Description: This listing is for a schematic only of the radio you see pictured. All component values are included, but nothing else. There's no manual with step by step instructions. Once constructed, this item has exposed high voltage underneath the chassis. 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. This schematic is for 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. 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. 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. 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. For this circuit, 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. Shipping to United States zip codes only.
Price: 25 USD
Location: Grand Junction, Colorado
End Time: 2024-08-20T16:29:49.000Z
Shipping Cost: 0 USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 14 Days
Refund will be given as: Money Back
Brand: Unbranded
