Info

Inside of the digital reado jt variable frequency oscillator. inside of the digital reado jt variable frequency oscillator. To transfer the movement of the shaft into correct readings on a counter, all that is needed is a gear with the correct number of teeth to couple the shaft to a counter. My counter (modified part from old BC-653) reads 0-500 kilz and has a large vernier wheel for visual readout to 200 Hz. The readout mechanism I used is bulkier than necessary, Suitable counters are...

Hygain Electronics Corporation

Highway 6-Lincoln, Nebraska 68501 0-5 8 OIA. E-3M DIA, F L-l 0M OtA. Fig. 2. Layout of the chassis of the Poor Mori's 220 transmitter. 0-5 8 OIA. E-3M DIA, F L-l 0M OtA. Fig. 2. Layout of the chassis of the Poor Mori's 220 transmitter. the correction. Now replace the crystal and readjust C1(J in conjunction with CVi to find maximum output. C13 is now permanently adjusted until a new final tube is needed. Recheck neutralization, then adjust C14 for maximum output. Peaking of C7 and CUi...

Series N Connectors

*C USE *ITH MtO*UM 5JZE COAwAL C*8l 5 SuC* 15 rtC-fi M FWW DC to IGJDOO MC Trflt*OCO CUAJNG ENSURES POSITIVE CONNECTION UNDE ROUGH ySiGE WTt ttrppf - TALNER I MALE NNE< T3H r-F rtfl- CPElE CTHlt THE -EV-H E TONNE ' ' The , ARE ffcuaEflATE PWF MMCE i OONTPNLnHSS . i QMPEN ATl ' OR flfei -r. fj.UTiCT IN Thi -on Wi p- , ,Mj l ( ffFR CtHDUCTOH fiiBPECTlViLr

Remove Braid Ano Dielectric To Dimension Shown Tin Center Conductor

STRIP BRAID FROM DIELECTRIC TO DIMENn SION SHOWN TIN BRAID SHOE HOOO CVEfr BRAID SOLDER CONDUCTOR TO CONTACT SLIDE HQOO FLUSH AGAINST RECEPTACLE AND TACK-SOLDER HOOD rLANCE TO RECEPTACLE FLANGE. SOLDEp HOOD TO BRAID SUDE HOOG OVER 8PAID AND FQRCE UND6R JACKET. SOLOER CONOUCTOfi TO CONTACT PUSH HOOO FUUSHAGAINST RECEPTACLE TACK-SOLDER HOOO TO BRAID THROUGH SOLDER HOLES WITH DOUBLE 8RAIDED CAQUE HOOD GO S OVER tNNER RAID ONLY OUTER HRAIO IS SOLDERED TO OUTSIDE OF HOOD

Vanguard Labs

196-23 Jamaica Ave, Hol Ii , N,Y. 11423 Chorles Jimenez WA4ZQ0 17001 NW 53 Court Opa Locko, Florida Build this simple preamplifier to soup up your inexpensive receiver. It's perfect for novices, When I began as a novice about a year ago, I realized that my Knight-Kit R-55A receiver could definitely use a bit of help in the front end, I scrounged around for a suitable circuit of a preamp. After flipping through various magazines and handbooks, 1 found that they all called for parts which I...

Epsilon

Album t ntalns three 12 LP's 2V2 hr, instruction No Visual Gimmicks To Distract You Based on modern psychological techniques This course will take you beyond 13 w+p,m* in LESS THAN HALF THE TIMES Also available oh magnetic tape. See your deafer nowl 206 East Front Street, Florence, Colorado MARK m KF IMPEDANCE Bn< 3tf< repi inted from August *61 73 Magazine excellent article plus 13 en- a rpetl di Barums available f< n 1, 73 Magaz ie, Peter-hor u h N,H. Q3458. WANTED Topcoo Super D...

Fone

The BE SB 34 pock & plenty of punch on 80, 40, 20, qnd T5 meiers sidebond with 135 watts PEP. (Slight Jy lower on 15). Also covers MARS ond out-of-bond DX frequencies. Built-in Supply for 12 Volt and U7V AC, Solid-state switching , , no relays. Solid-state dial calibration. Deita Receiver tuning. Low frequency drift. Dual-speed tuning. Feature-wise , Dollar-wrse , . , Also in stock S& E Model SB2-LA 4-band Linear Amplifier S We maintain the largest ifock of used equipment in the Northeast...

N N

U UG-332 U UG-171 U Not Weatherproof Not Weatherproof Not Weatherproof Net Weatherproof Table 2. Coaxial connector guide adopters between different series. Table 2. Coaxial connector guide adopters between different series. These weatherproof connectors have a maximum peak voltage rating of 1500 volts and a practical frequency limit of 10,000 mc. There is a high voltage version made for use up to 4000 volts peak, but this connector should not he used in...

With Variable Output Level

No* i mti Turner cvn t ttw veF> finest iMte sldii on rtvciiiptPL-< ic ever dc tf trie Mr le.iiu'es j two trjnsntgr pre-jmp *iii-. voitirne ct> np< ii tiN give you up tn i0 times the niptpui irvel rig* hflvf Ye*. just dttl your destad iHPial ioi Mi.ixi-mum mndulnttan The lime rt rry Hint Vou c4n work tlove f> r jr ifcj-pti this iTTicrr'ip' on or chjng tne output fQf *fli irrtu yt.tii wl nt kreft* -t Up TO u'l st njtbel tJi Itmti1 Jffi hf, IjiJ I Ireq t a*' jpcnsr Of SW tKl . p lor b<...

Dpdt Switch Internally Connected In Deenerczed Position

Leon Vice W5VCE W50BC Communications Officer Houston Civil Defense 724 Gillette Street Houston, Texas 77019 Use a dime whistle to activate this simple tone controlled squelch. Have you ever wished you could monitor your favorite net frequency and hear only pertinent calls without all the associated noise, QRM idle chatter, etc. Maybe this gadget is just what you have been looking for. Certainly it furnishes a practical method of monitoring local emergency or traffic nets. Necessity is the...

Absorption Uhf Wavemeters

Hand calibrated from crystal oscillators by K1CLL Now you can find the 432 and 1296 mc bands, Know the frequency of your doublers, triplers and oscillators. Don't guess UHF-3 350 to 1400 mc Af f,ve for *45 LARGEST SELECTION in United States AT J-OWEST PRICES 48 hr, delivery Thousands of frequencies in stock. Types include HC6 U, HC18 U, FT-241, FT-243, FT-171, etc. SEND 10< * for catalog with oscillator circuits. Refunded on first order. 2400B Crystal Dr., Ft. Myers, FJ . 33901 The new Budwig...

