Re: Farhan's new PA for ubitx


Is there a best and final solution yet or are we still waiting for Allison's final comments on changes?

On 5/29/2018 9:45 PM, ajparent1/KB1GMX wrote:
those are .1 uf caps, pass rf block dc.  Says so in small print on the schematic.

That is the negativefeed back to keep the mosfets tame at low hf.  Without the cap its full
on forward bias likely will not hurt them but it will suck down many amps as under that
condition the mosfets look like s short to ground

Chaning R97/98 to 220 ohm is going the wrong way and not advised. 


Join to automatically receive all group messages.