Re: UBITX V3 TX GAIN VARIATIONS

Kees T
 

On Thu, Aug 30, 2018 at 09:42 PM, ajparent1/KB1GMX wrote:
The cap does not need to be a 500V part even at 28V as the mosfets will self destruct
at 100V, so a 100V cap is fine so long as it can handle high RF current.
I've found that the 500V caps are more "robust" from a current handling and stability standpoint...and those are 500V DCWV. At RF (AC) they are all derated. I use a "rule of thumb" (which is easy for me to remember) ....50%.  That also means you have to consider the RF voltage rating of the blocking capacitors in the feedback loops. If they fail the associated MOSFET is toast.

73 Kees K5BCQ 

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