Mcn Germanium Diodes

TO 18, no test 3 2N70S MESA, 30U me, U00 mw. imp. TO IS 2 ADO MC, 2N709 NPN Silicon planar TOli, . 10 PNP SWITCHING TRANSISTORS. 'N 101. TO. 10 NPN SWITCHING TRANSISTORS. 41 15 PNP TRANSISTORS, 'KTU_'. 2N3.1. 107, no list IS NPN TRANSISTORS, -N. 170, l l'l, no test 30 TRANSISTORS, rf, If. JiU'lio ose-ifs, TO , no test 10 FAMOUS CK722 TRANSISTORS, > np no test 5 2N107 TRANS'TRS, by (J K, > np, fjc11, audio pak 2 40W NPN SILICON MESA LIN l< MS 25 ZENERS GLASS...

Complete

Pro all the way, from concept to execution that's what ham editors say about EICO. Critical customers agree, and like the tow price, too. They've made the 753 kit, for example, the industry's hottest seller And the new 717 Keyer seems headed for the same fate* Highlights of both give you some inkling why The EICO 753 Is a complete 3-band transceiver offering SSB AM CW operation with conservatively rated 200 watts PEP on all modes (rated for maximum efficiency rather than maximum possible input...

Lectron Ic S

TELEPHONE POrter 2-8759 1320 19th ST. Dovid Large K7DEP Rt. 3, Box 384AA South White Road San Jose, California Here are some useful applications for a little-known circuit. The rf discriminator is potentially one of the most useful of receiving accessories. Unfortunately, its use among hams, other than in an occasional VHF-FM receiver, is rare This may be clue to the lack of information available in amateur publications on the possibilities offered by (his device, Some of these applications as...

Gonset

To AMATEUR ELECTRONIC SUPPLY 4828 West Fond du Lac Avenue Milwaukee. Wisconsin 53216 ' Ship me the following Reconditioned Equipment COD 1 yeat 2years 3years I 1 Send Reconditioned Equipment Bulletin HT-33 Linear 169 HT - 33A con. to Bj 269 HQ-I70AC Rec 249 HQ- J70AC with

Lambda Regulated Power Supplies

Model C281M 125-325 Volts at 200 Mills 30.00 C481M 125*325 Volts at 400 Mills 40.00 C881M 125 325 Volts at 800 Mills 60.00 C1581M 125 325 Volts at 1.5 Amp. 99.00 RAYTHEON Voltage Regulator Model VR6116 95135 Input 115 Output at 250 Watts Special 15.00 All equipment in Excellent Condition Mass. Res. add 3 Sales Tax 321-329 Elm Street Cambridge, Mass. 547-4005 CRYSTAL UPPER SK HI-TEIl 4990,00 center freq. 6db band puss 4.990400 to 4.093250 MC stop band at 50db, 4.985 to 4,U89G MC. Input 3000 ohm,...

New Products

Band conditions are improving every day, and Electro-Voice lias just published the new, fully-revised, fourth edition of W9I0P s Second Op, This well-known operating aid of durable, laminated card stock is actually a simple DX computer providing vital data such as beam headings, identification of prefixes, time zone, continent, and postage rates. Included also on the periphery of each Second Op are provisions for logging contacts and receipt of confirmation. You can get your new Second Op for 1...

To Dc Input On Heathkit Vtvm

Heathkit Vtvm

THIS CAN 8UJLT WTO A METAL TUBE SHIELD, USWG A 9-PIK SOCKET Fig. 4. RF probe for tuning up EI Marrinero. popular as it saves a tube. Just don't use silicon diodes or it won't work, there has to be in-tenial leakage. The original circuit used IN67 s but lN298s and N38's have been used. The RFC keeps the rf from getting into the audio which might cause hissing. A 47 kQ resistor works just about as well as the RFC. This completes the receiver. To align it it would be nice to have a signal...

Buys Surplus

FULL OF TOP QUALITY ITEMS - Transmitters, Receivers, Po er Supplies, Inverters, Microphones, Filers, Meters, Coble, Keyers, Phones, Antennas, Chokes. Dynomoiors, Blowers, Switches, Test Equipment, HeodseH, Amplifiers, Indicators, Handsels, Converters, Control Bcxes, etc,, etc. SEND 25c stomps or coin for CATALOG and receive 50 f CREDIT on yogr order. Address Dept. 73 Price S2 per 25 words for nort-commereia ads 5 per 25 words for business ventures. No display ods or agency discount Include your...

