Re: 5W HF PA - setting bias current

Arv Evans

Setting the bias current with no load may be risky.  If there is any 
oscillation in the finals they could be destroyed.


On Tue, Jun 9, 2020 at 11:49 AM Martin <marting7mrv@...> wrote:
As I understand it, by adding a temporary link to load the DA shift register with 255, I can set the bias point by monitoring the supply current drawn, with no need for any RF drive.

Is this all there is to it? As theres no drive, do I take it that there is no requirement to terminate the output? Or, does the output require at least to 'see' a 50 ohm load?

I will be adding this amp into my 6-band U3S case,

Martin G7MRV

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