Hi to David, Laurence, Alan, Jim & anyone else who helped.
The DDS vfo was only producing 50 mV at its output pin & coupled with the
very changeable output as I tuned accross its range I decided to have a
close look at the DDS chip itself on the pcb, I used a second magnifying
glass under the illuminated magnifying bench lamp & I did not see any visual
problems with the way the chip was mounted & soldered.
So I got out the very fine tipped soldering iron & some very fine solder &
carefully went round the chip again. Powered up & BINGO it worked ok.
I am now seeing 200 mV or so from the DDS chip & 1.1V p-p output into 50R
load. Back to the shack & connected to the G0MRF Tx & what a wonderful sight
to see full output from the PA.
Thanks for all your help & advice chaps.
73
Gary - G4WGT.
|