Any Converter Now Only

301-X Your choice of any one input and output frequency between .6 ond 163 mc. (4-6 weeks delivery on custom converters) For prompt shipment please include postal money order or cashier's check. With personal cheeky allow 2 weeks to eiear the bank before shipment con be mode. COD's must include 20 deposit. New York City residents add 5 sales tax New York State residents add 2 sates tax. The model 301 uses 3 of the very latest type epitaxial planar UHF transistors for unsurpassed gain and low...

Atlantic Surplus Sales

250 Columbia St., Brooklyn, N.Y. 11231 Curl up in your hammock these hot days with twenty assorted fascinating back issues of 73. They'll keep your mind, imagination and soldering iron active through the sweltering weather. Our choice (but a good one) at this low price. 20 issues for 5. Get eight fabulous back issues of our choice for only 2, Individual back issues other than 1960 ones are 50*. 1960 issues cost 1. January 196 isn't available. All we've got right now are 1963 bound volumes....

Bnc Bnc Bnc Bnc Bnc Bnc Bnc Bnc Bnc Bnc Bnc N N N N N N

Right Angte Adaptci Right Angle Adapter Right Angle Adapter Tee Adapter (F-F-F) Straight Adapter Straight Adapter Straight Adapter Bulkhead Adapter (M-M) Receptacle (70 ohm Receptacle (70 chm Plug UHF (M) Plug Plug Plug Plug Plug Plug Jack Jack Jack Jack Panel Jack Plug 70 ohm) Jack (70 ohm) Panel Jack (70 ohm) Plug (70 ahmj Jack (70 ohm) Panel Jack 70 ohm)

Bracket Mounting

Meats in the circuit They are also used for locating resistors and other components within the splice, or simply to save time and work in the repair of defective coaxial cable. The transitions may be used for splicing two similar or dissimilar cables. Normally the tees and crosses are gaske ted for weatherproof operation while the transitions are non-weatherproof, Because of their importance in high frequency connector work, a considerable amount of experimental data on coaxial cable...

Broadband Ferrite Raluh

Mounting for Beam or DipoEe Nearly perfect characteristics are obtained toy the us ef low fim ferrite materials and special winding techniques. The transformer is completely encapsulated in plastic to assure freedom from moisture or shock damase. Model 601 is designed for a 11 ratio (50 ohms unbalanced to 50 ohms balanced) and the Model 601A is available for applications requiring a 4 1 ratio < 50-200 ohms or 75-300 ohms). Each unit is supplied with a UG5& A U (type N) fitting to provide...

Oi

Jt Schematic of the junk box preamplifier, Fig. Jt Schematic of the junk box preamplifier, any of them can be used in the circuit. Actually, almost any rf or if pentode can be used. The accompanying table lists tlie more popular types. Notice that only pentodes and not triodes are specified. Triodes can be used and, although they have a better noise figure, it is not needed on the hf bands. Phey also have a lower plate resistance which loads the receiver input circuit and reduces the...

Chicago Illinois

6450 Milwaukee Avenue Phone (312) 763-1030 The Best Deals (Trade or No Trade) on New Swan Equipment are being made at AMATEUR ELECTRONIC SUPPLY Ray Grenier K9KHW Mgr. Mail Order Sales Ray Grenier K9KHW Mgr. Mail Order Sales CHICAGO & ORLANDO STORE HOURS Mon, Wed. Th rs -12 to pm Tues & Frf - J2 to 5 30 pm Sat- 10 am to -4 pm To AMATEUR ELECTRONIC SUPPLY 4828 West Fond du Lac Avenue Milwaukee, Wisconsin 53216 7 1 am interested in the following new equipment I nave the following to trade...

Communication Crystals

PO BOX 2366 KANSAS CITY, MO. We do not usually think of the lowly resistor as having any special characteristics to give it personality, I arn sure most of you will be surprised, as I was, to find that the common carbon resistor is more than just a resistor. Did you know that it lias inductance and capacitance so that it has a self resonance frequency The capacitance between the granules of a composition resistor tends to cause the reactance and resistance to drop with...

Deluxe Semiautomatic

Adjustable from lowest to highest speed . . . smooth easy action 5 adjustments . . . separate height adjustment for pad dies. AM parts heavily chrome plated. Cat. No. 114-50 i Va contacts, STANDARD KEY-Heavy die cast base . . . adjustable bearings . , ''Cushion-contact offers smooth keying action, Vfe coin silver contacts.

Electronics

1000 50UTH B ASCOM SAN JOSE, CALIFORNIA Northern California' Most Complet Ham Store THE BEST VALUE WE HAVE EVER OFFEREDl wheel. We all were having a very fine time, and everything was going smoothly. Harvey was always looking for one of those stormy petrels, small birds that skim the tops of the waves, sort of following the boat, which according to him indicated bad weather was coming. So far we had not seen any of them, but we did see plenty of other birds. At times we saw a great many birds,...

Features

Mefer Indicator for monitoring finoi tuning, grid drive, modulation All tuning controls on the front panel Accessible components in the removable enclosure TV I suppression through shielding and design Compact size of 5x6x7 Low power consumption of 250-300 V at 75 ma Uses low cost 8 mc crystals * Silk screened panel 13 watts output. LKL 102-39 184th Street HoJIis, N.Y- 11423 the way, and Harvey saying look at that crazy cat Harvey first spotted the Island, and neither Jake or I could see it....

Female

R i at i r-i .'. ieL L h, m i J*i '. 5 s THE OHME MO OLTC COftDUCTQft t itHD frttECT** CMAPaCTf Hi , (i, m AiSEC T E E AAEClTW Wn.li Th .H PCilEn UMfr irswfl rn-iTi* rt -h tftfci.E 1 'Fi II i AIIH WALL t fltl Rf T+IF QUO CT' Di fr ' CT FEA'jffE GF THE QOJPLWK IE DE& lftMU TO -H - i ECT*M HSSi ' 4 > 0 - MATED 'rtEC OfLECTWlC IN T C TMALE CONNECT * IS SMAf TO fTT INTO T M LE S ca tc9WT nintvCD < f txst ocwevtors m* K USCO T ' P.flCC W

Grounds

Tail pipe ground at two points or more- heavy braid 0 Tail pipe ground at two points or more- light braid --------------------------- 1 Tail pipe ground at one point only heavy braid ---------------------- 2 Tail pipe ground at one point only light braid ----- 3 Tail pipe no ground 5 Motor block ground two point or more- heavy braid _________________________ 0 Motor block ground two point or more- light braid ________________- Motor block ground one point heavy braid 2 Motor block ground one...

