I I I I I

Liy the definition of the animal, an alternating current is one which flows in one direction for a while, then reverses itself and flows back the other way. Quite naturally, the voltage connected with this current rises to a peak, drops back through zero, and reaches an opposite-polarity peak, following the same cycle. And it's almost insulting to remind you that tIiis doesn't happen simultaneously at every point along a wire when the voltage, for example, is at a positive peak at point A, then...

Way Company

SATISFACTION GUARANTEED 1147 Venice Blvd., Los Angeles 15, Calif. PLASTIC GUY LINE Braided Polyethylene will meet alt your requirements for a non conductive all-weather guy line. Special construction allows easily adjustable loops which are self tightening under tension. Replace your rusty wire kinys with ibis material and never bt lathered with guying problem again. Semi 25c for sample and complete iletalls. 1 4 1000 lb. test 4c foot Check or M.O. to 5 16 1400 lb. test Sc foot nvonw aidoadi 3...

Meter

ARC-1 Navy Surplus Transmitter Receiver Xmti uses 832A in final, 20 watts hi put, with AM push-pull plate modulation. Ten crystal controlled channels. Freq range 100-156 Mc. Receiver has extra, separate gnard channel which can he timed for your net frequency. Complete with tubes, schematic diagram, and conversion instructions for AC power supply and tunable oscillator. Shipping wt, f> 0 pounds. Used good. S29.95 lis volts, 60 cycles input, Including transformer, silicon rectifiers, punched...

Address

Lu addition to eliminating all the confusion brought about by the various definitions of regulation ' the source resistance concept lets us estimate quite closely what the output voltage of a supply will be if we know the amount of current it is furnishing. i or instance, in a capacitor-input power supply or in a choke-input either, for that matter with not even a bleeder load the voltage at the output will be very nearly equal to the peak value of fie ac applied to the rectifiers. All we need...

Info

Setting of loading control in percentage of rotation, for example discussed in text. Note wide deviations. To drive it home still more, move on to Fig. 7 (the last of our little charts). This shows approximate percentage of rotation of the loading capacitor, with 100 percent equal to maximum capacitance* It's figured for our 2500 ohm pi-net, the same as everything else we've talked about, and for 7 mc operation using a 3-gang BC variable for C2. Now we find that if the coax happens to...

Typical Operation

115V, 50 500 cps DC Isolated from DC ta AC Inverter Variable Wavs AC to AC Power Power Line and Changes DC Shape and Supply with Tapaz free from Common Voltage (0 Noise Square Wave AC Voltage Controller and Filtering Circuitry Sme Wave Output of Steady. Uninterrupted 1 KVA Power at 117 uol1 > 60 cps 03 cps RESULTS Clear Television pictures without jitter or tearing 115V, 50 500 cps DC Isolated from DC ta AC Inverter Variable Wavs AC to AC Power Power Line and Changes DC Shape and Supply with...

Two Categories To Choose From

Standard Duty Guyed in Heights of 37- 54 - 88 - 105 and 1 22 feet Heavy Duty Self Supporting and Guyed in Heights of 37 - 54 feet (SS) 71 _98 feet (guyed) Ease of Operation roller guides between sections assure easy, safeT friction-free raising and lowering Strengih welded tubul r steel sections overlap 3 feet at maximum height for extra sturdiness and strength. Unique R HN raising procedure raises all sections together uniformly with an equal section overlap at alt heights Versatility designed...

W

. MOST POWER OUTPUT Of ANY 3 BAND TRANSCEIVER TODAY1 2. SMALLEST 300 WATT SS CW TRANSCEIVER. 6 x 10 x 11V4 - 14 lbs. Makes it best Mobile - Fixed Station. 3. FULL COVERAGE ON 80-40-20 METERS. 4. SSB UPPER & LOWER SIDEBAND. SHIFTED CARRIER CW. The only 3 bander with these features. 5. BEST FILTER AVAILABLE. Suppression better than 45db, unwanted SB 55db. 6- NEW f> SECTION CRYSTAL FILTER. Exceptional- 1,8 IC 1 shape factor at 2.1 KC bandwidth. 7. HIGHEST RECEIVER SENSITIVITY, Vi Mv for 10 db...

That Rare Combination

To be or not to be, that is the question. Or where do we go from here. his subject of an Amateur Radio headquarters and our man in Washington is not a new one. It's as old as Amateur Radio, Old issues of QST and minutes of AARL Director meetings make interesting reading on this important subject. It seems that displacement of people and sentiment as to where we started have been key issues in the past ''he importance of location has been secondan to us, yet most of the prominent and important...

Institute Of Amateur Radio

The Institute needs your help to achieve its objectives the promotion of amateur radio among our own government agencies and Congress to assure us that the services we perform and the benefits to our country are known where they will do us the most good. This cannot but help us also when delegates from our government agencies are with us in Geneva, when we will need every friend we can get. The Institute will also start an international lobby to acquaint foreign governments and officials with...

Single Pole Three Throw Coaxial Switch

Weatherproof coaxiaJ relay for remote switching of r.1. sources. Designed for mounting on mast and remote switching up to 3 antennas. Not a rotating er stepping switch. Simplify installation, save money by running ono cable instead of several to your antenna array, With type N, 8NC. (TTir QC TNC or C connectors See your dealer for catalog sheet and cam* ptete sp cifications, or write DOW KEY CO., Thief River Falls, Minn.

Complete With Builtin Power

SUPPLY, TUBES AND CRYSTAL 299.95* The MODEL 2-150 converts the 20 meter output of your SSB, AM or CW exciter to 2 meters. Resistive pi-pad permits operation with any 10 to 100 watt output exciter, either VFO or crystal controlled. Power input to 7854 final 175 watts PEP on SSB, 165 watts CW, 90 watts linear AM. Meter reads PA grid, PA plate, Relative output, 50 70 ohm input and output. Quiet forced air cooling. Modernistic, recessed panel grey cabinet, 9 x x 10 .

