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Re: Spurs/Harmonics fixes for v4 based on v5 board design?

 

Evan,

It will work EXACTLY the same as SSB - why ? because the BiDi amp is still powered and amplifying
even in CW mode. giving birth to the Dancing dervishes and all..

Removing power during CW TX to Bidi amps might make a big difference.

Raj


At 03-02-19, you wrote:

Raj,

I would agree with this for the SSB setup, not sure how that would work with the CW setting.? Has a test been done to disable Q20 - Q22 to show that this is the case?? That statement also conflicts with what I am measuring in that the SSB harmonics with a single, dual, or multi-tone audio signal are lower than the CW signal.? I have also put a scope on TP12 and see a square wave coming from the si5351, which would support that there are potentially more harmonics at the input to the RF power stages for CW than coming from the SSB portion of the rig.
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