Appendix

Part 1 of Chapter I of Title 47 of the Code of Federal Regulations is amended by adding a new Subpart I, to read as follows Subpart I Procedures Implementing the National Environmental Policy Act of 1969. The provisions of this subpart implement the National Environmentai Policy Act of 1969, 42 U.S.C.A. 4321-4347, 1.1303 Scope. The provisions of this subpart apply to ail applications filed with the Commission involving the construction, abandonment, or razing of a structure. They also apply to...

And

A receiver capable of employing full age facilities under all modes of reception is essential for comfortable istening on (he amateur and shortwave bands. Many receivers however, employ only a simple age system that falls short of providing an acceptable performance, particularly when reception of CW and SSB signals is required. Although some excellent papers have heen written on the subject of improved age systems, most of them involve relatively complex circuitry and are designed to be...

Henry Ka

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

Hal Communications

Box 365L, Urbana IL 61801 217-359 7373 47 to 58,4 MHZr FM continuous tuning also 2 pre-set ehan. Voice power output 500 MW, 18 Tubes, power reqr 90 VDC 8Q MAr 6.3 160 MA (See accessories below) Size 5 x 13 x 8, Wt. H7 lbs. Price Used 3 Chan, audio freq amplifier for rmerphone & radio monitoring of various typei GRC flec.Tranv. 7 Tubes, oower req .135 VDC 36 MA & 6. 12, or 24 VDC. (See accessories belowj Size 4 14 x 13 x 7 3 4 Wt. 15.5 lbs. Price - Used SI4.95 24 Volt, used with RT 70 &...

Info

The cubical quad antenna has long been popular among hams because of its inexpensiveness, excellent performance and light weight. However it suffers from two major drawbacks it is cumbersome and not very rugged. The design described reduces these deficiences and even further reduces the quad's weight and perhaps expense, fhe mechanical structure of the cubical quad serves lo support two square forms of wire a short distance apart. The traditional method of construction (Fig. I) is not...

Rtty

Here is an example that originated with Don WA6PIR. Have any good examples that you want to see in these pages My husband is a ham and enjoys 73 very much. On occasion I will pick up one and read a few articles and enjoy them also. f ran across the Letters section of the December 1972 issue that E would like to comment on. After reading Mrs. Shera's letter about the October cover I decided in conduct a little experiment. I asked my husband his thoughts on the October and November 1972 covers....

Hh

- F gtiiT- a polled lOQ-c vjijp I 5 vc i. Mt 1 Aimoe e, ihort citciiit cH-OOf. triera fthgh rt 'it on ultra low t uple Figiir A. poiiMi Op Ampsupplv. 1 b y Iis, and 15 Volts of 0 5 Amperes. Mlg by Analog Devices, umiliar ( her mflOH1 002 tiftu'l prooi ulitj n.ijh i*r- F 2< ifr 6,5 Va i 1Amn po iffg.uta ert Uv Fa-rchtirf 305. tiwn circuit pmitcied Jg Sam ai BhOm. t (k.iT form 75 Maiing conn i-iar for ohou . . , SI .00 I S Von & Amp regu iien supply bv l lulyne (fipi ihowftj S29.Q0

Corporation

If mj, you probably already know th,iT having tone-burl capability an your rig is pretty important these davs II you've had a problem finding a quality, reliable tone-burst w'ltfraTcn rhe*nw> utti. UNIDYUE TBG 102 SOLID STATE TOP GftASE COMPONENTS EP0XY GLASS PCS. REQUIRES M0 BATTERY INTERNAL REGULATED P S FOR 1G 30V. FREQ. RANGE 1450-245D HZ, SPECIFY TWO FACTORY PRESET FREQUENCIES WHEN ORDERING, BURST LENGTH 100 MS. - 5 SEC. OR C0N7 TONE. FACTORY SET 1 2 SEC. HIGH AND LOW IMPEDANCE OUTPUTS...

Of The Month Entry Blank

Participating Dealer Amt of Purchase S_ (to be refunded) 73 Magazine is giving away, absolutely free, no strings attached, a rig each and every month - drawing on the 15th so send in this entry blank. Blanks like this should be available from your local participating dealer or from 73, in addition to the rig of the month, the amount of your purchase at your dealer (marked on the entry blank) will be refunded in full, up to a limit for any one month of 10,000, Enclose self-addressed stamped...

Pearcesimpsqn

* & separ tei V twii habla transiTiit ft * separately iw.lchable trinsnii ft receive channels 2 m i r transceiver 5200 Panama Avt,, RichmorMl CA USA 94804 THE ONLY QSL BUREAU to handl all of your QSLs to anywhere next door, the next State, the next county, The whole world. Juit bundle thern up please arrange alphabetically) and send them to us with payment of 54 each.

Rear

Front and rear view of the touch pad and its connections, If will he necessary to drill two small slots through the HT-220 front to accommodate I he eight miniature pins on the back of the pad. Remove and disconnect the HT-220 front cover and carefully focal, e the two pin areas free of the internal battery connecting strips. The pad may be conveniently attached lo the cover using contact cement. It may be advisable to hook up the pad first to determine if everything is operating okay,...

Factory Authorized Distributor

Motorola HEP - Circuit-Stick - Plessey All devices are first quality and are fully guaranteed. Professionally Engineered Antenna Systems Single transmission line TRI-BAND* ARRAY By the only test that means anything . . . on the air comparison . this array continues to outperform all competition . ., and has for two decades. Here's why . . , Telrex uses a unique trap design employing 20 HiQ 7500V ceramic condensers per antenna, Teirex uses 3 optimum-spaced, optimum-tuned reflectors to provide...

Gregor Y Electronics Corp

The FM Used Equipment People 243 Route 46. Sadd'e Brook, N. J. 07662 14 case (less accessories & ovens) 12 volts, 15 watts, transistor power supply 6 12 volts, 15 watts, vibrator power supply Accessories available for each of above units G.E. PROGRESS LINE STRIPS physically complete, but sold on an as-is basis only

Field Day Planning

The Foothill Amateur Radio Society (Mt View, Cat.) brought up a very interesting point for Field Day committees to ponder when they are making their plans for 1973. Ted Harris W8RPA 6 did some research on the average number of contacts scored by the five top clubs in each transmitter group over the last five years and put the info on a chart. The result is fascinating and seems to defy logic. At the very least there seems to be a lot to iearn from it. Plotted on the chart you can see that the...