H

RADIO AMATEURS REFERENCE LIBRARY OF MAPS-ORDER YOUR SET TODAY WORLD PREFIX MAP Full color, 42'' X 29 shows prefixes on each country . . . OX ones, time zones, cities, cross referenced tables postpaid 1.00 RADIO AMATEURS GREAT CIRCLE CHART S THE WORLD-from the center Of the United States Full color, 29 x J , listing Great Circle bearings in degrees for six major U.S. cities Boston, Washington, D.C., Miami, Seattle, San Francisco & Los Angeles. postpaid 1.00 UNITED STATES MAP All 50 States...

Uab

SERIES BN BN series connectors are small* 1 ightweaglit connectors designed for use with small cables such as RG-58 and -59 U. Actually, lliey might be called small-size N connectors. They may be used for video, if, and other low power rf applications. These connectors are not electrically matched or weatherproof, and therefore are not recommended for applications at frequencies in excess of approximately 200 mc unless the electrical requirements of the circuit are not critical. They may be...

Xxj

Name Call I Address Zip l New three band modification delivers the performance of your transceiver on five 200 kc band segments. In the last installment 1 was 011 tlie Seychelles, getting ready for my trip to the Aldabra Islands. You would be surprised to see the number of different things that have to be done when you are preparing for such a trip. For one thing the word had got out on Mahe that we were going to be on our way in a few days. Everyone who had any relations on any of the other...

Jl

Simply constructed matching transformers that can be used to feed a Bruce or Sterba curtain for single band operation. i decided to construct a Bruce arrav as best fitting into the space 1 had available* In my first attempt at construction of the array, I made all the elements from T x 20 stranded wire with insulators as necessary at the cross- over points between bays. Upon erection, however, I quickly learned that unless extensive rigging is used or a great number of insulators put...

Keep Line Volts Constant Automatically

Tiir-e K ilatoa, ALL AT LOW SURPLUS BARGAIN PRICES, hohl output Al 115 120 t d**pite line changes 95-130 and lud changcs 0 to full lf> ad. CV Tuned saturAlIng isolating traiL ormers hold U> 1 r c, hare 14 harmonics. EH smo, hold to 1 . ZERO harmon. S El Electronic, hold to 0.1 , 3 mix. barm. Sola, Sort risen, Superior Elecirie. CV 250 VA 22,50 500 VA 37.50 _1 KVA 59.50 2 KVA (230v) 99.50 S EI 500 VA 99.50 5 KVA (230v) 350.00

L L

. t I TI 4 * - State Zip or Country Parametric Amplifiers 2 n A TV Anthology 3 Care and Feeding of Ham Clubs 1 Revised Index to Surplus 1.50 Binders 3 per year 60 61, 62, 63, 64, 65, 66 Back Issues O, N, 0 1960 arc 1 F 1961 through present are Frequency Measuring, Coils end Ham TV ore out of print. Subscriptions take six to eight weeks to process. fed the array for one band operation using the matching transformer (a) in Fig. 5, SWR was not worse than 1.2 to 1 over the entire hand....

Liberty Electronics Wants To Buy For Cash

Mast any type or quantity Receiving transmitting, special ptirposet magnetrons, klystrons We will make you an immediate offer in cash. Surplus communication and test equipment AN GRC-3, 4, 5, 6, T, 8, 10, 19, 26r 21, 46, VRC-12 AN PRC-8, 9, 10, 25 Test equipment with ARM, SG, URM, UPM, USM, and TS prefixes Communications AN TRC-1, 24, 35. 36 Receivers AN APR-S, 13, 14, R-38BA, R-274, R-390A, R-391, etc. Indicators ID-250, 251, 381, 251A, etc. Aircraft AH ARC-2T, 34, 38, 44, 52. 55, 51, 13, 84...

Los Angeles California

Joe Willioms W6SFM 4 1 50 Beck Avenue North Hollywood, Calif. Photo by Paul Bailey. Build this simple MBT and put it to many uses. Ffg. I. Schematic of the toroidal muitiband tuner. LI and L2 ore described rn the text. Ffg. I. Schematic of the toroidal muitiband tuner. LI and L2 ore described rn the text. The advantages oi the 80 through 10 Meter Miniature Muitiband Tuner were detailed in the original article published in 73 for December, 1964. Here, the miniaturization is continued and the...

MALE

CUT END OF CABLE SHARP AND SQUARE STRIP JACKET 9 16 STRIP 5 Bw WHEN USING DOUBLE SHIELDED CABLE COMB OUT BRAID AS SHOWN STRIP DIELECTRIC 7 32 FROM END. TIN CENTER CONDUCTOR, TAPER SHIELD AND SLIDE NUT, GLAND AND GASKET OVER JACKET, INSTALL CLAMP SO THAT iTS INNER SHOULDER FITS SQUARELY AGAINST END Of CA0UE JACKET MAKE SURE KNIFE EDGE OF GLAW tS TOWARD END OF CABLE AND MATES WITH GASKET FOLD BRAIfJ BACK AS SHOWN AND TRIM PROPERLY. SOLOEft CONTACT TO CENTER CONDUCTOR AVOID ExCESSiVE HEAT SLJDE...

Mc

Advantage of both vertical and horizontal polarization. Turning radius only 1 4 ft. Lightweight, can be rotated with an inexpensive rotor or any manual method. Rugged, heavy duty, poly ethyl insulated support arms. Can handle In excess of 2KW. Bi-directional R,F, pattern with side attenuation of approximately 15.D.B, Does not require extreme height above ground. S.W.R. tuned at 14.275 1 to 1. No appreciable rise in S.W.R. at 150 K.C either side of resonance.

Meters

5QUALO is a full Half wave, horizontally polar-iied, amni-directionai antenna Outstanding oil around performance is achieved through a 360 pattern with no deep nulls. The square shape allows full electrical length in compact dimensions. Direci 52 ohm Redd Match feed provides ease of tuning and broad band coverage. The 6 & 2 meter Squalos have all parts to mount them on your cor roof new improved suction cups), bumper mast, QTH most, out a indow, or anywhere. The 10 thru 40 meter

N

adjust for oocscent collector c rflemt of 20rrl tctiil Fig. i. Schematic of VE2DG's simple two meter fransrnitter All of the transistors used ore inexperv sive. The unmarked Rf chokes ore ones suitable for the frequencies involved Z50 for the oscillator adjust for oocscent collector c rflemt of 20rrl tctiil

Ncn

Frequencies than the standard versions. For example, standard Type N connectors have an upper frequency limit of 3500 mc whereas (he improved version may be used to 10,000 mc, Captivated contact connectors were designed to keep the center contact in a fixed position within the connector. This type is recommended for cables using Teflon dielectric and Teflon or fiberglass jackets. These cables, although excellent for high temperature applications, are difficult to use because the inner conductor...

