jeremy-ca wrote:
The input coil is common to all bands in the 75A1, the secondary is
then fed to the band switch.
Check the antenna coil primary first and then the secondary for
continuity. Rewinding shouldnt be that hard if the form hasnt been
destroyed. The hardest part will be removing it from the assembly.
A couple of decades ago, I accidently dumped a few hundred watts of RF
directly into the front-end of an SX-73, on 75m. The input coil took
the brunt of the damage.
John Mohn/W5MEU(sk) told me to come out there and get some 24ga copper
wire to re-wind that coil. Very carefully, I removed the phoenelic
board from the turret in which the coil was installed, then ever
so-much-more carefully, removed the coil from the board. There was a
spot on the coil that -wasn't- burnt, so I was able to count turns, and
re-wind the coil. Luckily, I was working at Southwest Research
Institute at the time, and was able to utilize a small-wattage iron,
some organic stripper and a magnifying glass to re-solder the connections.
--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KYV)
--
73 = Best Regards,
-Geoff/W5OMR
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