Top View

Layout and construction of the local oscillator-multiplier shown in Fig. 1. V3 size. Like to get on 432 MHz Activity on the band is increasing even day, and the converter described in this article makes it possible for many hams to increase their frequency coverage and modes of transmission. This transmitting converter can be built at reasonable cost for operation on 432 MHz using CW, SSB, or AM, This is a linear system which reproduces the type of signal that is fed into it. The input...

Gpj

Here's the ideol substitute for a key Touching the touch plate with your finger turns on the silicon controfled rectifier iSCR , which throws the relay to key your transmitter. rent is applied to the gate of the SCR from the batten HI, This turns on the SCR. which supplies half-wave power to relay RY1 to energize the relay. Diode CR1 provides a return path for the relay-induced voltage and is necessary to prevent 60 cycle relay chatter, i he SCR triggers when a low level positive current...

Model Meter Ssb Transceivei

Don Nelson WB2EGZ 9 Green Ridge Road Ashland, N.J. 08003 Don Nelson WB2EGZ 9 Green Ridge Road Ashland, N.J. 08003 Simplicity wins again with this easy-to-build receiver for local contacts on the 220 MHz band In the August 73, I left the realm of sophistication to describe a simple, low power 220 MHz transmitter which lias enjoyed a remarkable performance record- Here is he companion receiver a two tube superregenerative unit which may be constructed 011 the same chassis as the transmitter....

Vac

7360 Mixer

NOTE ALI VOLTAGES MEASURFD WITH HF AT W Kit VW M Fig. 2. Opposite page . Schematic of El Marrinero. A ,01.uF capacitor between the 2001J carrier balance pot ond the cathode follower. because both signals could not be taken from the same point because of the by-passing effect of the .01 F in the ring modulator, it just shunted the signal on the detector to too weak an output. The solution of taking the product detector from the oscillator plate and varying the coupling capacitor i50 pF value to...

Get

Ray Grenier K9KHW M r Majl Order Sales AMATEUR ELECTRONIC SUPPLY 4828 West Fond du Lac Avenue Milwaukee, Wisconsin 53216 7 I am interested in the folfowing new equipment 1 have the following to trade fwnafs your deal Ship me the following New Equipment COD 1 year 2 years 3 years Send Reconditioned Equipment Bulletin AC i, 5, 6t 7, 9. 0 Bhutan Ar3 Wikkim AC4 Tibetl AF J a amp t Paklatan AP ffeat Paklstan HV, C3 Formofi Taiv n UV C China CE Chile TE See KC4 CE0A Kt er Island C C0X San Felii CB0Z...

Left Handed Vibroplex

As a matter of fact, if the current offerings of the telegraph key manufacturers are any indication, it may become as popular as single-sideband. The traditional mechanical keys are still around and in a variety never available before. But the big new sound on the CW bands comes from the keyers electronic devices using space-age circuits to make sending easy and more precise. The electronic keyers require SPDT key action. So. tor the first time in many years, the Sideswiper...

Low Sano

Fig, 1 Schematic of K6HMO's low-noise, low-cross modulation two meter converter using inexpensive field effect transistors FET's . This converter con give a noise figure of under 2,5 dB, gain of 27 dB and very good rejection of cross modulation products. are present. Some readers may have had trouble with FM and V stations showing up in their transistor converters or receivers. It is usually insufficient front end selectivity and resultant cross modulation which are responsible. lie field...

Peter W Dahl Co

3314 Diamond Drive EL Paso, Tuxas Please include your zip code whenever you write 73 about anything RT22G ARH21 TA AS Tnuisa h rr. 5W2-1213 mc EX -TN129B APR9 Turinj Unit. 230iMjr gt 'mi lt i. Vt Tubes IA 21 75 10226A APR9 Panoramic Ifldlfrtor, W Schematfc .KX 10,50 AN APN86 Uitfnna, Boeing I irt Sul 4-2140-2 ____NEW J gt 75 UPM4A Scope HV and Filament Transformer NEW i .7 gt UPM11A AVC mil w S TiiIjps and Wiring Diagram .NEW 4,50 R316A ARR26 U-Tube AM FM Supcrht-t. 1G2-1H mc LN 2 ,75 C610...

