W8JI said:
>The last thing in the world anyone should do with an HF amplifier is
>use an RF sensing system to switch the thing!
>
>Timing problems are bad enough without waiting until RF appears
>to transfer the amplifier relay!
>
>I don't understand the problem the person described. The Drake
>has an internal supply for the relay. Why does it need external 12v?
If it's a common-ground problem, try flipping the
non-polarized (horrible design) relay plug over on the back of
the amp.
Not than anyone asked, but many L4-B's also do not have a
back-burp diode across the relay coil.
Hmmm.. Come to think of it, I haven't had my L4-B fired up
in a year or so. Probably time to charge up the caps.
73,
Jim, N7CXI
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