Digital Special

Ten brand new (on carriers) dual-in-line JK flip Hops LU321 with data sheet and two pages of application notes describing hookups for -divide by three through ten, and twelve. Also self correcting ring counter hookups, etc. 7400,7401,7402,7404,7405, 7410, 7420,7430, 7440, 7450, 745 U 7453 _ 100 for 13.00____ea.S 20 744 BCD decoder driver 1 00 7473 dual JK flip-flop 55 7474 dual type I) FF 40 7475 quad latch 115 7476 dual J K FF 55 7483 4 bit full adder 115 7486 quad exclusive or gate . 65 7489...

Feather Fans

W1NTRONIX MODEL 850 INDUCED WAVE FORM ANALYZER. This unit, in conjunction with your present oscilloscope, permit you to view wave forms in the range from audio thru MHz without any direct connection. The probe n simply placed over ttte tube in question and the weve form, H displayed on th* oat illoacope. It may elSO be used ea a high gam amplifier to increase scope sensitivity, Excellent for T.V,r radio, amplifier, and transmitter repair and maintenance. Brand new,-with probe. SHIP WT _PRICE...

Time

Relationship between signal level and attack and decay characteristics of an age system, Fhese attack and decay times Lire illustrated in Fig, 2, When receiving an AM signal, the carrier is present to regulate the receiver gain and (he response time of the age system need only be fast enough to follow signal fading. An attack and decay time of about .15 second is typical for AM reception. Under C V and SSB conditions, no continuous carrier is present to regulate the receiver gain and if...

Editorials

The editorials in 73 pull no punches. Nothing wishy-wshy. It is safe to say that unless you read the editorials in 73 you cannot know what is really going on in our hobby. Did you enjoy the article in August on the DXpedition to Navassa This is one of the reasons that 73 is different it is involved. The editors get out there and operate, go on DX-peditions, organize them even organize ham tours set up repeaters - work in the contests work lots of DX are actually on slow scan - on RTTY - it...

End Amateur

Tion of environmentally significant factors. They provide for comment by interested individuals and organizations and by expert governmental agencies, and for their participation in Commission proceeding. They provide for the consideration of environmental factors at the same time and in the same way as other factors pertinent to a public interest determination are considered, except that they provide for the preparation of a detailed environmental statement following comment by interested...

SB

Excellent for HAM use ay unlruna switching, lntchinft* trun iniL. receive, i-tc,, and 1 Oil's of eomtnerciu.1 or in-duMtriid uses. Includes plajslic dusWrover with diagram und huokup info* 1 Ui> in plug-m bnBe. Co tit acta movable gold Hashed silver, sLalionjii) overlay, with nilv r cadmium oxide movable*. All Contact 10 amp 3TDT. Coil data. 1 15VAC 2250 ohnia, 17,5 ma. 12 VDC 21 mil,-Iflii ohms. Site x 1 Wt. i 01s. Center pin muisinfcr Comar Mfg. tj*pe equal loo 'TRANSISTOR' POTS 100 500 2...

High Power Epoxv Rectifiers

PtV SALE H 5000 2.25 - Mp n 2000* 1,00 n 6000 2,96 1 ftmr H 3000 1.35 1 S000 3.50 i 4000 1.65 I00 0 3,95 EPOXV SILICON RECTIFIERS mitrommi Terms .irlit i iajte, cod 'a 1 Rited net .ti> Phone Ortt-r- W ak fieW Ma . 7 i 2 RvtapE ifp-i D 1 Carmine W .ikc eld, iod Water Sirert S MAI HE PHONKD 15C CATALOG On Fiber Optics MCs1, Semi & Parts P.O.BOX 9 42 A , LVNNTI ELD, MASS 01040

Gain

O, Box 6 032 Ctemson University Clemson SC 29631 While trying to design a high current power supply regulator, 1 found that suitable transistors available to the experimenter are few. And these transistors arc not cheap two of the three selecte sokr for more than Current gain is definitely expensive in more ways than one, as this article exposes. But more important of those available, the betas given were either in a range or as a typical value. The disparity was just...

C C C Oc Ic C Ic Ic V C Bc Cg

Hi slew rat of amp . 2.50 Micro powvr 741 TO-5 2.50 Micro power 709 2,50 Precision 741 T0-5 . , + , . 2.SO 7pW pwr driver amp Precision 72J voltage rtg, Timer 2 uS conds to 1-hour 5 Times faster than 741C Dual 741 mini DIP* Phase loch loops (A j . . . . 3.25 Function generator < Mlni OiP) , . . 3-25 Four quandrant multiplier . . . . . 3.10 Hi-galn, DC amp. TO-5 , . ,44 RF IF, amp, 14 ckti, TO-5 , , . +69 Operational amp i A , r . , 39 Dual diff. comp (A Voltage recuUlor f A ) Frequency...

Check The Advantages Of A Vanguard Synthesizer Over Other Brands

No microphonics Can he used mobile over bumpy roads Reference frequency and spunous output down 70 dB. lendusing harmonics of output frequency which are used In the transmitter anyway.) All output Frequencies are generated directly from the VCG without the use of multipliers and are therefore fr* e of sub-hjrmonicv * Now available with output* In the 6r 8, 13 and 18 MHz. bands I corresponding to 144 MHi. dial feadfng) for direct substitution of transmitting crystals, More output frequencies...

Fm Inoue

. .yoii'0i e guing First Cabin . with the trend setia fm 2 meter FM A took at the tC 2Q for just S269.50 . Try to match these features with any other rig , , -, , T 12 channeh 10 itlals supplied individual tweak mg on all 12 T& R channels battery saving high or low power. 1 or 0 T T + n . - + . T -p ijg in, h< efded, moduaf consrructton hot rt vr , tess than A uW2Q db -buifl in final protection circun buill jn alternator whine filler -hefic,ili fld cavity rftsonstors noise cancel I r> g...

