W Be Minature Broadband Rf Amplifiers

Flat 20 dB gain over entire bandwidth 5 dB NF 1 V max output Specify 50 or 75 ohms Rugged cast alum case +20 VDC 25 mA bias Models A82 & A82A 1-500 MHz, high precision, fiat .2 dB Model A82H 4-450 MHz, economy version, flat .5 dB Size A82 2 1 4 x 1 3 8 x 7 8, A82A & A82H 2 1 4 x 1 3 8 x 7 8 Price A82 105.00, A82A 97.00, A82H 45.00. These preamplifiers are deal far use with frequency counters & meters, signal & harmonic generators, detectors, single & multiple HF & VHF...

Transportation

20 The FCC As Seen By 24 Introduction to Micro Transistors , , , , , . K1CLL Buiid this Gm transmitter. 31 Build a 2m Frequency 37 Repeater Government 41 The Heath HWA 202-1 Any Reader test report did he like it 43 Simple Power Supply for Digital 45 Flood 50 The GDO, the VOM, the Each has its place when repairs are called for. 51 Selective Calling Via 55 How To Stop Antenna 61 Two Meter Lids - 64 Two Meters Ain't Twenty 65 Mighty Motorola Those SQD's are cheaper'n rice t> oxes< 67 AM on...

Wayne Takes Pictures

Here is W1EFF of the Northern Berkshire Amateur Repeater Club picture taken at one of the 73 Magazine FAi Symposiums WA1EQN, Nick, of the WRJdBT, New Ha ven. Henry WIAUY, motorcycle number 7Zf stopped by i ie 73 offices for a visit, Henry can be worked via WRIABU in Concord NH most any day. Tony, WA10ND, also of WR1ABT in New Haven. Lew McCoy WHCP, secret 73 doub e agem operating out of AKRL HQ. Rag K1ICF, one of the very active repeater owners of New England, particularly on 4S0 MHz. You'll...

MHz if

Here is a 1.65 MHz i-f strip, all built into a minibox, for use with VHF converters. Why build something like this Well, I made the unit to go with my 432'er transceiver, but it certainly will work with just about any HF or VHF converter to provide good selectivity and high i-f gain along with adequate image rejection. Besides that, how many good transistorized i-f strips are there around these days The two transistors in this amplifier give you all the gain you can ask for when used with a low...

The Threewire Dipole

After having been on the air a year or so, I ran into an old timer who was running a 3-wire dipole. I was running an ordinary dipote on 40m and a folded dipole on 75m, but had given no thought io a 3-wire dipole. He mentioned that it was a good antenna I thought it would be an interesting try. So, one spring day, with nothing much better to do, I solicited the aid of the jr. Op, and we commenced the 3-wire dipole. First you need some spacers. About this time I ran across someone connected with...

Bi

He agreed to look for the application and to call me during the first week of 1974. No call was ever received. In mid January 1974 delegates from the Colorado Council of Amateur Radio Clubs, Inc,, on behalf of the more than twenty amateur radio clubs and repeater groups they represent, went to Washington, D,C. where they expressed their views concerning the incompetent actions of the FCC in regards to amateur radio repeater licensing. The meeting fasted two hours. There...

Your Gear

Tell us what you have Here's a partial list of what we want 51A RT-698 ARC-102 131 . . . Magnavox FM-622 134 . RT-859 APX-72 . . . RT-246 VRC . . . , . . R-390A URR . . 94 . , . AN TRC-68 . . . AN URC-9 . . . . . 49pT-1 618T-1-2-3 S1BX . . . AfV PRC-25 . . . . . Wilcox 807 We buy all types of military test equipment. . . radios etc. Do vou have a TS 683 TSM crystal impedance meter, H P or TEKTRONIX equipment If you hate we'll trade for NEW ham gear But if you love green stuff, let's trade YOUR...

Dx Stations

As a fellow amateur 1 thought you might be interested in an incident that happened to me recently. It was a fairly fine day except for the band conditions. About 2100 GMT I heard a 14JJV calling CQ DX on about 14.204. A perfectly clear frequency since everyone tvas up the band calling the KP6 station. I gave the 14 station a good clear slow call. Upon signing the initial call to him I was totd in the rudest way that the frequency was in use. I was sworn at in the worst way. Not one station...