New Tronics Corp

3455 Vega Avenue Cleveland, Ohio 44113 Jim Kyle K5JKX 1236 NE 44th St. Oklohoma City, Okla. Does the line voltage tend to wander about a bit at your QTH Or are you checking out new gear and needing a way to simulate high or low line-voltage conditions One way out of these and all similar problems is to buy an adjustable auto transformer. General Radio calls them Vaiiacs and other people have other names for the gadgets, but they're not too unfamiliar. However, they are expensive. In sizes rated...

Laboratories

For the average amateur located on a small city lot, the problem of an adequate low-cost beam antenna system has never been properly solved. Now Henry Radio has exercised its unique experience and buying capacity to break the antenna barrier. Here is a complete antenna program pre-engineered, pre-matched and pre-packaged to suit the average QTH and the average pocket-book. Tristao CZ337 New concept 40 ft, crank-up tower 100 ft. RG-58U Coax CDR TR-44 Rotator Hornet TB-500-B Three element...

Tristao Tower Co

Tristao Towers

415 E. 5th St, - Hanford, California 2t SEMICONDUCTOR ClftCUtT 'J hmum , 8 dioJti -i 1 amp STASf HEGH G N, LO NO E VIDEO AMPLsF-Eft iELF-COHT A S 0 ELECTRONIC REGULATED PO tR SUPPL PrEC PRINTEC DROHT BOAffD CONSTRUCTS RF fck 2-Jl or VIDEO OUTPUT T CO T- nS -rd g- - - - ctt nf, V Ti . jrr fea , -p-'. rBv foL- . i C i dr' -i 7- ev 1lr PC'fijni-lofraf-rt -i - i' ri, mut cipcc pi, -i-ilekci, siti, kftobt, .ndi 0fl ubr ftcttl cg r utpui amp -cectdt .FC PLUS OUR LARGE, iASTnTG-FOLLD CONSTRUCTION...

Tristao Towers

Tristao Towers

Featuring ADD-A-SECTION Design Tristoo - . . the pioneer name in tower design and manufacture. Here is the tower line that is premium quality, yet realistically priced and designed to enable you to keep adding sections as you grow. A Tristoo Tower is a lifetime investment from your very first section. Besides engineered qualify, all towers feature channel lacing and are hot dipped galvanized inside and out. They meet all building code requirements, Motorized models available. Write for FREE...

M

In amateur equipment, usually caused by defective coupling capacitors. while two pairs indicate 120 Hz trouble. The former is caused by poor grounds between the camera, monitor, modulator, and other equipment. Also this hum can be caused by heater to cathode shorts in video amplifiers or by defective power supplies using half wave rectification. 120 Hz hum is always caused by defective full wave power supplies. Use plenty of filtering, 80 to 100 iiF capacitors should...

Amplified Zener

The effective regulating voltage can be adjusted by correct application of ordinary germanium or silicon diodes. placed in series with the zener, as shown in Fig, 9A, The reverse-biased zener and the forward-biased diode point in opposite directions. The d rawing is arranged so that positive current a conventions-flows down. Fig. 9B shows the diode in series with the load, so that its voltage subtracts from the zener voltage. They seem to be pointed in the same direction, but the...

Avc

Block diagram of El Marrinero, a portable 0 meter SSB transceiver built by W6BLZ, The circuit is quite simple for o sideband transceiver. Optional VOX is shown in Fig. 6. rg, 1. Block diagram of El Marrinero, a portable 0 meter SSB transceiver built by W6BLZ, The 3 all self-contained with the 700 volt power upply all on one chassis. It uses a olins 455 Hz mechanical filter which can be obtained y sending 26.50 to Mr. Don Iacoboni, Colins Radio, 19700 San Joaquin Road, New-port ieach,...

Fieldeffect Transistors

Developed espetialfy for the sophisticated amateur who knows enough to demand the finest. The DAVCO DR 30 as amateur designed and professionally engineered to provide exceptional performance under extreme environmental conditions and combines advanced design with simplicity of operation. It provides all the latest state-of-the-art techniques jn an ufira-compact unit just 4h x 7-1 8w 6d . Every DAVCO OR 30 is hand crafted, inspected on the line during production no less than 60 times and put...