New

R-OLUNS MECHANICAL FILTERS 445D 31. 4b5 KC center frequency, 6 db bandwidth 3.1 KC, 60db bandwidth 6.5 KC. New 554.00. Our price 19,50 NATIONAL m 4 SL Multi-Band Tank, 3.2 to 3.0 mt and 12.0 to 34.0 mc for gn circuits of 20W input and final Plate circuits with 40 W input. 3,95 TELE* RELAY 115 VAC. 60 ey, 20 ma Half Wave 3 8 silver contacts, Beryl mm copper springs, P0T. Build yourself a simple six and two meter Amplifier 250W, for less than the price of a new 4CX25QB Ours are pullouts but...

News

Springtime is mobi e Ucheck-up time Below is a check list to evaluate your Amateur mobile antenna installation. Circle number under each of the 5 categories which best describes your installation. Total these numbers and subtract the sum from 100. The balance remaining is your rating. Scores are listed below. This check list may also be used for new installations. Install your mobile antenna according to the lowest numbers and you1 II get the best performance from your equipment.

Nom International

DKLA 731Q2 Imitation is Hie sineerest form ol * - . A note in K2MGA's editorial in the June C3Q states that CQ is dropping its VHF, Novice, Club Forum, RTTY, YL and Space ( onimunicatioiis columns. Reason given To make room for more current items of more general interest ' Speaking of CQ the same editorial makes izleeful note of my statement in the May 73 that we do not have the stall here to answer technical questions from readers. The truth of the matter is that we try to...

Notes

C - 25- 5Qpf FROM ARC-5 140-124 pi RANGE USED L* lAArf SINGLE LAYER ON CERAMIC FORM (PREFERABLY PHOSPHOR-BRONZE WIRE) * - SlLV R,2ERO TEMPERATURE COEFFICIENT V* BREAK HERE IF INCREMENTAL OR CALIBRATION TUNING JS WOT DESIRED Fig. 1. Digital readout VFO for 5,0-5.5 MHz. amateur gear. 1 have tried the ARC-5 capacitor over other frequency ranges with equal success. The choice of parameters for the linear circuits is based on an unpublished method developed by W9TO, of keyer fame* It is hoped that...

Ohler

The new Heath HD-15 Hybrid Phone Patch provides swift, efficient coupling of your equipment to the phone lines. It includes complete facilities for the monitoring and control of transmitted and received signals with separate controls for receiver-to-line and line-to-transmitter audio levels and a panel-mounted VU meter. This new patch matches 3-16 ohm speaker circuit and high impedance transmitter input circuits to the 600 ohm telephone lines. The hybrid circuitry permits use with VOX...

Peter W Dahl Co

Minneapolis, Minnesota 55414 * Price 2 per 25 words for non-commercial ads 5 per 25 wards for business ventures. No display atfs or agency discount, include your check with order, Type copy. Phrase and punctuate exactly as you wish it to appear. No all-capitol ads. ir We will be the judge of suiability of ads. Our responsibility for errors extends only to printing a correct od in o later issue, ic For SI extra we can maintain a reply box for you. -fc We cennot check into each...

PIV

TO TUBULAR UECTROlYTlCS, INFRA-RED PHOTO DETECTOR TRANSDUCER fNFRA-RED PAPtABOLiC REFLECTOR a FILTER 40 WORLD'S SMALLEST COND. to ,05mf 4 TRANSISTOR TRANSFORMERS, worth i25 2 CLAIREX PHOTO ELECTRiC CELL, CLfiO S25 RELAY SURPRiSE, - Iwil, liny types 3 INFRA-RED DETECTORS, with lends 25 SURPRISE PAK- i r nsislora, rect, diodes, etc. 40 PRECISION RESISTORS, 1 a. 1.2W lft values 30 CORNING LOW NOISE resistors, asst. . , 60 TUBULAR CONDENSERS, to .r> mf, to IKv, asst 40 DISC CONDENSERS, 2Tmmf to...

Plug Body

J rj trt fft CUT END OF CABLE SHARP AND SOU ARE STRIP CABLE JACKET t9 64* FOR RG-5B U OR 5 6* OR RG-59 U COMB OUT BRAID AND FLARE AS SHOWN STRIP CENTER DIELECTRIC 1 8 TAPER SHIELD AND SLIDE NUT, WASHER, GASKET ANO CLAMP OVER 8RAJD. CLAMP IS INSTALLED SO THAT ITS INNER SHOULDER FITS SQUARELY AGAINST END OF CABLE JACKET WITH CLAMP IN PLACE FOLD BRAiD BACK AS SHOWN AND trim 1 12' FROM END, SLIP CONTACT IN PLACE, BUTT AGAINST DIELECTRIC AND SOLDEW REMOVE ExtESS SOLDER...

Plug Dy

Cut end of cable sharp and souare strip cable jacket 9 32 comb out brato as shown cut off cable flush i o from end of jacket tin center conductor taper shield and slide nut, cl-mp and gasket over jacket install clamp so that its inner shoulder fits squarely again5* end of cable jacket fold bra d back as shown and trim properly. solder contact to center conductor, avoid excessive heat slide assembly jnto connector body face of electric must 9e flush against insulator make sure sharp edge of...

Plug Suassemsly

BARE b 8* OF CENTER CONDUCTOR TRIM BR AO AS SHOWN tin CENTER CONDUCTOR AND EXPOSED BRAID SCREW plug SUBASSEMBLY ON CABLE SOLDER BRAfD THROUGH SOLDER HOLES SOLD Eft CENTER conductor, 00 not use excessive heat SCREW COUPLING R m ON PLUG SUBASSEMBLY. Fig. 12. Series UHF assembly instructions for Arnphenol 83- SP. Coaxial connector assembly group charts The 1 Coaxial Cable Assembly Croup ( harts in Tabic 8 are useful in selecting coaxial connectors for various size coaxial cables. The first part of...

Plug Subassembly

STRIP CABLE JACKET I -l S HAGE Vfl' OF CENTER CONDUCTOR TRIM BRAID AS SHOWN TIN CENTER CONDUCTOR, SCREW PLUG SUB-ASSEMSl V ON CABLE. SOLDER BRAID THROUGH SOLDER HOLES SOLDER CENTER CONDUCTOR, DO NOT USE EXCESSIVE H ATt SLIP COUPLING RING QVE* PLUG SUB-ASSEMBLY, ALLOW SUFFICIENT CLEARANCE TO PERMIT FREE ROTATION Of COUPLING NUT AND TIGHTEN SET SCRtW Fig. 13. Assembly instructions for UHF series UG-203 U.

