Steve Kavanagh wrote:
As far as I can see from the manual, the KPA100 T-R
switch is bypassed in QRP mode.

No, that is incorrect. If the KPA100 is installed, the t/r switch is active. Note that the bias oscillator (what I fondly refer to as the 'birdie generator') is fed from the 12CTL line in the ribbon cable.

If you really want to test this, replace the KPA100 with the low-power lid and see what happens.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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