Equipment Closeout

The following equipment has been in the original cartons or else like new purchased by 73 Magazine for test or after a few days of testing in the 73 has been received in lieu of payment labs, for ads. Most gear is either brand new MITS 908M Calculator w p,s. case ( 143) new S 79 Vanguard Scaler f by 10 - to 200MHz ( 120) S 75 Pickering CW keyboard KB-1 ( 265) tested S 155 Motorola KW 2m amplifier used S 375 Heath JC-2009 calculator-brand new (S92) S 79 Signal One CX7*A-testedkperfect-Nke...

Those Who Have Bought The Processor From Us Or Rgs Or Cybertronics Who Are Interested In Sharing Hardward And Software

8008 PROCESSOR 8 bit on a chip 50.00 21G2102 2602 N CHAN Bit static RAM. SPECIAL FOR THIS MONTH ONLY 15.00 TTL SPECIAL 74175 Quad Latch 1.10 MOS DYNAMIC MEMORY 1 x 1024 bit MM5260 5.00 LINEAR SPECIAL 741 Mini Dip op amp 10 3.50 LM 309K 5V 1A REG . 1.75 LM 320K NEG Reg available in 5V 12V& 15V 2.25 LM 340K POS Reg available in 6V, 8 V, 12V, 15V, 24V 2.25 4194 TK adjustable dual tracking reg T066 3.90 4195 TK dual tracking reg + 15V T066 3.40 iCs, most TTL & LINEA R in stock CMOS DIGITAL

Info

Complimentary transistors used in electromagnetic deflection circuits. In a bind, try 2N697s for the NPN and SK3020s for the PNP. If current requirements are exceptionally high you can always parallel two of either type. As the scanning frequencies are low, we can pull quite a few short cuts like this. Recently, Harry Mills K4HU, furnished us some very interesting information on the early scanning disc TV system I mentioned in last month's column, Harry, who dunng the late 20's was an engineer...

Ranjit Kaur Gurbux Singh

hope this letter finds you in the best of health. I am well and wish you the same. I don't know if you remember mer but maybe the following will refresh you, I am the etdest son of Tara Singh XZ2KN of Burma. When you were in Rangoon, I had asked for a pair of golf shoes and some badminton gut and you had sent it thru Dr, Charan Singh, 9V1NR of Singapore. At that time, I was trying to get a visa as an immigrant to USA. The official Red Tape was stalling and to make matters worse, I was taken...

Call Book

When you want an authoritative, up to date directory of licensed radio amateurs Over 210,000 QTH's in the DX edition DX CALLBOOK for 1974 Over 285,000 QTH's in the U.S. edition U.S. CALLBOOK for See your favorite dealer or Send today to (Mail orders add 50 per CALLBOOK for postage and handling)

Is

The AR-2000 is a completely solid -state, dual-channel communications receiver with 0.15 uV sensitivity 10 dB S N N and selectivity that renders it virtually interference-proof more selective than you ever thought a receiver could be . Blocking, intermodulation, adjacent-channel and crossmodulation rejection characteristics are better than any other receiver on the market and are typically beyond the scope of measurement. This plus modular construction digital frequency readout all bands...

Wbjyr

Only Standard offers you an Amateur Radio with a no-fault Life Insurance Policy that can save your radio and your pocketbook, should your Standard ever need service after its regular 180 day Warranty expires. Your out-of-warranty cost Model SR-C806 Modef SR-C826 M Model SR-C826 MA Our exclusive Astropoint Radio Life Insurance Policy costs nothing at time of purchase, and will guaranty you a flat rate for repair after the regular 180 day free warranty expires. After an out-of-warranty repair, it...

Its A Call

QST, QST, Q5T Our new WR call has arrived ' Thus our trustee, WA6AGA announced the event Tuesday afternoon, June 26th, just 5 days before the July 1 deadline, and 3 days before the announcement from the FCC of a 60 day extension, I'm sure the members felt almost as they might have at the announcement of the uncomplicated birth of a son. After months of trying to meet FCC's complicated requirements for a repeater license and 2 submissions , the best repeater in all of Six land, WB6AAE, had its...

