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transmitter component detail and photos
* Updated 12-20-07 TR Keying Schematics
Early in 2006 I decided to build my first homebrew transmitter. It would be based on the 80m/160m Class E AM transmitter design created by Steve Cloutier WA1QIX, as described on his website, www.classeradio.com
This transmitter is a 80/160 meter dual-bander capable of 350 watts carrier. There are 10 MOSFETs in the rf amplifier final, including 2 modules using 5 MOSFETS each. The modulator/power supply uses 2 MOSFETs in the pulse width modulator output. The 80/160 meter VFO is also homebrewed, and provides digital outputs to the rf deck drivers.
The transmitter output is monitored by an REA AMM-HF1 modulation monitor, and the current audio chain includes a Heil PR-40 microphone and Symetrix 528E voice processor.
As you can see in the picture, I have not yet put the transmitter in its permanent aluminum 19” enclosures. The bread board construction helped me get the transmitter together more quickly, and made changes easier. This was a good thing for a first-time builder! I am anxious though to move them into the permanent boxes, both for the appearance and the shielding. A nice 19” rack will replace the temporary shelving.