Introducing the "PIXIE" micro-power amplitude telegraph transceiver—a small yet powerful kit that packs a punch! Despite its compact size and the limitations of a DC receiver, this 40-meter band transceiver can work over several hundred miles when connected to a good antenna.

S-Pixie CW QRP Ham Amateur Shortwave Radio Transceiver 7.030 Mhz with Transparent Acrylic Shell Fully Assembled. This Pixie, assembled and ready to transmit, boasts a unique feature—it will be sent with a 7.030 crystal.

The rig is W7EL's Optimized QRP transceiver, from August 1980 QST, designed by Roy Lewallen. The rcvr sounds great, the xmtr has clean keying, and the output is 1.5 watts. The VFO is stable and tunes from 7 to 7.140. The QSK is absolutely perfect - the best I've ever heard! Roy did a marvelous job designing this rig.

QRP-40 • 1 40 METER (7MHz) CW TRANSMITTER Ramsey Electronics Model No. QRP40 THE RAMSEY QRP-40 IS AN AMAZING PERFORMER THAT WILL WORK THE WORLD ON ABOUT A WATT! FOLKS OF ALL AGES HAVE SUCCESSFULLY BUILT AND ENJOYED THIS EASY, FUN KIT. • Ideal for portable or travel fun • VCXO design …

Power Requirements: 2.1 x 5.5mm coaxial plug, center positive. Receive: 10 to 16 VDC; reverse-polarity protection 15 to 20 mA. Transmit: 400 mA - 500 mA at 3.0 watts output. VFO frequency: 2.085 MHz nominal. Tuning Range: Any 40 to 45 kHz segment of the 40m CW band (7.0-7.15MHz) Drift: 100Hz total from cold start at 65°F.

ハムフェア2015自作品コンテスト 規定部門のテーマが『7MHz AM送信機』と発表されたとき、四十数年前に真空管 (6AR5)で7MHz AM送信機を自作して開局したことを思い出しました。 このテーマなら自分にも出来るかもしれないと思い、正月から構想を練り始めました。 ありきたりのAM送信機ではつまらないので、SBM (Single Balanced Modulator)方式の低電力変調を試してみることにしました。 【図-1】 試作したSBM変調送信部基板. 励振段までは成功して、かなり …

NS-40+ 5W 7MHz QRP CW Transmitter - $25 This classic kit had been offered by the Four State QRP group for many years, and finally retired. Now it is back, and better than ever!

An Optimized QRP Transceiver for 7 MHz Here is a rig that provides real challenge for the QRP home builder. Nonetheless, this is a classic circuit and a favorite in the QRP community. Even though this project (designed and built by Roy Lewallen, W7EL) was first published in August 1980 QST, it is still the best available portable

For a trip to the USA in June 1997 I have developed this little 40 meters transceiver. The receiver is a direct conversion receiver with a very good audio filtering. It is a real pleasure to listen to CW-signals, strong or week. (For SSB the filters are simply to narrow.)

2007年1月2日 · The circuit of a 7MHz C W / A M QRP transmitter described here can be used to transmit either CW or audio frequency modulated signal over a 7MHz carrier. The carrier frequency oscillator is crystal controlled using 7MHz crystal in its fundamental mode.