Po

Ronald Vaceiuke W9SEK 17 W 540 Hillcrest Wooddale, Illinois Simplify your experimenting with this handy instrument. How many times have you wished that you had a small bench amplifier I know of many times in the past that 1 have had to use earphones and a blocking capacitor to check audio circuitry just because of the fact 1 didn't have an audio amplifier on the bench. But not again finally made my mind up that I would do something about it and thought 1 would pass this along 2. A relatively...

Price Breakthrough On Beams

FULL SIZE new) eoin jUjic witli boom anil hardware SWIt 1 1 handles 5 KW adjustable entire band and 1 alum, alloy tubing eoftxiitl foed 3 El 20 22,00 3 El 15 16,00 2 El 20 16.00 2 El 15 12.00 4 El 10 1S.Q0 4 Ef 6 15,00 ALL BAND VERTICAL V100 16 thru 1601 1S.95 QUADS Ni W NEW-1 ALL METAL (except insulators) Cubical Quids El fuli size complete with boom, ft LI hardwire terrific gain and di tivily best qUad ever mink no bamboo 20 meter 25 15 meier 24 remit with order flapped esp. roll. GOTHAM 18Q5...

Professional Hifi Condenser Microphone

Hntml in w f 4.35 t))fiUle only, bm include wg of Pjtra-nii-iJtit Picture's ml iijdi follower preuinp using on j batteries, 3 rotors, 3 capacitors, 1 5718 tube. Mflfr's i ccs 1 dl from DC 12' j iiMililc hryrnKl kc 25 pf -75 db across load for Hi bar si Ttal ai int) v poUrtal ii will work past 17ii fjlxfi wifJ stund 200 fl shock ' Un directional. Siw Will fit, in 1 nr circle 7.* thick OA, WHILE THEY LAST, I'& fftpaid, only 27,50

Price

MODEL B-IOOOA 435 Complete THE PRICE is considerably less than o linear amplifier and look at what the B-1000A does for your station performance. If you already use a linear on your set, and add the B-1000A WOW GET ON OUR LIST for early delivery Place your order now Please send check or money order. DO YOU WANT more information A NEW TECHNICAL DATA PACKAGE IS AVAILABLE AT 52.00 A SET, Contains complete B-1000A circuit diagrams, a circuit discussion installation and operation, parts lists,...

Push Swttcw

Hams are supposed to be knowledgeable people at least concerning radio. It always puzzles me then, particularly as a dealer in ham equipment. to find so many examples of people hams, thai i> who otherwise fail to understand the significance of what they have read. Now, am not Irying to carp or to ridicule anyone. That would be an inconsistent gesture from someone who is trying to make a li ing in ham radio. What f am trying to do is to make more of you aware of the need to understand what...

Pushon Connectors

, u . ,r jVJTh UAJ. i i COA lAi lE tfflNiCfllTp LOW-W*Efl T-,0'.' UP TO ISO Mi THE1 . CONNFCTl y RE ECONOMICAL A NO It S-EU .E, Fig, 8. Cutaway drawings of series LT, N, UHF, BNC QDS and push-on connectors. double flat requiring a special hole in ihe panel or a bent tab on the connector requiring 1 notched hole in the chassis. W hen large thick chassis are used, the connector may be screwed into, press fit or soldered to the chassis as desired. While steps have been taken in all of the more...

R

hart together with an educated opinion about the anticipated size of the anode resistor locates the quiescent point which in turn locates more exactly the grid to cathode voltage. The cathode must he positive with respect to the grid. So the required bias voltage is added to the previously fixed grid voltage, which gives die cathode voltage. The cathode voltage is divided by the cathode current to obtain the size of the cathode resistor--and there you have it. With this resistor in place, the...

Rcadside

Horizontal directivity patterns (on y half shown,) That is, as the antenna is made longer by the addition of correctly phased half-wave sections, the horizontal pattern (Tig. 2) becomes sharper and sharper. The vertical directivity (Fig- 3) remains, however, essentially the same as a half-wave dipole* Note what ha ppens with a curtain, t achieves gain mainly by vertical directivity. That is, its horizontal pattern remains broad but for the elevation shown in Fig, 3, for instance, its...

Rjght Angle Adapter Ugaj

Need ior a small rf fitting for use with coaxial cables of Ji inch overall diameter and smaller. They should not he used where electrical matching is required, SM connectors are considerably smaller and contain fewer parts than the BNC series for simplicity of design, they employ a female contact 011 the plug and a male contact on the jack and receptacle. The SM series has the advantage of positive braid clamping and does not use the inner conductor of the cable as the center contact. These...

Rush Your Order Tod A Y Qtys Limited

Mica Condsr.006< S 2500V 4 il Mini-Fan 6 or 12Vac 6D Cys 2 , 3 5 4X150 Ceramic Loktal 1.25 (a , 4 J2 Line Filter 200Amp 130VAC 10 , S 50 DC V z Meter RD 800Ma 4 (a f 2 7 DC 2 Meter RD 100Ma 3 (a DC ZYi* Meter RD 3QVDC 3 , 2 5 DC 4 Meter RD tMa 5 (< * t 2 i9 WANTED LAB METERSt BRIDGES Modulation Xfmr 60W 15K to 5,7K 5 Socket Ceramic 1625 Tube 4 il, 10 2 Socket Ceramic 866 Tube 4 H, 10 2 Socket Ceramic 4X150 Loktal 4 S2 WANTED YOUR ORDER - TO DA Y 2.W H PiWound 500Ma Choke 3 for 1 Terms Min,...

S W R Field Strength

California resi dents include 4 sales tax. An excellent combination unit for either home station or moblite use as an accurate Standing Wave Bridge and a sensitive Field Strength Meter. 52 ohm impedance. Will take a full kilowatt and can remain in the line all of the time. Grey metal case, SW* H x 1V4W x D, with standard fittings, lVs Bnghr-vue meter, and detachable, telescoping antenna which extends to With instructions and schematic.

S

Smaller by far than ANYTHING in its Power Class-5xl I ' xlO Only WRL can make an offer like THIS I Thousands of Amateurs told us what they wanted, Power to make good contacts a Selective Receiver, Stability- a unit adaptable for either Mobile or Fixed Station use- They added that the unit must be compact-.-and that the price must be right Quite an order Yes, it was . , yet you'll find our Duo-Bander 84 not only fills these tough requirements but gives some extras to boot 300 Watts PEP SSB *...