Check These Features

8-10 watts output (minimum), Speech clipping* Sensitive receiver .25 (max.) for 12 db Sinad. Selectivity Adjacent channel (40 KHz) down 50 db. Each crystaf does triple-duty, providing a transmit and receive frequency (Crystal Saver Frequency Control). Monolithic crystal filter-Compact, rugged attractive.

S

10 TO 100 MC plug-in ., . 24.50 TS1060 Teletype Distortion Test Set, Compact 3 Scope Indicator 1 10V 60 Cy Power 6 x 8 x 14 5 Level Punch Tape Reader. Range from 0-250 WPM depending on pulse rate to solenoid Crystal Kit for PRC6 Walkie Talk*e contains 42 crystal in a metal carrying case . S9.95 Compact hand held. Just hook up wire and use. With built in generator for ringing. No Batteries Needed SI 2.50 ea. GRC & PRC Equip, RT66 FM Transceiver 20 to 28 S27.50 Special PRC9 Back Pack Type...

Sstv M Ak

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

Low Loss Coaxial Cable

Blonder-Tongue has developed a new fine of coax cables for cable television networks, Twelve new types are available including RG-59, fSG-6 and RG 11. Their top-ofthe-line -4851 featues 12 gauge copper-clad aluminum center conductor and aluminum tape shielding with 50 aluminum braid. This particular cable has an attenuation factor of only 1.6 dB per 100 ft at 470 MHz The RG-59 and RG-11 types, while not perform ing quite as well as the 4851, offer improved loss characteristics over regular foam...

Agc Voltage

Calculation of attack and decay characteristics for the improved age system using an equivalent circuit. Attack time Refer attack loop. T (seconds) - C ( JF) x R (M) where C C2 1 JF and R R out 500 2 .005M T 1 x *005 .005 seconds - .5 millisecond. Decay time Refer decay loop, T (seconds) C fptFJ x R (M) where C - C2- 1 fJLF and R R1 2.2M T I x 2.2 - 2.2 seconds, readily achieved by changing the value of C2. The actual value required for C2 to obtain a required decay time in this circuit...

O

Ki.l fTlMS Htltt VKK1KT NOT SPtQFIE lw* iti i in k im j ss-iszk phone igiji 532 j3 3 po B x 44 h.ith iim, maiijchuwlit 019h7 DECAU COUf tl G UNITS WI TH READOUTS Alwiv rn 0 F'i ( HI popkitj' Himi. nort Hhirwd (o 'n firii nMllc bodI-Ni. I C. wchtti, ami yin rinqlrr tvrt.-l Irir rrjd& ul Ar ri ftgatl Ilwl nnU , tirt brt iT ckrnl bv nl'Sight pn-C I ol Him buittd Ihiatigh r 11 r iii vr i icund and oifl Sevqnl diPI r rnl uflttl irr nT il trff II 4sc t0 mh c Lin-tr ljirri ht 'nuufnri wjfllr'i ihfl...

Wgxn

A Simple Audio Oscillator for Tune-up, Single Sideband for the Radio Amateur, Third Edition, 1962, p. 144, 2. Botos, R,, Breadboard Techniques for I ow Frequency Integrated Circuits Feedback Amplifiers ' Motorola Application Noie AN271, October 1966. 3. Burr-Brown Handbook of Operational Active RC Networks* 1966. 4 Doyle. N., Swift. Sure Design of Active Bandpass Filters, EDN. Vol, 15. No 2, lanuary 15 1970. 5. Dobkin. R., Easily Tuned Sine Wuve Oscillators ' National Semiconductor I...

Rig Of The Month Rules

AH entries in the contest must he sent to 73 Magazine, Peterborough NH 03458 on official entry blanks, Unofficial entjy blanks, imitation entry blanks, 01 reasonable facsimiles thereof, A sample entry blank, which is not official, nor unofficial, but is closely related to an unreasonable facsimile is illustrated below. The very best source of entry blanks is your friendly neighborhood RIG OF THE MONTH participating radio distributor. This is the only source of really FB true-blue entry blanks...

Wheaton Hamfest

The Wheaton Community Radio Amateurs will hold their 11 th annual Mid Wanter Swap and Shop on Sunday, February 11, 1973 at the DuPage County Fairgrounds, Wheaton, Illinois, Hours 8 00 AM to 5 00 PM. SL00 Advance SL50 at the door. We are expanding to two buildings this year. Refreshments and unlimited parking. Sung your own tables. Free coffee and donuts 9 00 - 9 30AM Hams, CB'ers, electronic hobbyists, friends and commercial exhibitors are cordially invited. Write W.C.R.A., Bill Rambox, WB9AVD,...

Lesson Learned

Readers of the aforementioned > Jader congress report wil find that the suggestions made in 73 for hams to have a Washington lobby are backed up completely. Without such a lobby the amateur frequencies are wide open for any group to grab. Only the complete lack of any lobby in Washington for amateur radio made this theft of ham frequencies possible. You might ask your ARRL director to explain again why ARRL has no lobby to represent us In Washington This has been explained in the 73 pages...

Q

One output of Q7 goes to the high-impedance input of FE' Q8 so as not to apply a distorting load across the audio Figure 2 is a biock diagram of the processor. An isolation stage consists of a source-follower FET, offering high impedance to a microphone and driving a single-end to push-pull converter through a manual gain control. This stage drives a

News Pages

You'll enjoy the monthly news reports on what is going on in the hobby - new products - political happenings - news of DX RTTY news Slow Scan news VHF news - FCC news, etc- 73 is the ONLY ham magazine to cover the news of amateur radio in this easy to read manner. Keep reafly up to date with the 73 newspages, Book wanted (give letter) New subscription Gift - please send gift card from ___ . _ .___ 6 Enclosed I I 2 extra if back issues ordered.

Compact Bridge

yafcif 4 Amp GOO Volt S2.00 PLASTIC FIBER OPTICS Ptas nc op' cai rncnoiiberi are con e-ntently card rnounied snd avail-abN1 in fivit diifereni fiber di-ame- tpi Excel toot supplement for B and F Fiber Optic Kits to provide additional fiber optic materat Fibers actable m diamiier of 005 1250fl. card). Offer destgn versatility to H& D md product engineers. Specifications - inu*imuin cent, operl temp. 170 degrees Fahrenheit, acceptance angle -67 deijiees, nurnericiil apertur* 0.55 tran&...