Meter Converter With Nuvistor Preamp

Unbeatable performance at ati unbearable price. Only 10.DO ppd. Completf with 6U8A* GCWJ tuhei and cholcc of 36 toe. crjital for 14-18 mc. output or 49.4 mc. crysut for broadtail hand output. Fuiiy assembled, tested and fuurameed. SinsiLivitT .1 mirrorolt Ntilte fijrtire 2,5 db VANGUARD E LECTRONIICS LABS Dept. H-4 190-48 99th Ave. Mollis 23 N. Y. 200C Hewlett Packard Audio Oscil- I 410A Hewlett Packard 410A VTVM, I with Probes 70.00 ea. I 314 Ballantine 5 Mc VTVM .01- I 1000 Volts, with Probes...

North American Importer Of The Famous J Beam

WE HAVE EXPANDED OUR FACILITIES AND NOW OFFER ANTENNAS Telrex - Mosley Andrews and Communications Products to supplement our Famous J Beams, Rohn - Triex - EZ Way - We wiN install to 150 miles from Chicago. Parks and Ameco Converters - Comaire re entrant filters and tuners. Whether you want PL259 or S0239 Co-ax connectors at < 45 each 3 for 1.25 or a 27 DB, 432 MC antenna on a 300 ft. tower, we can furnish it. Extremely fine prices on combination deals. NOW One stop shopping. orn'W 5nd imSiw...

Dww

1 1 li1 ulflvrlinl Iii tiraaiicafi oewf, utmi Icntm. - iJ .m- -ii Jicj- iitTii i> f trrni'rtMHimtiii ptimdatll In I ft*' M L.I hr-Llmv nn* fmiml Aiipm I ., ima, rt- + rn - - < ---mi -pr C W E* ihi *UU F '-'iiia-irl ill) iheili i 3t tflUt*_______ _____ citj or 11 il* Lut i 111 1 ih bcnbf iniikh'it hi 'hfl Nu rtluj al rannien for ji pr-rl hile uf tuo np i-'i mjhjpct Co Cta - -- LncLi -m tmJ comJlLliifhi hmilFinfUi fl< an> d *nii reiucibln Fvr rnv.p- hr him Ihm l.trviud1 tu fir fn-rrcihi.-...

Eliminate Tvi Fast

For use with RG8U Etc 52 ohm 75DB Attenuation or more above 54mc Insertion loss less than .25DB 4 section filter, END Sections M Derived will handle up to ONE Gallon of R.F. Terminates in two S0239 connectors in & out. Get em at a LOW PRICE ONE TME OFFER Full Description Back of ARRL HANDBOOK

Fcc

Your key to future success in electronics is a First-Clas3 FCC License. It will permit you to operate and maintain transmitting equipment used in aviation, broadcasting, marine, microwave, mobile communications, or CitizensBand, Cleveland Institute home study is the ideal way to got your FCC- License. Here's why Our training programs will quickly prepare you for a First-Class Commercial Radio Telephone I cense with a Radar Endorsement. Should you fail to pass the FCC examination after...

Special Special Special

Rodio Handbook, 15th Edition, written by Bill Orr W65A1, over 800 pages. Covers every phase of amateur radio from the very basics right up through the construction of just about everything you could want in ham gear. Originally published at 8.50. Superceded by the new 16th edi 1 ion which is the same except for new construction projects and selling for 9.50 (see number 11). Special, until the last few copies are gone, only 5-95 100 ELECTRONIC CONSTRUCTION HANDBOOK by W8MQU. Covers all sorts of...

Bell Electronics

Used Good F M Gear for HAMS Bendix Dumont GE Motorola RCA 6 or 12 volt t 17 volt Write for listing Weatherproof coaxiaJ relay for remote switching of r.1. sources. Designed for mounting on mast and remote switching up to 3 antennas. Not a rotating er stepping switch. Simplify installation, save money by running ono cable instead of several to your antenna array,

Available Through Your Dealer Or Write For Further Information

60S UNJVERSJTY AVENUE LOS GATOS, CALtFORNJA is depressed the power supply should start operating immediately and a high pitch hum should be heard. Make a voltage check with a VTVM or VOM at the output of the power supply (600V, 300V and -120V). The voltages should also check on the front panel meter. Adjust the slug of coil LI for maximum grid bias on the 5763. The slug of coil L2 is then adjusted also for maximum bias on the 61 16 and the drive control is advanced slowly until the grid current...

Roberts Enterprises

RR Brenwood Est., Noperville, Illinois 24vdc Supply Transformer, 13 7 60 1 pri. 31, 32, 35 & 36.7 vac sec. frii . amps new, thermador 8,50 delivered 24 vac, 10 amps, Transformer, 115 60 1 pri. 7,25 delivered 5CR-522 McdufaMon Transformer, new, T C S Modulation Transformer, r.,000i c.t. UfiOOz, Broadband Conical Antenna for 300-3300nic. Tvpe -V i.nnector AT49A A PR 4 new 5,50 delivered 5 4 X 13 X 15 OVER TERM. 60 LS5+ SHIPPING WT( USED, TESTED & GUARANTEED 38.50 F.O.B.LA,

Figure I

Screen of the 614fi also to obtain better quality of audio. The plate of the output stage is coupled to the PI network. Phis type of output network is used to provide 1 ictter efficiency and eliminate TVI problems. The front panel meter serves a twofold purpose it is used first as an ammeter to measure the plate and grid current of the 6146 and, second, as a voltmeter to measure the output of the power supply (600V., 300V, and 120V). The shunt and multiplier values were chosen so that, when all...

