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Re: Overhauling my first and second U3s. PA bias and power output with (3) BS170 transistors question(s)


 

Answering my own question. Set the bias per the manual. The high setting for PA voltage is a little over 7V. I could go higher but it's a weak signal beacon not VOA.

The OCXO wasn't drifting because it wasn't set right. It was drifting because it wasn't working. I must've toasted the heaters when I tried to adjust it. I'll just take the screws off the lid and replace the transistors <--- OCXO owners inside joke...

73
NE5U

Mike

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