Ihf

Unless tradition has grasped you fry the throat or your concern for t W is limited by your gag reflex, you have a more than passing interest in the use of electronic keyers. They don't seem to inspire the sort of affection one feels toward a good receiver of faithful beam. Still, the keyer invokes the fascination of any good gadget, 'ush a button, turn a knob, and watch the thing go all by itself. The integrated circuit with its micro gates and flip-flops has made the keyer attractive to the...

Po Box Columbia Mo

PHONF i314) 3-3673 TWX 9 0-7& 0-T453 TEKM' H I VP I ,-w nw< . nfr* Nidlvnb'f E tU Mlf i tiP jnd H M I ll iir COD f I IUP coil' I -. n-Hf V > Wi lo TMT- .11 HKiyui Wtl W ii4 Ihr foiown SiJluf b U< r dvp m *i KjPriLr* will Itr I * I nur IT- r, hlfl M f.il iL tl ttw rf4u.uA -r 1-,r jJ nbtl All (Iffti n ' ill 1h- I 'Jlldrnn iLloti .Mill .-.ill pi- 4ll ipt 1 I Iii'I I'pr-l (.'I.I nt I I hnur choin') I n An M iPl MflhrrrH- (th'Ul -> > W S 511 I In- I- -I jIiiIji.I if - III Iniili ll pp...

N

NEW FAIRCHfLD ECL HIGHSPEED DIGITAL IC'S 9258 Dual *'D FF toggles bevond 160 MHZ 4.65 9582 Multi function gate & amplifier . . . 53.15 95H90 300 MHz decade counter 16.00 A 95H90 & 9582 makes an excellent prescaler to extend low frequency counters to VHF or use two 9528s for a 160 MHz prescaler.

Magazine

Allow hams to get acquainted with fetlow VHFers* Exchange call letters, county and state. Count contacts with mobiles in each county worked. Mobiles can work a station once from each county of mobile or portable operation. Let's see some mobiles. Scoring Multiply number of contacts times number of counties worked times number of states worked. Awards Certificate to each station scoring 100 points on six or 50 points on two meters. Certificate to the top station in each state regardless of...

Rd Worldwide Sstv Contest

The third worldwide contest for SSTVers is being sponsored by cq electronoca Magazine. The operating times are 1500-2200 GMT Feb. 10, and 0700-1400 GMT Feb. 18. Plan to use all authorized frequencies on 80 through 10 meters. Each two-way exchange counts one point with a multiplier of 10 for each connnent and an additional multiplier of 5 for each official AR RL country. The only exception is that each VE and W call area will count as a separate country. Logs must contains Time (GMT),...

Price

180,00 195.00 105.00 130.00 S 05.00 125 00 21 5 00 235,00 JYjHWhJ U240 W. Olympic Blvd, Los Angeles, Cafif 90064 213 477 6701 maMmmmmma 931 u Euchd, Anahe m, caiif S28 i 714 772 9200 f Mmmmmm Cr 8ut er> Missouri 64730 sie 679 i 2i WtyrUf'ii tjtrgrxt Distributor t f Amateur linrim Equi,pmmt AVAILABLE AT SELECT DEALERS THROUGHOUT THE U.t> . properly. Except for the 6FGS and cathode ray tube, the monitor is all solid state. During actual operation, an inconrv ing slow scan signal is fed to...

Wblva

Bill Hoisington K1CLL Far Over Farm Peterborough NH 03458 This ten meter front end is highly suitable for use following crystal-controlled converters from six meters up to the 1296 MHz band, or higher. Its mixer output is on 1.65 MHz which places the image 3.3 MHz away, where it is many dB down. 1 will describe in detail the design method and circuit of a ten meter tuner using the Motorola HEP59(J 1C (integrated circuit) in the rf stage for high gain, high selectivity, and no feedback. Also...

Special

Crystals for most amateur 2 Meter F.M. Transceivers Inquire about quantity prices. Order direct. far first class mait add 15C per crystal for airmail add 20t ea 2400 Crystal Dr. Fort Myers Florida 33901 (813) 938-2397 catalog with oscillator circuits and lists of thousands of frequencies in stock. Almost Ail CB Sets, Trans, or Flee. 2.50 iCB Synthesizer Crystal on request) Any Amateur Band in FT 243 1.50

January

Picture made using the Polaroid Print Copier for SSTV. experimenting will be required to see just how much writing can be used and the size of the picture that you can use, but this can be determined without much difficulty. Picture that was used to make transmit picture using copier. Notice that in previous photograph only the head was actually transmitted. As for acquiring one of the Polaroid Print Copiers - Model 230 it should not be too difficult. The copiers cannot be used with the newer...

Collins Updat

To cover the new phone frequencies without having to switch down to the next lower 200 kHz segment on your rig, replace your hf oscillator crystals with the following 80M-6855 kHz, 4QM-10255 kHz. This will allow you to tune 200 kHz segments of 3700 3900 kHz and 7100-7300 kHz, Thanks to W4NJF, The tRC bulletin announced the topic of .94 repeaters with the heading KA-BAM And that's about what happened at the council meeting October 15, 1972, at Michigan City. Many points about the pros and cons...

Waller Electronics Test Equipment Sales

Box 9913, Chevy Chase, Md. 20015 The TE SCO PAD'' has no tuned coils to go off frequency, mo tuning necessary or even therei Its alt in one Black Box I.C. ready to go. The TESCO-PAD has a 1 second hold up for your transmitter,, complete P.T,T_ operation, available with dual audio output levels 12 or 16 tone combinations

Unidyne

COMPATIBLE DECODER urw contain* notch lilter to prevent dnnoyinQ rone txnif mpur hom tk-ng rctrJtunilttd Fully artjustdbLi* rafigp and window for bunt trequi Ticy. length md jmpJ-ludi Cart itr-fo C to o*event reueater drop-out during input signal Fad REPEATER CONTROL unit compJl wth LATEST FCC REPEATER R Jt I S indjdiing acfiuttahk- trrrx t far 3 minute prqleclioo arid & teoand came' delay drop out Inctudet COS CARRIER OPERATED SENSOR for use with ar without relay WRITS FOR COMPLETE SPECIFIC...