Laboratories

Division of 6> cjuircS-SiimlerH, inc. 222 RT. 53, Ml. TABOR. N. J. TELEPHONE 627-6800 Author's home and control station I to r I Automatic Combination and Periodic Information Unit 2) 220rnc transmitter 3) Six meter transmitting antenna the one important thing that cannot be designed into it is reliability. This was the reason for the Baldwin Hills location, all of 400 tremendous feet above sea level. As a repeater location it was worthless but as a service location it w as excellent* being...

Qky

Having trouble working 6-meter mobiles whoVe using whips, with your home-station beam Or maybe youre interested in an omnidirectional antenna for CD net use which you can put up or take down in a heck of a hurry Or maybe you just want a simple and inexpensive skywire for Six, which you can put together in a very lew minutes and which will perform excellently (although admittedly, it's not in the same league with a 4-element or bigger beam). If any of these situations fit you, you might consider...

We Can Help

Box 220-GC BEVERLY HILLS, CALIF. 902T3 Phonesr Area 2t3P office 272-5707r messages 275-5342. In the interests of making home construction simpler for those readers with anemic junk boxes 73 has gathered together the parts required for building our less complicated projects. These kits are as complete as we can make them, containing good quality parts, Except where the chassis or case is integral to a unit we do not supply it. We will mention when we do supply a case or chassis. We do supply...

Wwgf

Oklahoma City, Okla. One of the most popular final-amplifier tank circuits around these days, at all power levels, is the vipi-net in the nearly 30 years since it was first introduced to hamdom, it has put almost all other circuits out of the running. One of the main reasons for this is its reputed ability to match anything ' and within limits it fulfills this promise to an amazing degree. But from time to time one turns naughty, and refuses to behave as...

Elk

SHORT WAVE CONVERTER FOR HAM BAND RECEIVERS. One tube short wave converter so you con tune SW broadcast stations, Power supply included. See Aug, 62 p 36. W2LLZ 513.00 RECEIVER-DECEIVER. Substitute oca oscillator for your receiver for sideband reception, complete with power supply, tubes, voltage regulator, etc. See jan 64 pg 30 W2RWJ 19.95 TWO METER PREAMPLIFIER. Uses two 6CW4 riuvistors in a grounded grid input circuit (March '63 pS) and one 6CW4 nuvistor grounded grid output, Complete with...

O Box A

Ever, as I think that all of us. at least the majority who are dyed-in-the-wool hams, arc mainly interested in preserving and fostering the grand and glorious hobby of bam radio. In present administrative hands yes, I mean ARKL), it is becoming less and less of a hobby and more and more of a '4political issue there is your chance to bring it back where il belongs, thru loAR. Sure, 1 know, is does every ham wiili a few year* background, that commercial and military interests, con* tinning their...

Smc Mc

4CMC to 65MC Third or Fifth Overtone 4,50 ea. 65MC to 100MC Fifth Overtone 6,00 ea. DRAKE 2-B Receiver Crystals 4.00 For Motorola, GE, Gorisct, Bendrx, etc. Add 2.00 per crystai to above prices SUB-MINIATURE PRICES slightly higher CITIZEN BAND Class Crystals _. 2.9S Over oG.OOO CB crystals in > lock for all sets and channels, both HCti U and miniature types. To injure proper correlation and correct frei . operation, order by manufacturer model number and channel. ALL TEXAS CRYSTALS are made...

Jefftronics

4791 Memphis Ave, Cleveland, Ohio 44109 wave element to maintain spacing and to support the element. Now prepare your balun as shown in Fig. 2y and solder each center conductor (the 20S ohm connection points) to a radiator-hose clamp of proper size to slip over the antenna elements. Slip the clamps over the elements (this may require partial disassembly of the antenna or may not, depending on your clamps. If vou use the universal variety, no dis- assembly should be necessary) and tighten them...

Meter Beam

One Inch Elements for Low Q and Wider Frequency Range 1 2 Foot Boom for Wide Spacing Dipole Driven Element, 52 Ohm Feed Forward DB Gain 9.2 Front-To-Back 28 DB All Tempered Aluminum Driven Element Assembled. Shpg. wt. 20 lbs. Gamma Match for 52 Ohm Feed Resonate Frequency 50.4 Meg. Forward Gain 11.2 DB Front-To-Back Ratio 25 DB Boom Length 15 Ft., 11 4 Inch Dia. 1 Dia. Elements for Low Q, Wide Range Tempered Preassembled Aluminum Efements, Easy installation. Shpg. wt. 20 lbs.

Please Prnt

This means that whenever you write to an advertiser and mention that his ad in 73 brought you to him that we will be able to run just that many more pa es in fixture issues of 73, Though advertiser after advertiser tells me that 7 3 is the best pulling magazine of all for direct sales and for the sale of new equipment, we seem to lose out every now and then on catalog distribution. Fellows, how can you get along without some of the basic catalogs I have several that I keep right at hand all the...

And Books

Now in its fifth month with back issues getting rarer and rarer* This VHF monthly magazine is edited by Jim Kyle K5JKX and presents up to the minute reports on activities on all VHF and UHF bands, technical articles of interest to VHF'ers, and other general information not to be found elsewhere. This is the only strictly VHF magazine being published now. If you are a VHF'er you won't want to miss a single issue of 6up . . . you should support it. Subscriptions are only 2 per year,...

April

Thermal stability poor More ventilation visually Kelps. You can add a small light bulb near the oscillator to keep tilings warm while the receiver is turned oil. (The bulb should be off when the receiver is on.) Add a product detector for SSD, Vernier mechanisms ire readily available which can be easly attached to the tuning shaft for finer tuning. Make a new hand spread dial scale for 15 meters. Add a Q multiplier or even a mechanical filter for the desired selectivity. How about an S-meter or...