Series Hn

SERIES HN Series HN connectors are medium-large weatherproof connectors for the same size cable as series N, The difference being that the dielectric material is tapered to permit their use at higher voltages. The latest version of these connectors employs a step design in lieu of tapering the cable dielectric. These connectors have a nominal impedance of 50 ohms, screw-type coupling and metai-to-metal braid clamping in standard, improved and captivated contact types. Series HN connectors were...

Series

SERIES TNC Where in previous years great emphasis was put on case of connection, the advent of high speed aircraft and missiles with their inherent lv stringent environmental requirements forced a return to the more positive vibration-proof threaded coupling. As a result the TNC series was created. Originally merely a threaded version of the BNC series prescribed for moderate frequency applications, increased usage at elevated frequencies through 10,000 mc has required manufacturing techniques...

Series Lclt Lc

Connectors are large-size weatherproof, 50 ohm connectors for RG-17, -IS, -19 or -20 U coaxial cables employing screw-type coupling. They are intended or hi h power rf transmission up to 1000 mc. A jack was not originally designed for this series and it until the early 1950Ts that one was Two groups of LC connectors are available group LC-1 which will withstand peak voltages of 500 volts and the slightly larger LC-2 which will withstand voltages in excess of 10,000 volts. Where it is desired to...

Series Lclt

SERIES LN The series LN connectors are essentially nothing more than an oversized N*' connector or i gi nal Iv used with the larger rf cables such as RG-14, -74, and -94 U. These weatherproof connectors have a nominal impedance of 50 ohms and an approximate peak voltage rating ot 1000 volts, This series has been replaced by two plugs, UG-204A U in the N series and UG-494 U in the HN series. Consequently, very few LN connectors are found in present day equipment.

Series N

SERIES N Series N connectors are recommended where a medium size, weatherproof connector with a screw type coupling is desired and it is one of the most widely used series of connectors. They are general purpose connectors with constant impedance characteristics and may be used in 50 ohm circuits employing medium sized cables such as RG-8, J. However, when matching requirements are not critical, they may also be used with larger or smaller cables. The original Series N design used a polystyrene...

Series Nc

SERIES BNC This small connector design is probably the best known series in use at the present time. It was the first reliable quick connect and disconnect series all the other connectors in early use used screw coupling- The bayonet coupling permitted rapid connections to be made and as such t hey made a tremendous hit in the test equipment field. These connectors are similar in size to the BN series but efectrieallv thev are greatly improved original designs showed them to have an SWR of LIS...

Serres N With Captivated Contacts

Cut end OF cable sharp and square strip cable jacket comc1 out i3raid shown cut off cable slide nut, gasket and clamp over jacket. install clamp so that its inner shoulder fits squarely against end of cable jacket. fold hraid sack as shown and trim properly. slide on washer, rear insulator and contact. able corf, insulator and contact shoulder must butt as shown. solder contact to CEmtfr conductor av0> d excessive heat. sl> de front insulator over contact be sure to place counter bored end...

Shack

Your call attractively displayed, inside or outside. Lasts for years. 2ya x 17 inch, custom mad fully guaranteed distinctive design of quality rust proof aluminum, finished in rich, black enamel. Beaded, Reflective, Raited fettering. Door or Wall mount (pictured) 1,45 Mailbox, Lawn stake or Post mount, with attractive aluminum frame (view from ertherside) state type with order

Sprague Suppressikits For Vehicles With Alternator Systems

Honk Olson W6GXN 3780 Starr King Circle Palo Alto, California Most secondary frequency standards for amateur use fall into one of three categories I hose producing 10 kHz-spaced marks, those producing 100 kHz-spaced marks, and those producing 3.5 MHz and harmonics. The first type is represented by an article by Campbell, wherein a 100 kHz crystal oscillator is used to injection-lock a 10 kHz free-running multivibrator.1 Ihe second type is that found in most commercial H.F, receivers as the...

Subminiature

They are rated at 1500 volts RMS at sea level The method of cable clamping is a wedge type device that when used with RG-59 U type cables, provides a minimum cable retention of 45 pounds, SUBMINIATURE Because of the tremendous number of sub-mi n i a t n re coi 11 lectc > r s manufactured by the various connector companies, it is impossible to cover all of them here. I he inset drawing is just representative of the many varieties available. The majority of...

Super

High Power Capability Capable of maximum legal limit on SSB. Widest Bandwidth Better than ever. . . maintains minimum SWR over phone portion of 40, 20, 15, and 10, - 60 KC wide at 2 to 1 SWR on 75 meters. > Low SWR 1.1 to 1 or better at resonance no special match- ing required. Proper Base Impedance Nominal 52 ohms at resonance no magic lengths of feed line or matching devices required. Low Frequency Drift Frequency drift from heat held to absolute minimum. Here s 413 reasons for exceptional...

Tab

''VOLT-TAB 1000 Watt Speed Control 115VAC jlO _2 for j 9 W,E. Polar Relay 255A 5 (a W.E. Socket for 255A Relay, Toroids 88Mhy New Pckg St Ut 6.3VCT (a 15.5A & 5.3VCT to 2 for i8, 20 for i60 200 KC Freq Std Xtals 2 ( ( Printed Ckt Bd New Blank 9x12 il 4u Klixon 5A Reset Ckt Breaker 1 f< T 10 S5 2K to 8K Headsets Good Used S3 f 2 S5 finished Xtals Asst Types 20 for il Battery Charger 6& 12V Charges up to 5 Amp Approved Heavy Duty Design with Klixon Circuit Breaker. Operates 220 or 110 VAC...

Th Edition

Most comprehensive how-to-build-it source * Problem-solver for designers & builders Completely revised and enlarged by William I. Orr5 W6SA1. This is the comprehensive communications manual which is the industry standard for electronic engineers, technicians* and advanced radio amateurs. Explains in authoritative detail how to design and build all types of radio communications equipment,

To Tranmtur

See the text for choice of components. In Fig. 1, Kj is a sensitive relay, such as the Sigma type 11. Select a relay that will operate on one-half the available supply voltage, or less. With R2 disconnected adjust Rx to just barely pull KL in. Select R2 to cause to hold in once it is manually closed but to allow KT to remain open when manually opened, CA is a small electrolytic selected so that when Si is depressed then quickly released, Kx stays closed. Kj is now...

