Without digging into it deeper, unplug the pa from the driver board and see if
the 2 watts you're seeing is the driver and not the PA. You need to reroute the
driver to the filter board or terminate it with a 50 ohm load and measure power
across the load
mike, wb8vge
On Feb 10, 2012, at 5:51 PM, Scott Sheppard wrote:
> Well, I picked up a real lemon on ebay that I am trying to bring back to
> life...at the moment my focus is on teh power output--or lack of it. I manage
> about 2 watts or less on all bands and never more than 3.5 amps draw even
> with drive full on...so the low level driver is doing its thing anyway. When
> I checked at the PA terminals (the feed thru posts to the PA) the voltages
> all checked within range so its 'inside the PA...I took it off the rig and
> had a look in the hopes something obvious would present itself but no luck.
>
> My question is, howw do I go about checking the PA now...can I test the
> transistors in circuit? I am hoping it is the 2nd stage of amplification and
> not the actual finals themselves as 2 watts is surely just the low level
> driver so perhaps its the MRF 476's?
>
> 73
>
> scott VA3IED
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