Vhf

Crystal Controlled CONVERTE RS for DX, FM ATV, Space and other uses. Extremely sensitive aacl free from spurious responses. With A.C. power supply. Choice of J-F many 'n stock. Upgrade your station to JAN El. 50 MHz 2,0 dB NF 144 MHz 2,5dBNF 220 MHz 3,0 dB NF 432 MHz 5.5 dB NF Ail postpaid. Write for full details. Also pre-amps. Ask about our OSCAR special 435 MHz converters. P Q 8ox 112

Electronic Feather Touch

Detects mere tourh of finger. Use as single or twin lever key- Operates with alJ positive or negative ground digital keyer . ( Remote S S Swts. for MM 500B and MM 8000) 27,95 DATA ENGINEERING, INC 5554 Porf Royal Road, Ravensworth Industrial Park, Springfield VA 2215 I come tower, antenna and alt. By canvassing boat yards I received a donation of a rusty boat winch about 3,000 ibs. capacity. After much wire brushing, a coat of paint and replacing the drum shaft...

Oeq

The famous sealed helium filled Balun . . . employed with the DGA Series Antenna Systems. Solderless center insulator and easily handles more than full legal power while reducing unwanted coax radiation. Equipped with a special SO-239 type coax connector and available either 1 1 or 4 1. MODEL DGA-2000-B 12.95 Postpaid in U.S.A.

Indxa News Letter

During the past 2 years Indxa has been associated with a few DXpedi-tions. I define a DXpedition as one or more hams going to a specific place at a specific time for the sole purpose of making as many QSOs as possible in a time span of 2 days to maybe two weeks. Below are shown the result of a few of the operations, that the results are about what you would expect, but the weigh to be attached to each factor is not so evident, i,e is it belter to have more operators, or one operator with a beam...

Im M M M M

TYPICAL TELREX MONO-BAND ANTENNAS - Monarch, 10 DBD, 3 EL, 4 KWP, 2-1 2 O.D, 17' boom - Monarch, IQ DBD, 3 El., 8 KWP, 3-1 2 O.D, 26' boom - Monarch, 14 DSD, 6 El., 6 KWP, 1 O.D, 9' boom Monarch, 16 DBD, 8 El., .8 KWP, 1.375 O.D, 14' boom Monarch, 13 DBD, 5 El., .8 KWP, 1.5 O.D, 16' boom many, many more send for PL-71 Dept. C 175.00 355.00 39.95 59.00 63.95

Last Minute Additions

NE566 Function Generator, DIP 8 pin) , . . S3.50 ea. NE567 Tone decoder, DIP (S pinl 3-50 ea, 7447 7 segment decoder driver 1,30 74181 Arithmetic Logic Unit, 24 pin, DIP 4.50 8261 fast carry for above 2.00 8223 256 bit bipolar field programmable, read onfy memory 7.50 8570 9 bit St, PO. shift register 42.50 LED Red Emitting Lamp S,60 All IC's are new and fully tested leads are plated with gold or solder. Orders for S5 or more will be shipped prepaid. Add 35i...

Detail W

By sighting at the end of (lie boom, look at the three pieces of conduit and make sure that all three are parallel to each other, then tighten all the muffler clamps. Now the remaining portions of the elements are placed in their respective places and finally the hose clamps are installed and tightened. When you do this make sure that the drain holes are on the bottom facing the ground. On this particular antenna, a gamma match was tried and when adjusted properly, proved...

And The

Prose Walker, Chief Amateur and Citizens Division Federal Communications Commission Mr. Walkers speech was given before the Pacific Division Convention, ARRL, October 15, 1972 at San Mateo, CA, and at the South western Division Convention, ARRL, October 21, 1972, at Santa Maria CA. Although there are many other subjects of immediate importance to amateurs, I would like to discuss today the question of the allocation of amateur bands. There is no more urgent and time-consuming task, in my...

Ina

Burrill K7JVZ 224 13 h Street Sparks NV 89431 Every owner of a Heath HE22 or HR 22 I can continue to enjoy full phone hand coverage with this modification that permits operation in the new 7.150 to 7.200 MHz sub-band recently allocated by the FCC. It can be safely assumed that the HW22A single bander from Heath and its equally popular sisters the 1 and 3 2A are in use by the thousands on 40, 75, and 20 respectively- Let us consider for the present the HW22 and 22A 40 meter unit. This...

Linear Special

Ten (10J operational amplifiers wtth a two poge sheet of application notes covering the basic cir cuits using op-amps 5 55 each Op amp package 10*741' . data sheet and applies t.on notes 14 DIP, 8 DIP choice only S5 00 LM I (Hi positive voltage rcg. , so 747 dual 74 I op amp DIP 100 LN1302 volijpe follower op-amp 1.25 7< 14 operational amplifier , . , .35 71U voltage comparator 50 LM 309K 5 V-1 A power supply module----- . 2.50 LM 380 2watt Liudio amplifier 1.50

Kcll

* Self completing dots and dashes, - Dot memory for easy keying. * Precision feather-touch key built-in. * Sidetone oscillator and speaker built-in. * Relay output keys 300 V 100 ma. * Keyed time base- Instant start. * 5-50 wpm. Perfect dot-dash ratio. * Send QSL or postcard for free brochure.

Srcu

Ultimate in a 2M FM Transceiver features AC & DC supplies Built In 10W (1, 3 & 10 selectable) Plus many more exciting features. For detailed information on these, the complete Standard line and the name oI your nearest dealer write 213 775-6284 639 North Marine Avenue, Wilmington, California 90744

Txu

Consequently the equation forband-with should be The next to the last paragraph has a few words missing from the second sentence. The second sentence should read The gain of the filter is about unity for 800 Hz, so there is Iittie change when the filter ,s switched in or out ' but a comfortable level phone signal with the filter outrr disappears when the filter is switched in. For what it's worth, the article seems to have rung a betl for many of your readers, because I had letters from several...