Transistors

100 Asst for 2.50 Postage Paid In USA. No CO.D. 404 W 38th Street, Wi m nqton, DeEoware 19802 3600-0-3600 VAC & 1000 Ma., CCS, with 120 240 VAC 60 Lps primary. Commercial n lity Emits m arm fact iirert hy Wasiner Electric Co. measure 13 high, 12 wide, and 9 deep, Net weight Is Prir.e 39,95 F.fi,3. Minneapolis. One unconditional mnncy back ijimranUe. Terms Cheek ur M 0, with order Imihidiate delivery. Write or Phone

Tv Camera

PERFECT FOR HAMS, EXPERIMENTER LOW BUDGET INDUSTRIAL APPLICATIONS. FINAUY A TRANSISTOR CAMERA KIT SELLING FOR UNDER H ,Q0, THiS 1 LESS THAN THE COST CIF ANY OTHER i VTIO ALlv ADVERTED CAMERA EITHER TRANSISTOR OR TUBE ' & UT DON'T BE FOOLED (NTO THINKING WE'VE SACRfFlCtD QUALITY FOR ECONOMY, WE HAVEN'T iT'S PERFORMANCE ILL DEUGKT YOU* S& m* at fin DiiUiqndim fiiihjrti inclwdf ' 5 in air piece pdnfad ciPcdif board for Irouble-frtt h yH J 6 iton kipb flam, ic- f o m srsp. ' SfIhcttntoirnd...

Two Categories To Choose From

Standard Duty Guyed ir* Height of 37 - 54 - S - 105 and m feet Heavy Duty Self Supporting and Guyed in Heights af 37-54 fetl (SS) 71 88 feet (guyed Ease af Operation roller guides between sections assure easy. safe, friction-free raising and lowering. Strength welded luhular steel sections overlap 3 feet at maximum height for extra eturdiness and strength. Unique HOHN raising procedure raises all sections together uniformly wil h an equal section overlap ul all heights Versatility designed lo...

Two Meters

Eight element widely spaced on a long boom mean high gain. Punch out a signal that con reolJy be heard. Hear stations that you never heard before Ruggedly built of high qua itv aluminum re withstand high *-nds. 52 ohm march. Want to 'eaiJlv knock Ihetr ears off Stack 'em. Two 28BT's with stocking kit and phasing fines 43 95 PPD m continental USA. A real DXer's beam. Eight element widely spaced on a long boom mean high gain. Punch out a signal that con reolJy be heard. Hear...

Type Sk Suppressikit For Vehicles With Dc Generators

Designed for simple but effective insloliafion. The generator capacitor is built for continuous heavy duty 257 F (125 Q operation. A full 60 ampere current rating plus the high rated operating temperature provide an extra factor of safety against expensive generator burnouts, unlike many suppression assemblies containing general-purpose capacitors. Effectively suppresses RFI through 400 mc. Includes easy-to-follow installation instructions.

Ug

Size, many of these eonaectors are usable up to 3000 inc. Typical of these connectors are the Sub M in ax series by Amphenol, the BSM and MTM series by Automatic Metal Products and the OSM connector made by Omni Spectra, Inc. PULSE Several varieties ol connectors have been developed for high voltage pulse applications, particularly for radar. The pulse connectors with ceramic inserts are divided into two groups known as types and B, The Pulse A connectors are widely used on U. S, Navy aircraft...

Ug U Ug A U

Insulation 3 8 Thread Mounting 3 8 Thread Mounting 7 16 Thread Mounting 1 , 2 Thread Mounting Flange Table 3B. Miscellaneous series BNC connectors. Straight (M-M) Adapter, Tee F-M-f ) Cap and Cham 1 M) Cap and Chain F Receptacle, Bulkhead Receptacle, Bulkhead Receptacle, Pane UG-642A U UG-566A U UG-1 1 42 U UG-1 143 U Va Thread Mounting Presusrized Table 4B. Miscellaneous series C connectors. Fig, 7, Typical coaxial connector VSWR. Table 4B. Miscellaneous series C connectors. RG-5 U RG- U RG-8,...

Ug U Ug U So

Table 6B, Miscellaneous series UHF connectors, of the more popular coaxial connectors at frequencies up to 11,000 mt These curves are based on actual laboratory measurements of improved versions of connectors properly assembled to RG-8A U cable except for the BNC connector which was RG-58 U cable. The non-constant impedance UHF series is shown for information purposes only, but it becomes quite obvious why this connector is not recommended for use at frequencies above 200 mc, When selecting...

UG U

Improved Type Captivated Contacts 70 Ohm Connecters Tobte 5A. Coaxial connector selection guido for serres N PL-259, PL-259A, UG-295 U UG- 75 U adater to PL-259 UG-73 U, UG-tlt U, UG-203 U SAX-543 U, MX-372 U JG-1 77 U, MX-539 U JG-239 U, UG-366 U Table 6A. Coaxial connector selection guide for series UHF. Table 6A. Coaxial connector selection guide for series UHF. Tec (F-M-F) Cap and Chain Receptacle Receptacle Receptacle Receptacle Receptacle, Right Angfe

Ac Or Dc P

Simple audio oscillator operating on 6 or 12 V. Fig. Simple audio oscillator operating on 6 or 12 V. 6 volt filament transformer can be mounted inside the case and J2 can be eliminated. Power is fed in thru J 2 using different cables for 6 or 12 volts. While the same cables are used on either AC or DC the cable is color coded so that when using on DC Mie proper polarity is maintained. The tone output of this unit can be varied from around 20 Hz lo around 12,000 Hz. The upper limit can be...

Esk

TAPER SHIELD AND SLIDE NUT, GASKET ANO CLAMP OVER BRAID PUSH CLAMP AGAINST JACKET TIN CENTER CONDUCTOR FOLD BRAID BACK AS SHOWN ANO TRIM TO PROPER LENGTH SLIDE ON BUSHING, REAR INSULATOR AND CONTACT THESE PARTS MUST BUTT AS SHOWN SOLDER CONTACT TO CENTER CONDUCTOR* APPLY MINIMUM HEAT SO CENTER DIELECTRIC IS NOT HEATED EXCESSIVELY AND SWOLLEN, THEREBY PREVENTING ENTRANCE TO THE CONNECTOR BODY,

Wgxn

1 Campbell, A Junk Box Frequency Standard * QST, Jui> , *fi4, p, 22. 2. Crosby, The HBRifi - QST, October '59 P, n 3. Grijzg1 A Transistor Secondary Frequency Standard QST, July p. 11, 4. Olson, H,. Crystal Oscillators, Tube, Transistor, ami FET 7 1. Mart-h lUfifi, 14, This simple code practice oscillator also is handy for checking transistors and supplying an audio tone for testing equipment, fU adjusts the frequency of oscillation, which will also be affected by the transformer used for TV...