Asrury Park New Jersey

The right-hand part of the circuit is the cathode-follower regulator of Fig. 6. If as in our previous examples we use hali a 12AU7 here, let's see what happens with various loads and input voltages. With no oad at all taken from the supply, the grid bias from grid to cathode will be about 3 volts. Since grid voltage is clamped by the NE-2II at 100, this means Cathode voltage will be about 103. With 5 ma being taken by the load, a plate-to-cathode voltage of 50 and a grid bias of 0 volts will...

C

New 6 and 2 meter portable beams* For 'Mountain Goats' that like BIG SIGNALS from little rigs. Model KXIHT 6 Tiieicr 3 rL-ments Net 13.95 Nfoclct II riM 2 intter S elements (wide The International Telecommunication Union (ITU) is an international organization established for the purpose of coordinating international telecommunications of all kinds. It operates principally through conferences, meetings, an Administrative Council and a secretariat and by correspondence. Its seat is located in...

Catalog

Bandpass 6 db 3 kc (approximate) ACF-2 Two-crystal filter circuit using low impedance link input and 2K resistive output load. Unwanted sideband rejection greater than 30 db+ 9.95 ACF-4 Four-crystal filter circuit using nominal 600 ohm input and output. Unwanted sideband rejection greater than 40 db. 18.95 ACF-6 Six-crystal filter circuit using nominal 600 ohm input and output. Unwanted sideband rejection greater than 55 db, 27.95 MATCHING OSCILLATOR CRYSTALS for the ACF filter series....

Choice

9 pin. mica filled, tan 7 for SI .00 9 Pin tub- Straighten* . BRAND NEW. by STAR. Alt metal, 35c each, 3 for SI.00 nniF< Save your loot I'll have n load of GOODIES Tipton Ind CB EYE BALL QSO on April 1Z De Kalb, III SWAPFEST on Apr. 26 411 orders exrenl in emergency or I'm fit a hamfeHt, shipped fame ir ved. For free GOODIE sheet, sender tf-Jreaeed sta mped envelope PLEASE, PLEAf tncUide sufficient for poattie A insurance. Any orcesa returned With order. Telephone CAIumet 5-2235 2333 S,...

Coaxial Relays

4 Standard Models, AC or DC UHF, N, BNC, TNC or C Conn. Sin i41JU.I V L*l* th n 9 H, Outstanding favorite for amateurs , , . Versatile combinations for industrials Low VSWR less than 1 15 1 from 0 to 500 mc LOW LOSSES , . . High Contact Pressures LOW CKOSS-TALK through use of patented isolated connector arrangement. HIGH POWER RATING. All coils encapsulcd in epoxy resin for quieter operation and resistance to moisture. UNCONDITIONAL GUARANTEE for one year. (We will repair If faulty within...

Companion For Your Sw

EXTERNAL VFO PROVIDES FOR SEPARATE Complete coverage of 20,40,75, and 80 meters. 100 kc Calibrator, * 15 mc Reception of WWV+ VOX. Voice Controlled Operation including Anti-trip. Built-in Speaker. Phone Jack. Plugs into ALL SW-240 Transceivers, (installation Kit included,) Operates directly from Transceiver supply., No additional power supply is required. Those who now own an SW-240 and AC supply ineed to buy only the Swan-TCU. The new SW-1178 AC supply may be installed inside the TCU cabinet...

Converters And Filters

A DFDT unit internally connected in the de-enerfltzeri position, ideal for switching in and out a power amplifier between an enciter and an antenna, DK2-60B with UHF Connectors 19.00 D K 2- 60B-2C with UHF Cur -neetor and OPOT auxih* ary contact S2095 (BNC, TNC. N and C slightly higher) game for knowledgeable experts. One finally grasps the fact that there are a great many groups interested in spectrum. This is a simplified chart-lor instance under the various committees the interdepartment...

Cornelldubilier

Ih only Company that makr-s ihe-m all portion of the spectrum that has not one or more services looking at it or operating in it. Its rather obvious that we amateurs are mavericks all those outfits that really want to liolcl onto what they have are where the action is. Further, it would seem to me, that Amateur radio, with its world wide implications and its importance as one of the tools of peace and good will, would have its headquarters in the place the world knows is our Capitol. OK so we...

Day Trial

Return Por Full Rt urid If You Burn It Out Or Art' Not FULLY PLEASED ton ccupiri + Munita.ed (unir lo fwdimr) iwittJiinr No XVI or * Full Legal 3ti Oft Min. Guin * Burnout Improved I0ZA AdjtuUbl* Mnte Ctrctal iO-80 mtrs) Prooi Breaks Any Xrnlr-Rcvr Belween DqU & * Nd Etfed on * i WSidrlom* Hashes Without Cliclts Improved Stmt- Trinimii ioO (optional) conductor Through-VuiiLian Svittli Write far Free Lit raturt Swilth* Retr DirectU to Anlenru 33 IVWrtJe Atemw for Unity Ciin 6-80 Mir*. FIGHTER...

Direct To The Factory

605 UNIVERSITY AYENUE LOS GATOS, CALIFORNIA In push-to-talk operation, the Mike Gain control is adjusted for an S-meter swing equal to one half of Hie maximum S-meter tuneup value, ''his adjustment is not critical because of AALC action. Several notable points were observed in operating the transceiver, he tuning control is very smooth and precise with a good weighted feeling. The receiver sensitivity of 1 microvolt for a 20 db signal-to-noise ratio produces a very low background level with...

