5 watt, 80 meter QRP CW Transceiver


Posted on Oct 31, 2012

1. Full 5 watt output using a power MOSFET final that is resistant to high SWR and thermal runaway. This final is very efficient and runs much cooler than traditional bipolar designs. 2. Highly sensitive and selective superhetrodyne receiver with plenty of audio to drive a speaker. About 100 Khz of tuning range is provided through a varactor diode along with a switchable RIT control. 3. Full break-in keying with a unique T/R switching system. Work is continuing on a printed circuit board and this circuit is expected to be available as a complete kit including all electronic parts, PCB and instruction manual at a future date. My prototype was built on Radio Shack universal boards.


5 watt, 80 meter QRP CW Transceiver
Click here to download the full size of the above Circuit.

This month, we`ll begin by building the VFO. The VFO uses a JFET for stability and a varactor diode to provide the necessary tuning. Many other JFET`s such as the 2N3819 or 2N4416 can be substituted for Q1 and Q2 but pay attention to the pinouts




Leave Comment

characters left:

good   May 13, 2008

vfo stabel

New Circuits

.

 


Popular Circuits

Automatic Charger with CD4541
Audio Mixer with 2N3819
50 Khz center frequency optical transmitter
The QRM900 Tesla coil
DIY USB password generator
HC132 Selling Leads
Automatic headlight dim switch
LMV1090 Dual Input Far Field Noise Suppression Microphone Amplifier
60W Guitar Amplifiers
2 line intercom plus a telephone changeover switch
100W ultra-CPI amplifier circuit



Top