Hi,
Working on the "final" circuits for the homebrew!
Amp is a simple design, one tube only, (3CX3000A7), driven by a 32V-2.
Receiver is an R-390.
- PTT using a relay sequencing-timing circuit from Don K4KYV.
https://www.youtube.com/watch?v=ueeq4h888tc- Vacuum relay to switch antenna between TX/RX
Discovered that the lugs on the vacuum relay are made of something that I can't solder.
Considered using the TIG machine, but...
Anyway, resorted to the lathe and a microscopic tap & Bristol screws/wrench to fabricate the connectors.
Next will be the relay & related parts to provide the PA cutoff circuit as part of the PTT operation.
73
Frank
KJ4OLL