F

Test new circuit ideas I.C. circuits discreet components at no risk AH you need are mounting screws . . , just plug-in components , . . like Va watt resistors, ceramic capacitors, diodes, I.C.s, transistors and more and your circuit's built No special patch cords needed Components interconnected with any solid No. 22-26 gauge wire. And you can try it with absolutely no risk for 5 days. If not satisfied, just return your EL Socket and receive a full refund. Trying is believing. How can youi go...

Repeat

Puts you in tomorrow's channels today 220 MHz FM is the early solution to overcrowded 2 meter channels. Here's your chance to get in on the ground floor of the FM future. The new FM-21 all solid-state transceiver is an opportunity to iJdo it right11 this time and start with the leader. The FM-21 uses only 1 crystal in any channel , , . one crystal gives you a separate transmit and receive frequency as well as automatic 1.6 MHz programming in the ire-peat mode. We call this unique triple-duty...

SN

To first decade scaler pin 14 5n74 90 cies less than 10 MHz only, you could build a transistor amplifier using almost any fast switching type. In that case three or four read outs would be satisfactory. Then there would be no need for the different integration times so the SN7454 together with the switch could be left out. If you really want to cut it down you could use the power line frequency for the time base dividing by six to get A second integration, throw in a SN7490 to get one second. I...

Nt Cw And Novice Transmitter

CHARGE IT On your Master Charge Bank Americard or Uni-Card. Spread payments up to two years. We carefully pack and ship ham gear, accessories and parts to most any part of the world. Address your orders to 18 SMITH STREET Farmingdale, N.Y- 11735 Or - Phone your orders to (516) 293-7990 Ham Headquarters, U.S.A.

If You Want Prompt Service

ON AMATEUR PARTS & EQUIPMENT - - WRITE US - - We stock many major lines, including SWAN I EXPERIMENTERS SUPPLIES I DRAKE I TEMPO CORNELL DUBILIER t G. E. TUBES i MOTOROLA IHEPI HY-GAIN CALIFORNIA CHASSIS I MINI PRODUCTS TEN-TEC I CALECTRO I B & W I ANTENNA SPEC. CUSH CRAFT I BOOKS & MAGAZINES I NEWTR0NICS ROHN-SPAULDING I TRI EX ALL SAMS PHOTOFACTS REGENCY I OMEGA-T I KENWOOD I COLUMBIA PROD'S Please include postage with remittance. 6213 Thirteenth Avenue South Seattle, Washington...

Repeater Group Activities

One of the great benefits of repeaters is being passed up - more's the pitV- Every member of a repeater group has one thing in common the ability to communicate through the repeater, For some strange reason this unique ability is not being taken advantage of. There are severai valuable functions that can be carried out via the repeater functions which might help to build the ciub in members - in prestige - and in service, Obviously the repeater can be used to carry announcements of interest to...

Shipmates Sought For Round The World Expedition

YANKEE TRADER 180 foot, 1100 steel hulled vessel, formerly well known for Coast Guard research, is now being refitted and air-conditioned in Miami by Captain Mike Burke of Windjammer Cruises' fame. The yacht has traveled to the seven seas, and will once again embark on a pleasure seeking adventure around the world beginning on January 15, 1973 for a nine month cruise following the trade winds in southern waters. Shipmates who will share in the adventure and expenses are presently sought for the...

Rm

Before the Federal Communications Commission In the Matter of Amendment of Part 97 of the Ama tear Radio Service Ruies to revise the station identification requirements for transmissions of fess than I wo minutes. Order adopted October 20, 1972. Released October 20, 1972. By the Chief, Safety and Special Radio Services Bureau* 1. The Commission has under consideration a petition filed by Michael R. Beverly proposing amendment of Part 97 to change the station identification requirements for...

Pdo

I jp.ro lucihij the ttl& St 1& M, compact . t tfi-C i-tl.---.irt electronic 1 Los) kit availAbl nytttiLfera THE TIM.I MACHINE J'.HUes the L& toar i Jectncmlc tLr htil-.iuea and ad 'JiitJts to pravtdo Time infoemfltinn Lik no cloak nag before. A Large ScaLf integration (LSI) circuit provides the logic to conver* the 60 hertz Line frequency into a dtsplayable time. Internai options include a previal'Je fllanr r fcul five minut -not ze. arid 2 hour time

Universal

12-D1GIT CALCULATOR ON A CHIPM Similar to Mostek fiOOl. Outperforms Texas S* i diffit TMS1H02. A 10-pin DIP. Add , multiplies. HuhlrnCta, iincl divide . L-se With 7-segment readouts, Nixies, and LKD's. We include ache-malir,H, instructions from factory lo build ciih Jfc ulatm 3 'or 35 p.clufie SN7-IU0. tier ide Counter, . S7-i7r> laich. SN7 i i I Bn> delaxier driver, -to- Nixie ub -, instructions. Amplifier i mm Lf . implifi 5 Q V'f TlOrVVIfn Cov r* 535 Kc* lu J 4 . rVki hi 1500 Kct...

Spectronics East

Box 1 457h Stow, Ohio 44224 (216) 923-456 The FT-2 AUTO will operate from either 117 V AC or 12 V DC power sources. Receiver transmitter specifications include selectable 10 Watt or 1 Watt power-output levels a frequency-adjustable tone-burst generator for repeater activation 0.3 uV sensitivity for 20 db quieting 10.7 MHz crystal filter, in addition to a 455 kHz ceramic filter, for superb adjacent channel rejection adjustable deviation and mike gain controls Hi-Q slot-coupled resonators used in...

Tentec Receiver

> L_t itUr Inc. has announced the introduction of the Model 315 Communications Receiver to their line of amateur radio equipment. Completely solid state, the receiver covers the amateur bands between 3.5 MHz and 30 MHz, Features include permeability tuning, linear frequency readout, 9 MHz crystal lattice i-f, pulsed crystal calibrator and low noise MOSFET rf amplifier and mixer. Built-in regulated 1T5V ac power supply can easily be converted for 12V dc operation. An accessory p ug-in audio...