Division Of

Pete Crystal WA60HD 691 Serenade Way San Jose 11, Calif. With the mounting interest of MCW on the VHF bands, my Dad, WA6CNL, has built the mou-key, The mon-key is an audio oscillator for monitoring, an audio source for the modulator and a relay for keying the transmitter. One of the problems of MCW is having a microphone right in front of a CPO which is always a temptation for the operator to talk into- It s also distracting for the receiving end to hear coughs, chairs dragging, or dogs i...

Electronics

J it circuit was assembled on i small piece of Vector-hoard, with the tuning capacitor and batteries mounted in a 5 X 7 X 3 aluminum chassis, An aluminum bracket was bent to hold the sweep' pot and mounted behind the tuning capacitor, spaced to accomodate the mechanical shaft coupling. The Vectoi board was also mounted on the bracket. The oscillator circuit is simple, using a 1 mil rfc for the tank inductor. The range of the circuit as shown is about -100 kc to 500 kc, at...

Epsilon Records

T I IR A C FJi C FCC IFRR Wells Chap n W2DUD 1 18 Woodmancy Lane Fayetteville, N. Y. We are avid risers of one of the worlds most important resources, spectrum allocation, I here is just so much of this resource so until someone invents negative frequency we will just have to resign ourselves to using techniques to conserve it, In addition we must use it wisely and fight for it desperately. This limited spectrum is the direct cause of the extreme pressures of diverse groups to obtain space for...

Figure

Now we can talk about controlling power to a load. There are seven possibilities with respect to ON periods assuming that steps 1 and 5 are OFF periods. The seven possibilities are ) Steps 2 and 3 ) Steps 3 and 4 Below is discussed each of the seven possibilities in order of simplicity. Although some of the possibilities may not seem important to most of ns, they merit mention at least to mention the ersatility of such circuits and to furnish more food for thought to the homebrewers and...

Fm Transmitter

Frequency 152-165 mc FM (Easily converted to AM ) P.F, 6146 output driven by 2E26> 5763 multiplier Easily converted to 2 meters. Will run up to 90 watts. Final and multiplier lines silverplated for high efficiency Requires power supply and will run FM as it stands or AM with additional modulation can be taken off many low frequency transmitters. 52 ohm output, Complete with all 9 tubes and diagram, less crystals and power supply. 9 H x 9 W x 16 D. xtal controlled channels & guard channel....

High Voltage O

FIGURE 1 Circuit diagram of the f spotter FIGURE 1 Circuit diagram of the f spotter .0 Ceramic capacitor 50 pf Mica capacitor 10 pf Ceramic 68 K Vi watt carbon resistor 22 K ' 2 watt carbon resistor Milliammeter in range of 3 to 10 ma Slide action Double Pole-Single Throw switch (SI) 2 Banana plugs ixl and x2) 12AT7 tube Minibox (size depends on type of meter used)

1

The line in order to minimize loading effects which would lower the Q of the plate circuit. The amplifier is built into a brass or copper trough, the dimensions of which are given (Fig. The easiest way is to cut the brass plate, drill it and then bend it as shown. The cathode input capacitor is made of tabs, one of which is directly connected to the cathode pins of the tube socket through a cathode strap which is soldered to one tab at right angles (see Fig. I and picture), At the point where...

Inc

The tone from the speaker will not sound real crisp due to the absence of harmonics, Although the audio doesn't sound too crisp through the speaker, it will sound real clear on the air. After everything is wired in, adjust R5 and R6 for the proper tone and audio level. Then with the mon-key connected to the modulator, adjust RS until you get 100 or near 100 per cent modulation. Do not adjust R6 after you adjust RS or you will have to readjust RS all over again. We have had great success...

Hne

The tube off and satisfy the zero-load-current condition. With tO ma being drawn, the output voltage will be only 101. Again, with 100 volts between plate and cathode, a grid bias of 1 volt allows 10 ma to flow, and with the grid held at 00 volts the cathode must be one volt more positive to satisfy the requirements. So at 10 ma load, varying input voltage from 150 to 200 causes a change of only 3 volts in output. This is a vast improvement over the 34-volt change of the Fig, 6 circuit, so that...

L

THE BARKER & WILLIAMSON MODEL 6100 TRANSMITTER IS SO FAR AHEAD OF OUR TIME IN DESIGN, PRINCIPLES AND ENGINEERING, THAT WE CAN OFFER A GUARANTEED LIST OF FEATURES . . . Barker & Williamson Guarantees that HQ other Amateur Transmitter on the Market today offers ALL these features Crystal controlled synthesizer, frequency continuously variable No free-running oscillators Direct frequency read-out (no interpolation) * Frequency resetability approaches a frequency meter Crystal stability on...

Mc Dual Conversion

Selectivity 6 db 17 KC Sensitivity 1 micro volt or less for 12 db s n ratio. Fre. Stab dr 0015 from 30' to I.F. Frequencies 9.5 Mc & 455 KC, 6AKS RA Amplifier 6AK5 High Freq, Mixer 6BA6 High IF Amplifier 6AU6 Low Freq. Oscillator 6AU6 Low Frequency Mixer 6AU6 1st Low IF Amplifier 6AU8 2nd Low IF Amplifier 6AU6 First Li miter 6AIJ6 Second Limiter 6AL5 Discriminator Diode 12AX7 Squelch & Audio Ampi. 12AT7 Noise & Audio Ampi, 6V6GT Audio Output Ampi. 12AT7 High Freq. Oscillator Complete...

Midwest Electronic Supply

50 - 144 - 220 CONVERTERS & PREAMPS I.F.s at 7, 1IJ, 14, 20, 22, 24, 26, 17, 28. 30,5 A SO Mc< All with built-in power supply. 6 Meter (6CW4-& UB) 134.50 ppti, 2 meter (4-0CW4) 54.1*5 jipJ. Best appearance and workmanship of ariy VRF converters. Wcak-slfnal performance equal to or better than any other nuristor or 417A manufactured converters Best value by far. Write for descriptive literature, Parks Electronics Rt. 2, Bok 35 Bfcatferton, Ore.

