Udio

Fig. 1 Passive double-balanced mixer. Transformers are trifilar wound on tor o ids. Diodes are 1N914, IN4148, etc Fig. 1 Passive double-balanced mixer. Transformers are trifilar wound on tor o ids. Diodes are 1N914, IN4148, etc Ftg 2. 80m and 40m oscillators and buffer. The output parts of the oscillators and the buffer are the same as that ot Rollema.* For T7, see text. Ever since the Japanese started building receivers and transmitters for us, we hams who like to do something with our hands...

O

Fig, 71 Component layout of automatic vswr meter. All ptn 7s of the integrated circuits have a tab etched to facilitate orientation, meter of known accuracy. I chose not to incorporate Heath's method for calibrating their wattmeter circuit boards because of the tion equipment at work. I husr the parts Heath used were omitted from the power sensor circuit boards The forward-power wattmeter is calibrated first Place the forward cat i bra tion switch to the on position With enough rf power applied...

Info

Drake TR7 General Coverage Digital R O Transceiver Drake RV7 Remote VFO Drake PS7 120 240V Ac Supply for continuous duty operation (25 amps) Drake PS75 120 240V Ac supply for intermittent duty (15 amps continuous, 25 amps intermittent) Drake SL-300 Cw Filter, 300 Hz Drake SL-500 Cw Filter, 500 Hz Drake SL-1800 Ssb RTTY Fitter, 1.8 kHz Drake SL-6000 A-m Filter, 6.0 kHz Drake MMK-7 Mobile Mounting Kit Drake TR7 Service Kit Extender Board Set Drake TR7 Service Schematic Book

Omnic

With new coverage and new features to make it better than ever AH 9 HF Bands. From 160 through 10 meters, Including the new 10, 18 and 24.5 MHz bands. Coverage you can live with for years and years, 3-Mode, 2-Range Offset Tuning. Offset the receiver section or the transmitter section or the entire transceiver In 2 ranges it500 Hz or + 4 kHz For complete flexibility in fine tuning, a DX work, or net operations. Seven Response Curves. Kour for SSB, three for...

Current Shunts For Dmivts

An inexpensive one-milliohm shunt extends the current measuring capability of digital multimeters to hundreds of Amperes. Each millivolt of voltage drop across the shunt means that one Ampere of current is flowing through the shunt. A DMM can thus read all the currents, both ac and dc, found m the home, laboratory, or shop when used with this shunt. In addition, the current in an automobile, including the Amperes to the starter motor and from the charging system, can be read by a DMM. The shunt...

Newshure D

Dual Impedance Normal Vox Slide Switch Adjustable Height Mfg. List 90.00 SAVE AT ONLY 49.95 Photo C Father Moran accepts the SOB (Sons of Boston) certificate from W1QMSI then kindly move off frequency to give the others a break. There is a mixture-phenomenon of long and short path openings, and now the fun begins. More US districts come in 8s and 9s and a few 6s plus HKs and YVs, The band is now wide open and the Siberians come in from the north (plus the woodpecker). Pandemonium breaks loose...

Radio Shack S Spacesaver Desk

Jf you've been looking for a compact, sturdy table for your radio gear, you know by now that most of the presentable alternatives require you to part with a substantial amount of hard-earned cash. Surprise Radio Shack has come to the rescue with a 49.95 table that is attractive enough to hold a place of honor in your living room. The Radio Shack Space-Saver Desk is designed for use with the TRS-80 computer system, but it makes an ideal operating position for a ham with a modest amount of radio...

Mfj

Another MFJ first ' these low cost mobile S V _ converters provide new excite-mem and variety tor viiur drivin listening pleasure. Two models to clnM> se from. The 4-band World Explorer (MFJ-304) offers com-p ete 19> 251 Sf ami 49 meter eoverayf Xhc most popular HF band due lo iheir distance capabilities ji vanous times ol the da> and yean. Hear countries n> m Europe. Africa, Middle East, Asia, the Islands. North and South America. The K-band ''World Explorer IT* (MFJ 308 adds 13, 16,41...