Aaq

Power supply schematic. t oJtage can be varied by changing the R1 R2 ratio. tor. The schematic and P,C. hoard are sliown The crystal calibrator can be used to check any two meter channel provided ii is a standard 30 or 60 kHz spaced one. To determine if the frequency to be checked is standard just divide by 30. It must work out evenly e.g. (146.94 wilt divide by 30), The receiver padder can now be adjusted for a zero discriminator reading, he transmitter is checked indirectly by using...

T

Assemblies of mixer and oscillator and last, the rf stage, mixer, oscillator and receiver. My advice is to use the last mentioned assembly plus the mixer output tuned circuit. This really peaks things up and drops i-f leakage almost out of sight. M leakage occurs when you pick up an unwanted signal directly on the i-f frequency with your receiver. he importance of getting rid of i-f leakage is very great. I wo things will do this for you. First, plenty of signal from the converter, which simply...

Rotary Thumbwheel Switch

Brand new digftill switch, vati ible with nutpu* w straight di-curiitl lcwmr or bcd. w (iely used 10 set up fkedetif mined count* of m rf vafs.d iui va u of dkjital-to .analog quoi i iire pe* decimal output ho portion) rtsdco 2.36 binary coded decimal rtsbcd s2.3g output 2n1015d npn s'l con 20(nv powiir amplifier 200v 10a s2 00 10for si i.& oor 100 lor si50.00 SAN KEM HYBRID AUDIO c-. i AMPLIFIER MODULES, w& have made a tortuoate purchase of sdilken aihjiQ amplif'et hv br jtf motiuit v w...

Ma E

Less vibrator__ __ 25__ 25__ TX narrow band, 1 less final tubes 18 25 25 S30 12 Note MA E42 wide band_____ 14 Progress Line Case, consisting of front basket and front plate with lock Low band dual front end, 2 freq. strip Hi-Band TPL RX with TX exciter strips less speaker, as is, missing parts Si 15,000 2-way FM mobile units in stock Send for new 1973 catalog For the most powerful antennas under the sun There's nothing half-way about the new Hy-Gain REPEATER LINE. Designed for the man who...

N V W

Overall bJock diagram and mixer detaiJs. The complete unit measures only 6 by 4Va by 3Yz inches. Four separate PC boards were used for building the crystal oscillator, amplifier, power supply, and the crystal calibrator. The overall block diagram is shown in Fig. 1. The crystal oscillator schematic and board are shown in Fig. 2A and B. The frequency of the unit isne not

Outrjt

Biock diagram of speech processor. output of the system. Q8 is an emitter follower driving transformer TI. which in turn drives a full wave de rectifier supplying the ALC voltage. The magnitude of the feedback voltage is controlled by R40, an internal 2000 2 0.1 watt trimmer pot, which is set safely below a point of system instability, Insufficient response to low frequencies, as when the primary T1 is too smatL results in too little ALC for the low frequencies and thus overall...

Active Editors

Only one ham magazine of the four has editors that are active and on the air and have been for years, 73 has its own repeater going the only ham magazine staff that has done this. 73 has its own mountain top laboratory for VHF the only ham magazine with one. 73 is active on siow scan television - the only magazine to do this. 73 goes on DXpeditions - the only ham magazine to do this. 73 runs DX tours the only ham mag to do this. And so it goes- And what difference does all this make Perhaps...

Rejection Notch

Section is a very effective tunable notch filter that will tune out any unwanted continuous tone such as a heterodyne. It tunes from 350 to 6000 Hz and its response is shown in Fig. 2B. Figure 2C shows the overall response of the two sections. The notch can of course be moved in or ouf of the passband. The resulting hole in the audio response has little effect on speech, and if no heterodyne is present, it can be usefully adjusted to produce some improvement on certain signals. Figure 3 shows...

Check These Specifications

GENERAL POWER REQUIREMENTS 12 to 14 VDC Current Consumption at 13.5 VDC Receive d amps squelched, 1.2 amps unsquelched. Transmit 6 amps max. DIMENSIONS 1W x x Wa * deep 4 lbs. net TUNING RANGE 146.00 to 148.00 MHz, continuously tuneable with reset capability of approx. 1 KHz to any frequency in range, SENSITIVITY .35 v max. for 20 db quieting +lpv for reliable squelch action. SELECTIVITY 11 KHz at 3 db Less than 30 KHz at 70 db. Adjacent (30 KHz spaced) channel rejection more than 70 db. AUDIO...

Microphone Output

Resulted from an attempt to reproduce tfie solid state processor of WB2EYZ (see Reference I h substituting NPN silicon transistors for the PNP germanium types. It was noted in the author's experiment that any appreciable amount of ALC feedback would cause the unit to multivibrate. Even if this was not happening, the ALC voltage would have a sawtooth waveform, which manifested itself in a speech waveform having a sawtooth haseline and a variable gain from one peak to the next. The reason for...

Communications

COMTRON Model 960A DC Mobile Unit New as-is. Complete 129.00 This unit is all solid state except the driver and final output tubes which are instant heating. Unit is 150MHz Front Mount type 30Watts. Two channel deck included free. MOTOROLA Model X53GKT mobile unit with accessories 139.00 This unit has two 60Watt Hi Band Xmtrs and one Hi Band Receiver for multi-channel operation. Transistor Powered. GENERAL ELECTRIC Model ME33 Mobile Unit vuith acc S89.00 This radio is vibrator powered, will...

Tempo

As new as tomorrow The Tempo Commercial Line VHF iransceivers offer commercial performance at amateur prices, Both units include an audio timitor to assure constant deviation at all times and an rnstantaneous impulse squelch. Microphone, power cord, mounting bracket and one pair oi crystals is included, * Frequency Range 220-225 MHz (2 MHz operating range) Number of Channels 12 channel capability for transmit and receive Microphone Dynamic with coil cord * Dimension 2.36 H x 5.90 W x 7,66 D *...

With Drilled Board

BETTER THAN .3 JLlV SENSITIVITY 15 KHz BAND WIDTH ONE WATT AUDIO OUTPUT DUAL CONVERSION 10.7 Mhz AND 455 Khz IFs ALL 1C EXCEPT FOR FRONT END STANDARD 45 Mhz CRYSTALS OPTIONAL CERAMIC FILTER OPERATES FROM 12 VOLTS NEGATIVE GROUND Order TX-144 or 220-S39.95 PA-144 or 220-S29.95 RX-144 or 220 59,95. Receiver with 7 Khz ceramic filter - 65.95. Include 1.00 postage and handling for each kit ordered. New York state residents add 6 sales tax.

