Don,
In RX mode, relay K1 is not providing 12v to the TX power rail,
so transistors? Q911,Q912, Q92, Q93, Q96 and Q97 are not powered up.
I suggest you disconnect PA-PWR from your power supply so the IRF510 drains
are not getting power.? Then press PTT to put the rig in transmit mode
and measure those voltages for Evan.? That way the IRF510's won't be getting hot,?
and there is no need to put a dummy load on the antenna port.
Some parts of the driver amps might get warm if you hold down PTT too long,
I really don't know.
I'd let up on the PTT switch when not actually looking at the voltmeter.
Jerry
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On Thu, Dec 12, 2019 at 07:20 PM, Don - KM4UDX wrote:
Evan - for testing the transistors, do I have the board in normal RX mode?
