Description

This item has exposed high voltage underneath the chassis. I used good wiring practices, but if you are not experienced in working around lethal voltage, then PLEASE DO NOT purchase this item. Handled carelessly, this circuit can kill you!! Once powered on, the no load dc operating voltage produced by the 12 volt inverter power circuit is over 250 volts DC! The high voltage circuit works only in send mode. I make these radios from scratch, so please allow about 10 days for shipment, once purchased. This is a Homebrew QRP 80/40 meter ham radio transmitter/regen receiver, similar to the WWII Paraset, in that it employs two 6SK7's for the receiver and a single 12V6 tube for the CW transmitter. This radio was constructed on a 3D printed chassis. The 3D prints are never perfect, but as you can see, it's quite presentable, in overall appearance. You'll need batteries or a well filtered external power supply sources for this item. A 12 volt car, motor cycle, golf cart or wheelchair battery will work fine for the filaments and power inverter circuit. Four 9 volt rechargeable transistor radio batteries are required for the receiver. The 9 volt batteries have low current drain and will last for many hours, if not days, before needing recharged. No batteries or other power sources are provided with this listing. I do not ship batteries. Power output from the transmitter is about 5 to 7 watts, depending on crystal activity. The receiver frequency coverage is about 3.0 to 10.8 mhz, continuous. Two QRP crystals (one for each band) are included, along with a Piezo headset, like the red ones that you see pictured on some of my other listings. The headphone output impedance is high, in the ballpark of 2 to 4k ohms. QRP crystals can have a hint of chirp when pressed close to their operating limit, but typically I've been able to tune the tank circuit for a decent sounding cw tone. The full power FT-243 type crystals will sound better if you happen to have some of those on hand. Operating controls are PA and antenna tuning for the transmitter, plus main tuning, fine tuning, antenna coupling and regen action, for the receiver. There's an on/off switch on the regen pot, plus a send/receive switch on the upper left front panel, which fires the high voltage inverter, in send mode only. A hand-sketched schematic will be included with this item. You may purchase a schematic only, showing all parts values, on another listing. I guarantee this radio will work if hooked up properly to a respectable antenna system. Shipping to United States zip codes only.