A while ago I stumbled across an Alpha 86 where two previous owners had
given up repairing the T/R board with the PIN diode problem.
I got the nice looking 86 including the dismantled parts from the T/R
board, at a very attractive price and concluded that even if I did not
manage to fix it, the 86 would still be a nice piece of equipment to put
on the shelf.
After just recently having had time with the good help of a friend to
modify the 86 T/R board to use vacuum relays and being very happy when
testing the amp and its performance, full output all bands and no
strange behavior, I discover that the audio on rx when in operate and
going on the air is heavily attenuated.
Trying to locate the problem I find that the Control board schematics
does not at all look similar to the actual layout on my board. The
Control board schematic (Figure 10 sheet 2 of 3) in my manual does not
match the actual board layout. The manual copy I have can be found here:
(http://www.alpharfsystems.com/wp-content/uploads/2016/05/Alpha_86_Operating_and_Technical_Manual.pdf
Now my hope is that there is an Amper out there that may have a
different version of the schematics that may correspond with the layout
of my version of the board. If so, maybe I can receive a copy ?
73
Harald, LB2HG ex LA6LHA
US callsign AA4NX
Visit my region: http://www.visitalesund-geiranger.com/en/
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