, mobile, or at home Completely transistorized, compact, portable. Capacity for 6 channels. Built-in telescoping antenna, and connector for external antenna. Use barefoot or with accessory amplifier, External 12 VDC or internal ni-cad batteries, built-in 120 VAC battery charger,...