Number Street

SB-33, SBMA , diminutive duo four-band (80-40-20-15) SSB transceiver exciter and high power linear amplifier. Bright, state-of-the-art version of a full thumping kilowatt entirely self contained, including all power supplies in two tiny cabinets The only ''extras'* needed are microphone .,. antenna two lineal feet of mounting space .,. and a strong desire for a clean-cot big signal. And when you look at the photograph above, (the 664 dynamic does look big in comparison to the linear amplifier...

October

See your local B& W Distributor or write for colorful brochure. This new transistorized alternator regulator is suited to all types of mobile use. Seatronic regulators have no points to carbonize no filtering required no effect on other electronic instruments constant voltage output reduces maintenance and calibration considerably. The Seatronic solid state regulator has positive voltage regulation of 0.2 volts at any speed. Gives maximum output at idling speed. Nominal voltage 14.2 volts...

Orld Radio Laboratories

341 5 West Broadway Council Bluffs, Iowa Zip Code 51504 ehmmates leap frogginghybrid circuttry-transis-torized AVCfAUDlQ VOX dual vernier tuning handsome styling modern 4-co lor brushed aluminum paneL Perforated steel cabinet, hinged top meter & VFO beautifully illuminated, plus many other features. WORLD RADIO LABORATORIES 3415 WEST BROADWAY _ COUNCIL BLUFFS, IOWA PI Enter order on attached sheet. Send Galaxy III brochure. C Send trial terms, Quote trade allowance on attached sheet. In...

Package Hi

National SSB Station NCX-3 transceiver NCX-A ac supply and speaker NCX-D 12v dc and mounting rack Prices are cash* All subject to price LOOKING FOR NEW GEAR We feature all the really good ones. For instance CLEGG, COLLINS, DRAKE, HALLICRAFTERS, HAMMARLUND, HYGAIN, NATIONAL, SBE and SWAN. TRADES and TIME PAYMENTS SURE BOTH I ASK for brochures, prices quotes on any of them. Also request our latest bulletin of top quality, fully reconditioned and guaranteed used gear* eager UHF experimenters than...

Pr

Including cascaded basic regulators, the ultimate of zero source resistance can be obtained or source resistance can even be made negative, so that the output voltage of the supply rises with increasing current- This, however, is usually undesirable. Before getting into such complex arrangements, though, lets examine a couple of elementary active regulators which do not include basic regulators in their designs. Neither of these will reach the low source resistances of a basic regulator, but...

Price

No Books To Re*tf Nfi Visual Gimmicks To Distract You. Just listen anil learn tinted on modern pftythoEoileal techniques Thii course will lake you beyond IS w.ihm. in LESS THAN Jfi THE TIME Available also on magnetic tape Se* Your Dealer Now Album Contains Three 12 LP1 IVt Hr Instruction Now, learn code and something else at the same time. Fascinating story and code practice at same time, 2.49

Products

Function, the overall system readily can be made to have a minimum reliable detectable signal sensitivity, in l he presence of the inevitable noise caused bv electron motion in all high gain electronic systems, heretofore unobtainable. his Flying Noise-Lock system is unique in that the overall shape of signal plus noise is not used as a prime function, nor is stable phase relationship between that of a standard and the wanted energy necessary for successful operation, A prime function of this...

Redline

* MAST FEEDS THRU ROTATOR FOR SAFER AND EASIER INSTALLATION MAINTENANCE * rotation torque + self locking 8y 5tuho gears * ZIMUTM inciiCATiOh 0T SELSYNS * malleable cast masking clamp slppu o * will fit into ofl onto a 6' sj eo tower WHITE FOR FUEF PL - n ICRiBiitGTHf WQRLD'J MOST

S

The reficx circuit responds to both audio and radio frequencies, and to convert to signal tracing all you need do is remove the antenna loopstick and substitute for its secondary an r.fj choke with sufficient inductance to be effective at the intermediate frequency of your receiver. Connect a shielded probe in series with a blocking capacitor to the transistor base end of the r.f. choke. These receivers have surprising gain and in measuring at substantia levels, tracing audio, or to avoid...

Sonobuoy Transmitter

Dropped from airplane by parachute into water, picks up sound by hydrophone. Transmits MCW at fixed freq. 70-90 Mc. Battery operated. Complete w parachute, hydrophone, S tubes, 40 whip antenna. Less batteries. iVew , 7,95 300v DC POWER SUPPLY 1V ELECTRONICALLY REGULATED Standard 19 panel rack, Uses 2 6B4G, 2 5X746, 2 6SL7, 2 VR150 tubes. Hxtra 6.3v AC (ft 3 . 19 12 or 24v DC 2 AMP GERMANIUM RECTIFIER POWER

South Th Street

Usable range with the receiver, If the tank being checked happens to be the final, the meter on the probe will indicate when the antenna is brought into resonance. This little tester was built to do just one thing sort out some old ifs in the junk box. After we tried it we found that it would do a lot of useful chores around the ham shack, With proper care and feeding, it can probably learn to do tricks that we haven't even thought of.

Strength Meter Stod Part

UIHLCTION FINDING PREAMPLIFIER & LOOP gives inn bearing, no 180-degree ami> i gully, when used ahead of any rt vr 200*1800 kr In 3 bands, niul we tell how 29,95 10 mild i l'y 3d band to MARINE fren. New FM XMTR-nevfi bise station. Farnsworth AN FHC A. puta ou W into antenna, 30-40 mc. Voice, 120 v CO Cf) cy r wr sply. spealtor, meter , etc. in rack iiHbfnet LM FREQUENCY METERS J25 kc u mc, with Cal. hk< plue, xtl. Instruit. ur eous . . . .