Write Now For Monthly Flyer

115V-350 WATTS AC 12Vs lb< GAS ALTERNATOR Enough power to operofe any popular 558 xmittr plus separate DC output to charge 6 and 12 volt batteries. Great for vacations, field days, campers, boats, etc. May be used power tools, tv sets and many other uses. Thousands have been sold to US and foreign govts., armed services, police depts. etc. Fully guaranteed. Algert Sales Co, 805 Wilfhire Blvd., LA,

Wsfm

Finest Communication Arrays in the World Precision-Tuned-Matched and Balun Fed for Balanced Pattern'1 to assure TOPMAN-ONTHE-FREQUENCY Results You, too can enjoy World renown TEL REX performance and value Send for PL67 tech data and pricing Catalog, describing the World's most popular communication antennas, rotator-selsyn-indicator systems and accessories Expanded data sheets, including your favorite band, also available.

Introducing The Transkey

The new Trans-Key (TM) is a new development for ham radio by licensed hams. A highly sensitive relay driven by 3 blocking oscillator offering variable speeds from a few words to 50 wpmN is but one interesting feature This eliminates worries about voltage polar ity or potential. The keyer and accompanying monitor are both penlight cell powered or an external 6 volt source can be used. The key contacts are adjustable. A single switch on the back changes opera* tion from automatic (self completing...

Sale

He Tristao Tower Company has just announced a new cranlc-up tower tiiat is especially suited for tlie ham with a problem installation the operator who wants his antenna 60 feet in the air but has little or no room for guys. The new Tristao CZ-454 tower is attached to a building 10 or 15 feet above the ground and has sufficient stiffness to support an average tri-bander beam when fully cranked up. The diagonal steel bracing and heavy channel step bracing provide the strength to withstand strong...

New Products

Tuck Model 103 High Frequency Exciter Tuck Electronics has just announced a new series of solid-state high-frequency exciters that provide 2 watts output over a frequency range from below 1 MHz to above 30 MHz without tuning. Although the Model 103 illustrated above has a two position crystal oscillator, other models are available with up to ten crystal positions. For the RTTY enthusiasts a special crystal oscillator is available with provisions for frequency shift. Complete details on this...

Translab

Sin Diet , Ctlif. 92102 Reduces Interference and W For ALL Amateur Transmit- Noiu on AM Males Short j ten. Guaranteed for 1000 Wave lietelwi. Makes World Watts AM 2000 & SB PI- Wide Reception Stronger. Met or Link Direct Feed. Clearer on All Bands Light, Neat, Weatherproof, Complete as shown total length 102 ft, with 96 ft. of 72 ohm balanced twinline. Hi-impact molded resonant traps (Wt 3 oz+ 1 i 5 baa). You just tone to desired band far teamlike results. EUcelteut for...

Bigk

1000 watt (p.e-p,j mobile intenna at a mini-power price Quick-connect high power inductors for 160*80-4020 15-11-10 meters have exceptional figure of merit MQ measures 230 on 30t rises to 3S0 on 15 meters Webster Invites comparison of ttili sky power antenna particularly its high efficiency space wound coils, suspended -not molded -inside a protective alE-white housing. Also compare the precision-machined hinged column assembly that releases coil whip tor right-angle lay-down. Lockup is fast,...

Kva

EM 6 KVAt 279.50 IncL Gen RadfO 1570AL EMT transistorized 28 KVA 230V . 350.00 ALL-BAND SSB HCVJt BARGAIN 11 all Icrafters K-15 AHR-7 55U kc. to 43 rnc rnntiimous. Voice, rW. MCW, Jilted, grid. W book 2 RF. 2-IF's. i gt -mHer nuts tmtr 3 jell, 3 uon-itl aelectiTitf choices, 140 cn Lese pwr sply 60 ey pwr sply 30, SSB produrt ilclt lor 20 TIME PAY PLAN Any purchase Uit.nl I n i n0 mure, down payment only . H . IU h DZ'X superhet revr 15-70 amp 100 1500 kc. . . 89.50 RAK-7 TRF revr w pwr sply...

A

Here's a simple, inexpensive transmitter for the beginner on 220 MHz Output is only half a watt, hut that can work a good distance, Inexpensive, low power transmitters have gained popularity through proven performance on 6 and 2 meters. Why not find just how little is needed on 220 MHz I thought- Perhaps it was a foolish I bought for many failures followed. The llA meter band borders on UHF, This tends to complicate circuitry. Tuned linos were not considered for the tuned circuits, hut it...

Technical School your Ham Training

Whether or not incentive licensing becomes the law, there are many amateurs who would like to improve their knowledge, either to get a higher license for the satisfaction of it, or as a means of entering the elect onics field. Novices and Technicians could find the way to General class licenses more easily by the formal training method, especially where they have no local hams to help them. Alexander Hamilton Institute 235 East 42nd. St. New York, N.Y. 10017 American Institute of Engineering...

The Chicken Method

Many articles have been written over the years extolling the virtues of some new tube or circuit application to improve existing equipment. The reader is often told in glowing terms how changing tubes in the frontend of his receiver will boost the signals so many Sw units or that the DX signals will really pour forth. On-the-air contacts will boast such changes with authority to all who will listen. Some tube and circuit changes that have made the rounds are well engineered and should be...

Five Bands Watts

So often when thinking of investing in a mobile rigf the thought occurs that it wilt have to be a cheap outfit, without many of the excellent features of the home station. Can't afford two rigs like the home station, you say This may be true, but when you have the combination that is designed for the job, the home station can be the mobile station, toor and the changeover simply a matter of moving the transceiver and VFO from the house to the can The SWAN 400 and its components fit together...

Parametric Amplifiers

I,- lt lt V' Ii, 4- 11 - - - y Is your VHF converter noisy Are you interested in working moonbounce on 432 How about OX on 1296 or 2300 If you're in the forefront of VHF and UHF developments, you are probably working well into the noise of your receiver. Even with many of the recent low noise transistor developments, short of a maser the PARAMETRIC AMPLIFIER is stifl the only way to get realty low noise figures above 300 MHz. PARAMETRIC AMPLIFIERS is the only book written explicitly with the...

Cau Direct Use Area Code

Butter 1, Missouri 816 679 3127 11240 W. Olympic, Los Angeles, Calif. 213 477-6701 931 N. Euclid, Anaheim, Calif. 714 772-9200 6116 N. 27th Ave., Phoenix, Ariz. 602 AM 4-3895 Worlds Largest Distributors of Short Wove Receivers External view of WA9AXX's digital readout VFO. Borje Ost WA9AXX T 526 Potter Road Park Ridge, III, 60068 External view of WA9AXX's digital readout VFO. Borje Ost WA9AXX T 526 Potter Road Park Ridge, III, 60068 It is desirable in tuned rf oscillators to have a uniform...