Incorporated

Box 494 Mississippi State, MS 39762 favorite products from the world s leading manufacturer of amateur radio accessories plent airwmng inductor for MFJ-945, 74+95, like model 941C hut less ore watts out. ant. switch. Optional mobile bracket for MFJ 484 Grandmaster Memory Keyer 24 hour, solid-state, blue 0,6 dibits, ID timer sounds every 9 min (also a snooze alarm), regular alarm for skeds ono awaken, powLT-oul tfiumi-on indicators, readv to use on MO VAC, 50-60H . 6x2x3. Up to twelve 25...

Swdc

Schematic of computing portion oi automatic vswr meter. quency, only duty cycle, this is of no importance Also, noti- the absence of a filter cap across the meter The square wave is at a fast enough frequency such that no meter jitter is observed, l he frequency of the 404 oscillator is approximately 300 kHz. The frequency of the square wave driving the meter will Vtiry from approximately 2000 Hz M a low forward-power reading to 175 Hz for i full-scale forward power reading. The exact...

Je Asciiencoded Keyboard Kit Announced By Jameco

Developed the JE610 ASCII-Encoded Keyboard Kit which can be interfaced into almost any computer system. The kit comes complete with a 62-key industrial grade keyboard switch assembly, integrated circuits- sockets, connector, electronic components and a double-sided printed circuit board. Complete, easy-to-follow step-by-step winng instructions and circuit diagram are also included The keyboard switches are SPST mechanical action and 60 keys generate the full 128 char acters. upper and lower...

Mirage S Model M

Mirage has announed the latest member in its line of quality amateur equipment, the B23 2-meter all-mode low-power amplifier, The B23 is designed to be used with alt available HT and low-power SSB transmitters. Mirage's newest amplifier will provide 30 Watts of output with 2 Watts of drive. The B23 is linear and may be keyed with as little as 100 mW and up to as much as 5 Watts. Five Watts input will give 40 to 45 Watts output, The B23 is packaged in a rugged, compact enclosure that may be...

Wideband Antenna Design

Tet Hb33sp

TET, THE LEADER ITi WIDEBAND ANTENNA DESIGN, introduces anotheF new triband anten na to provide unmatched wideband performance on the 10, 15 and 20 meter amateur bands. This radical departure from conventional triband antenna design employs TWO DRIVEN ELE MENTS with a rigid phasing line to couple power from the radiator element to the reflector. Phase relationships have been carefully engineered to provide extremely high gain figures without neglecting the need for high front to back ratio. The...

Priced At

For those no wish to moynl the encoder m a hand held umi he PC board measures only 9 lfl' i 3 41 rms pariial kn with PC board, cryslai. chip and components PRICED AT - - - ,, S14.9 5 ACtUmtft-MEMOCY orTKJN KIT THIS ACCUKEYER MEMORY KIT PROVIDES A SIMPLE LOW COST METHOD OF ADDING MEMORY CAPABILITY TO THE WB4VVP ACCUKEYER WHILE DESIGNED FOR DfRECT ATTACHMENT TO THE ABOVE ACCUKEYER IT CAN ALSO BE ATTACHED TO ANY STANDARD ACCUKEYER BOARD WITH LITTLE DIFFICULTY. I 6.9S AttUKlYtt KIT THIS ACCUKEYER...

Rldrake Company

Specifications, avattabihty ana prices subject to change trhout nor tee or obligation Our article on Dick Bash in the September issue elicited quite a response from our readers. Letters fell into three cate-gories those in favor of Bash, those againstt and those requesting his address. Considering reader requests for Mr. Bash's address as evidence of at least tacit approval of his activities, the mail ran approximately 2 to 1 in his favor. Below is a cross section of the many letters we...

Amateur Radio

The introduction of the WAYFARER by Yaesu is the beginning of a new era in compact solid state transceivers. The FT-707 WAYFARER offers you a full 100 watts output on 80-10 meters and operates SSB, CW, and AM modes. Don't let the small size fool you Though it is not much larger than a book, this is a full-featured transceiver which is ideally suited for your home station or as a traveling companion for mobile or portable operation. The receiver offers sensitivity of .25 uW 10 dBSN as well as a...