The Dayton Amateur Radio Association

Exhibits Technical Sessions Forums-DX, VHF, SSB, Awards FCC Exams Women's Activities DAYTON HAM VENT ION P.O. BOX 426 DAYTON, OHIO 45401 for attractive brochure, map, and list of accomodations. Ry 1 For Step 2 ft J OM Ry I For Sti p 3 6 4 ON Ry 2 For Step 2 & 3 ON Ry I For Step 3 & 4 ON

Tons Of Amateur Equipment In Stock

SAN DIEGO 1413 India Street BE 9-0361 MQN - FRJ 8 30 to 8 00 SAT 8 30 to 5 00 so tight that they cannot be moved. Using strap braid or salvage shielding from a short chunk of coax, connect the common ground point of the balun assembly to the center of the aluminum bracket holding the quarter-wave element on. This provides an electrical ground at this point. Now hoist the antenna to an approximately vertical position and feed in some rf. If you have a source of about 5 watts or less you can make...

Tronic

BX, N.Y., 10456 TELEPHONE CY 9-0300 RIPPLE FILTER KIT Smooth out your 6 or 12 volt supply for transistor work 1 32 Mh Choke 1 25,000 Mfd. Cap. with mount. Only 3-95 STUD MOUNTED DIODE RECTIFIER 2 Amps 200 p,i,vT 2 with reversed polarity 4 for 2.00 100 Mfd. 450 volts Paper Electrolytic 100 Assorted Disc, Capacitors Good Assortment) 100 for .90c

Tt Lecow

Plannr fX n t PorUl PLlt, tnif a r ein*nt tntrrfiatlnnal Avilaum tnti'mat frFq PFgist. itiL4rnal Tiltrutnm U ' h rili Am riran ttc irrnnl InL 1 i-i S titL> LL J SperLII rLnn ic ji( nt& FinMi(L SrrtU'O CphF Tnm* mrl Can Lit) f.'tin TOfrUnriuL ft F< & el n lutt . RH AtK'L . Al iirf MiU.jiii CCFC. F COSCC A, (CAI> , fr*, J co, rrt NAP BA.

University Model Mm Speaker

Completely waterproofed (actually submergence-proof) speaker. 6 dia,, 16 ohm voice coil, 15 watts, Double-re-entrant type with a built-in, hermetically seated, permanent-magnet, dynamic driver unit. Freq, response 300-6000 cps. Wonderful for boats or any outdoor use. Regular price is 43.50. TS-153 AP FIELD STRENGTH METER. Designed to indicate the relative field strength & freqs of the radiation of transmitters operating within the range of 62 to 72.5 Mcs. May also be used to indicate...

Wfup

For proper operation, many electronic circuits require excellent regulation of their supply voltages, Oscillalorsf linear amplifiers, and may other dev ices must have regulated voltages for best results. And as a result, there's a lot of talk about voltage regulation. But what is it, and how can it be done ut these questions to any number of Iiams picked at random, and the replies will undoubtedly amaze you. Let's find out a little more about this regulation bit, so that if anyone asks us those...

New

For SB-33 (only) Quiet, entirely solid-state. Export sales Raytheon Company, international Sales & Services, Lexington 73, The author and the repeater, Panels, top to bottom ) Preselective LC tuned filter 2) Six meter receiver 3) Audio panel 4) Tape deck 5t Modulator 6) 220 mc control receiver 7 1 Control panel 8 Six meter Transmitter In December of 1959, within the confining walls ol Los Angeles City College* a momentous decision was reached, a decision that was destined to shake the very...

Semiconductor Sale

G Upright 2*n*r Diodes, asst volts S 2 IN429 Zener Relftrentes, 6 volts S I 3N35 Tetrode 150 MC npn. TO 18 I 2N7D5 300 MC, 3041 MW, siL nprt I 2N718 npn sif> Planar, (00 mc 6 Tej as 750 mil 400v Rectifiers 10 PNP Switching Transistors to KPN Switching Transistors 5 Phiko (00 MC Madt Transistors I 20W Si I icon M usa, npn, 2 NI 64B 15 Germanium Diailfis, J M34 equals A Precision nur R f renc s, nxinl 3 Zener 6 volt diodes, l watt 2 One Watt 2N34I npn, Sil., TOB I 85W Drift Mesa 2N 2I2 npn I...

Manchester N H

Trouble has been corrected. (6) Combination Comparison Unit This unit maintains a constant 24 hour comparison of Internal and External Memories. When they contain different information, this unit clears External Memory and does nothing else, However, w hen they contain the same information, the repeater is turned on if it has been off or off if it has been on. Then this unit activates the Random combination Generator so that it will generate another combination, and it clears External Memory, A...

Quz

If you want to pre-register drop a note to Dayton Hamvention, Box 426, Dayton 1, Ohio. rhe ninth issue of 6-up is going to press now. The big feature in this issue is a construction article by Bill Ashby on his Flying Noise Lock unit which is described in theory in this issue of 73. Bill wanted us to run the circuit in 6-up exclusively in order to bludgeon more fellow's into subscribing to 6-up. Laudable. I hated to see such an important breakthrough get only six thousand circulation when it...

Wemf

This sweep generator solves most of your if and crystal frequency problems. Operates on center frequency 455 kc. Compfete kit W2EMF- 1 95 BASE STATION ONLY 399s NET CUBICAL QUAD Tailor mad to increase ranrce in limited CB band. Toutch, lightweight components permit use with most TV-type rotors. Easily assembled on ground or tower. SPECS Forward Gain 8 db Front to Back, up to 40 db Feed Type, 52 ohm coax Polarization, horizontal or vertical Longest Element, Boom Length. 65 1 2. AIR SENTRY...