Ic Bonanza

Brand new DTL dual inline (DIP) package, factory marked ceramic type. The price is too good to be true. Fully guaranteed and with specs. 930 Dual 4 input NAND gate similar to 7420 931 Clocked flip flop 74110 932 Dual 4 input Expand Buff 7440 933 Dual 4 input expander 7460 936 Hex Inverter 7405 945 JK Flip Flop 74110 946 Quad 2 input gate 7400 962 Triple 3 input gate 7410 1 5d each. Buy S100 worth and deduct 10 , 24 hour delivery guaranteed. GIANT B 7971 NIXIES (2) with 2 sockets and driver...

Free Books

Any one of the following books is available (postpaid) as a premium if you buy a subscription to 73 for yourself or a friend (or an enemy or even an ARRL official since few of them get it)- One book per subscription. A The Novice Ctesc License Study Guide has not yet been published in 73 or in any other maga iin , Thif book coriami ail the baste technical informat ion needed to pass the Noviep L> ense with flying colors and is invaluable as a basic text for understanding the General Class...

In V I W

Crystal calibrator schematic. No P.C. board Jayout is given but boards are available from source given in the text. * CAN USE TOTAL FIXED H OF 6.2K, 3UT SETTER TO USE SK POT. AND SET FOR 0 m A TOTAL CURRENT Fig. 6a. Schematic of the audio amplifier. The rt attenuator must have a usable range up to 150 MHz. I used a Jerrold Model A-72 attenuator with the unit to provide up to 82 dB of attenuation. First the signal generator must be calibrated against a known rf source. I found that my...

Inc

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

Fair Radio Sales

1016 E rURIKA Boa MOS IIMA, OHIO 4SB02 sible for satisfactory results. It is jiso important that the age voltage does not fall away too fast between words or code characters, otherwise a peculiar gasping effect becomes apparent. A decay time of not less than 1 second will be satisfactory in overcoming this gasping effect. ( is common practice to switch a larger value of C in parallel with the age filter (as shown in Fig. 1 > to achieve two rates of decay, one for AM, the other for CW-SSB. To...

Memory Matic B

500 or 800 bit R W memo ry, Stores either a single message or a number of sequential messages. Message Stop for char, insertion. Near-full and Overload alarms, remote control for Stop Start of message, Incl, SM-21B features. Sh, wt 4 lbs.(500-bit memory) 198.50 BOO-bit memory) 219,50 Cal, receive and transmit crystals in 10, 6, 2 and, VA meter FM bands, Markersfor all FM channels. Check deviation. Precision 12 MHz crystal. No unwanted markers, Osc. and output buffered. Sh, wt * 2 lbs, (Less...

Mores More Books

F The FM AnthoJogy has reprints of all the articles and technical data from the arty issues of the FM Journal. Mo FM library if complete without this data, much of > t just not available elsewhere. 5.95 value. F The FM AnthoJogy has reprints of all the articles and technical data from the arty issues of the FM Journal. Mo FM library if complete without this data, much of > t just not available elsewhere. 5.95 value.

Also Complete Lines Antenna Systems And Ham Gear

Hy-GainT Mosley, Telrex, Cushcraft, Wilson, A S, Newtronics, Collins, Drake, Galaxy, Hallicrafters, Ten-Tec, Tempo, Regency, Clegg, Tri*Ex( Rohn, etc., etc. LET US QUOTE AND SUPPLY your EVERY need. ONE STOP service. -Communication Specialists for over 34 years -1960 Peck Street, Muskegon. Michigan 49441 Tel. (616) 726-3196

Strikes Again I

Miiton L Mitchel K5LKL lost out to a bit of unethical Christmas shopping last month. The Cloaked Cfaus walked off with an Eimac AF 68 Ser No. 10888, Ermac PMR 8 Ser. No+ 10918, and a Ml070 power supply. An RCA model AR88 with a non standard S meter was also taken. Please contact Milton at Section A, V.A. Center, Temple TX 76501. A Tno TR2200 Ser. No, 241969 was also politely lifted from the locked automobile of Ed Pores WA2ZBV. Anyone with information can reach Ed at 16 Dorchester Drive,...

Test Equipment

Fluke 803 Differential AODC Voltmeter, 150.00 H-P 3526-A Tape Transport, for or ltape 15 16, 1 7 8, 7 15, 60, 120 Inches per second. Less heads. S400 00 H-P 56I-B Digital PrinteT 85 00 DATATOTAL I 141-8 S Jigit printer, - . 25.00 Kejthley 150A Microvolt-ammeter 100.00 APR-4 receiver with CV-253 Timer, 38 1000 MHz. I 15 v. 60 Hz 175.00 B & K 1076 Television Analyst (Flying spot scanner) > , t 195,00 Brush L-202 2channel chart recorder 40 0 Type C dual-trace plug-in for Tektronix (made by...

Led Readouts

Knaps In IJ -pin Dll* A .socket jkA characters Y*xVti '-5 V, O-mllH p r M-K. Famous MAN-1 type. Sockets .50 ea. ThU display i i xrellcnt for .riiull portable lecitr nicfi, ttiifh ls DVM's, calculatorsj ele. I iuivalsai 1- Monsanto MAN tA, Operate.-* from V, 20 miJllfttnperes. with 4 7 crhrn dropping rotator- Rescript ion Tri'Stiit*- CJuad Buffer . . Tri-Staii- Quad Buffer , . . Tri-State Quad Hufler - . , t-Bit Comparator Parity Generator Checker Programmable iiO r i...

Powerhouse

The ALPHA 77 has got to be the linear for the discriminating amateur who demands quality and perfection for his si ock. It is not just an ordinary linear built for ordinary ham use. It features Iheavy duty construction and is designed to operate at 3000 watts PEP phone input on a continuous duty basis. At the legal limit of 2000 watts (taking into consideration the intermittent type of service that occurs in the normal SSB operation) this amplifier is practically snoozing. It employs a single...