This strongly suggests that Buddy's station lacked proper bonding. That
coax should, for example, have been bonded to all other coaxes at the
entry point to his station, from there to a robust system of ground
rods, all bonded to power, CATV, telco, and all other grounds in his
home. Every chassis in his station should have been bonded together and
to that combination of grounds. If that had been done, it seems unlikely
that a bunch of beads on the power amp output would have solved a
problem (or that the problem would have even existed).
73, Jim K9YC
On 4/17/2020 9:37 AM, Jim Thomson wrote:
there is merit to installing an additional CM choke right at the
output of a linear amp. Buddy had severe rfi on his 80m yagi, dsl
issues, you name it.
No amount of filtering on those devices worked. RF into the audio on
6M setup. M2 has no clue how to design a balun for a 80m yagi...nor
a 6M yagi.
In desperation, buddy installed 30 inches worth of type 43 beads, onto
213-u....right at the output of both the HF amp..and also the 6m
monoband amp.
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