References

ARRL, The Radio Amateur's Handbook, i962 edition, pp. 228-236, Anon., Zener Diode Handbook, International Rectifier Corporation, published I960, Anon,, Regulated Power Supply ' Radio-Electronics, April, 1959, 125. Bramham, Kenneth* Voltage Regulation for Transistors Electronics World, July, I960, page 62. Ch ipnian, L. IX, W IPRM, ' Combination Regulated Power Supply ' QSTt October, 1957. page 16. Cliristmau, C. J., WASAFF, Power-Supply Control and Regulation by Means of Thyratrons ' QST,...

O V

Voltages could lead to a better noise figure. The amplifier is very stable, since the S058 with the grid connection coming out on the entire socket, lends itself to grounded grid circuits. Before working properly, the tube must warm up for at 3east ten minutes. This time is needed for the transeonductance to go up. Connect the amplifier to the converter and and to the antenna and tune the plate condenser. At one point you should notice a small but definite increase in noise the amplifier is now...

WDUD

Bill Ashby K2TKX lias been working hard at digging down deeper and deeper into the noise after weak signals. His article on synchronous Jetection in the September 1962 issue of 73 started a lot of fellows thinking about the subject. Now Bill has come up with a breakthrough in the field which permits the best laboratory receivers to dig down another 30 db and come up with copy. Below is an extract of the information contained in the patent application, which should give you a good idea of the...

Ilov

A Output coupling capacitor tab C3, copper sheeting V f x and soldered in center to output coupling connector, h Plate line ceramic Stand-off insulator, V dia,. high, c Plate tuning capacitor C4 two required copper sheet 7 amp ft dia. round. .1 Plate line. T4 copper tubing 2n long. Plate feed point is H from tube end of line, c Input coupling capacitor tab, H x solder to input connector. Part of Cl. Copper, ft Input coupling capacitor tabt ffi'x 1, Other part of Cl- Solder one end to cathode...

Supply

3832 West Lisbon Avenue MILWAUKEE 8, WISCONSIN WEst 3-3262 VISET OR PHONE do not write -our branch stores they nave no mail order facilities C H J CA GO 31T ILL. Milwaukee Ave. Ft Off icy 3-1030 ORLANDO. FLORIDA 19 Azalea Park Sh. Centrr Phone 227-8231 IMPORTANT Be sure to send aH maiJ orders and inquiries to MILWAUKEE STORE, Dept. 7 3832 WEST USB0N AVENUE, MILWAUKEE H, W1SC. i year 2 year O 3 yt-ars T. T P T and want to trurto What's your deal Nil mc gt v . t P gt gt amp J - . e a Add ress ....

Riy

Tubes String

Ohm near enough to zero for almost any purpose. A typical regulator of this type is shown in Fig, 11. This regulator delivers 300 volts at load currents from zero to 100 ma, from a 450-volt dc source, its source resistance is only 6.1 ohms. The only critical parts values in this circuit are the resistors in the string from the 6080 cathode to the OB2 anode, which are chosen to provide a 25-ma bleeder load for the swinging choke in trie 450-vblt source. All other values are typical for this type...

Mpudyns Labs I

Write for your copy of THE AMPLIDYNE VHF LINE Distributor inquiries invited Top view. Power transformer lower right, transistors on front panel. Modulation transformer upper left. The two 6X4 rectifiers have been replacd with silicons. Modulator transistors are mounted on rear apron, allow spotting to be carried out without putting a signal on the air. Plus 12 volts is brought in from the accessory terminal on the ignition switch to pin 4 of the power plug, from there, through the on off...

N J

Lafayette Radio Electronics Corporation. 1H Jericho Turnpike, Syosset, L. L, N. Y. announces a new self-powered Variable Frequency Oscillator for the 6 and 2 Meter Amateur Bands. Model HE-89. Price 29.95 A high quality variable Frequency oscillator designed to operate with modern transmitters using crystal ocsillators in the 8-9 MC region. High electrical stability is achieved by a seriesregulator tube protects unit from line voltage variations. Illuminated plexiglass dial is cali brated from...

Communication Antennas

What was wanted was a method that would meet the following requirements 1 omnidirectional antenna systems at both ends of the link, 2 no tones or modulation of any kind on the control carrier, 3 control information constantly changing in an observation-ally unpredictable manner, 4 no identification of control carrier, 5 absolute frequency secrecy, 6 no continuous carrier control identification would be necessary , 1 fulfilling all the above requirements would constitute an absolute, unbreakable...

The Technical Materiel Corporation

VIRGINIA GARLAND, TEXAS LA MESA, CALIFORNIA SAN LUIS OBISPO, CALIFORNIA LUZERN, SWITZERLAND . POMPANO BEACH, FLORIDA For complete detailed specifications, request TB 1014A. This is a complete general purpose f J amp transmitter providing SSB, ISB, AM, compatible AM, CW, FSK and FAX modes of operation. Accuracy and resetability is 1 part in I08 per day with tuning in 100 cps steps from 2-28 mcs. Conservative ratings provide reserve power for maintaining peak power...

Why Buy Saxton Wire

Notice that no other wire manufacturer cares one whit check through 73 for any other wire ads . All good parts distributors carry Saxton wire and they should be rewarded for this loyalty a good parts distributor is defined as one who carries Saxton wire . No wire manufacturer has a more complete line of twin-lead and open wire line. The price is indeed right. Sure, you buy some twinlead that is a little cheaper, but try and get rf through it. You would do exceptionally well if...