Re: UHF PA failure


Helmut Wabnig
 

On Fri, 18 Sep 2020 12:35:00 -0700, you wrote:

Does anyone know of a video on how to change the VHF/UHF Mosfet power amp ? Would like to review it before attempting.
Are you good in soldering?
Do you have the tools?
Without the tools it won't work.

There is nothing special. Remove the shield covers on top of the
transistor,
Remove the solder from the connections, but only where necessary.
The transistor comes off easily.

Need a strong solder tip, desoldering pump and desoldering braid,
and soldering flux.

It's SOLDER, not SODDER :-)


Actually an easy task. No special problems.
Re-solder with as little solder as possible.
HF does not like thick solder bumps.
Afte the solder work (not sodder) adjust the idle currents
as described in the service manual.

OE8UWW

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