@Axeman - Lance & @F4EXB - Edouard,
Just so we’re not chasing down wrong rabbit holes, I did a calculation of the capacitive reactance of MN7 that is shunted across the primary of the output transformer for TX1L (and TX2L). According to my calculations at 40m (7.0 MHz) here is the reactance of that 2 pF capacitor MN7:
XC = 1/(2piFC) = 1 / (2 x 3.141592653 x 7 MHz x 2 pF)
= 1.14E+04 ohms (to 3 significant digits)
= 11,368 ohms
At 3 MHz this value is about 27K, and at 30 MHz the value drops to 2.6K. At it’s design limit (1.9 GHz) the value drops to 41 Ohms.
So in view of that, I don’t think that the capacitance that’s there is going to cause any issues with the transmit channel and what’s there in inductance is just the transformer and it’s designed to function at least to 4 MHz without any difficulties. So there will be NO need to modify the transmit strip hardware for the Lowband Port. The Highband Port is unusable for HF (and who’d want it anyway?) since it is strictly operational from 2 GHz to 2.6 GHz.
So that matter is cleared from my mind - - Now it’s up to me to check this out on the spectrum analyzer this evening and see how it looks from 75m to 10m…Stay tuned…
73 de Marty, KN0CK