Harold -
I don't recall a ferrite bead fix. Often this sort of problem is the
result of leaky T/R transistors (fuses!) Q306 & Q307 on the
Transmit/Exciter board allowing BOTH transmit and receive functions to
"sorta" work at the same time.
Check the 10R and 10T busses on the parent board. Each should read near
+10V when it should be "ON", and less than 0.1V when it should be off
"OFF".
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
hpolkscw wrote:
I have a TR-7, serial, 45XX, that breaks into oscillation on both
receive and transmit after some time warming up. However, it
sometimes howls from startup.
I remember reading some messages some time ago about a fix, which I
think was a ferrite bead on a component leg. However, I cannot find
this message after much searching, both on my computer and the archives.
Can anyone point me in the direction of the message or provide the
particulars of the modification.
Thanks
Harold
N3HP
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