Ground Point On Door Frame

EJectricial diagram of gutter mount XA antenna. antenna mounting is shown in Fig. 2, The advantage to such a mounting scheme is that the antenna needs to be only 4 A long and, therefore, can be made to be quite sturdy mechanically. Also, since the ground point is fixed, the antenna can be removed or placed on the rain gutter at the same point as often as desired without any effect upon the transmission iine SWR. There is no series capacitor or other tuning reactance needed at the base...

World Qsl Bureau

200 Panama Ave., Richmond OA USA 948041 THE ONLY QSL BUREAU to handle all of your QSLs to anywhere next door, the next state, the next county, the whole world. Just bundle them up please arrange alphabetically and send them to us with payment of ti each. DiM.rttn n-T for Sjpsriini tt f n fi IS- .,Jfjv JRM A OflN flkii in intlilbHoTt nm w 31 watftbt I May return prorirfr. Add shipping lor i modclv 01 tw phcjbc tmtyt 11 VAl U2.95 J0M for PKR amp phoney U K 143 5 iOiii uu PKRA phone, gt IX WH 1...

CO

Pnc S2 iief 25 tor non commfrrct adi 510 per 2 amp words for bunnesi veniiir display JdS Or agency discount InriuifJp your check order Deadline fof ads is the 1st oi the month two momhs prior to publication For tf ample January Isi is the deadline for Ihu March issue whjrh will be mailed on the lOih ol February Typa copy Phrase and punctuate Sicily as vou wtsK it to appear No all capital ads V iEi will be the judgs of suitability ol ads Our responsibility lor errors exiend amp only o print mq a...

Bpd

Using the EBC-144 Jr. 2m Transceiver Synthesis, with no limitations, is the name of the game with the new Emergency Beacon transceiver, For the first time we were able to dial up even the most oddball of repeaters. The ads for the Emergency Beacon Dream Machine transceiver a rig which could obviously do everything, including scanning, total synthesis, tone burst, continuous tone, Touch-tone, 600 kHz splits, 990 kHz splits, one meg splits, simplex and you name it the ads for this rig got a lot...

Wkbc

After seeing how hot those TV-type tubes in the final of my Galaxy V Mk 2 were running and having one go out soon after installation, I decided to install a small fan above that section of the rig where these tubes are. The fan is a small open motor unit with a 4 in. blade, which sells for about 2,50 at several of the radio houses. Mine is mounted on aluminum brackets on a pegboard and is about 2 in. above the top of the transceiver. Any of several methods may be used for mounting, depending on...

Calculator Clock

The Corvus Calculator clock is quite unique in concept. The idea of combining a clock MOS chip with a MOS Calcufator Chip appears to be a natural, The calculator provides addition, su b traction, multiplication, square root, division, percentage, reciprocals. The unit displays 10 numerals. The decimal may be set to float or fixed at 2 or 4 places rounded off to the closest digit. The clock chip may be set by a three position switch to display time only, date only, or alternate time displayed...

Track

Same type unit found in the mum expensive home tapc players jtb a complete 8-track player system with I I IL.T-1N VREAMP Junt plutf into any stereo amph- I fier tse some of r gt ur low-priced utmt . Excellent replacement unit, ur yc 1 lj can design yuur own high- t quality st ft re o lapu system. It's the type you insert a Cartridge to turn-on rlciclt, then rnjoy up to HO minutes of non-stup, non-repeat stereo. Remove ciiriridfre and player shuts off tiulnmut cuUy. Huilt-in output controls m...

Elmenco

C3, C6 7-60 pF compression trimmer capacitor. ELMENCO 404 C4 7 100 pF compression trimmer capacitor, ELMENCO 423 C5 1.8-8.7 pF miniature variable capacitor, E.F. JOHNSON 167-104-1 S1 DPDT selector switch It has been said that familiarity breeds contempt and also that a little knowledge is a dangerous thing Both seem to combine to cause hams to use extension cords improperly. We're familiar with wire and we know about voltage drops. Unfortunately, we tend to push extension cords past their...

Ht

The very popular HT-220 handi talkie has suffered many modifications at the hands of amateurs, but none so extreme or unusual as this one. With apologies to Motorola, I will describe for you my 400 c h a nnel, frequency-synthesized HT-220. This article will cover a general description of the theory of operation. Part I will give the actual circuitry used in the rig. This is not a construction article, as such, although the experienced builder should have no trouble duplicating the work. The rig...