Simple.
Inductive coupling between the brake transformer in the rotor control
box (which is pretty large) and a transformer in the filter. It can also
be a ground loop, but most likely as above.
Thanks
73
Jim W7RY
On 2/8/2019 9:53 AM, Brad Anbro wrote:
Hello all,
I have a problem which has me completely baffled. I am attempting to use
a Bencher "XZ-2" audio filter, in conjunction with my early-model Yaesu
FT-1000MP. When I move my HF antennas with the control box that powers
a Tailtwister rotator, I get a very loud 60-Hz hum in my headphones. Even
when I only depress the brake release lever on the control box, it still
produces a hum.
So far, I have tried electrically isolating the grounds for both the rotator
control box and the Astron DC power supply, which supplies DC power to
the audio filter (and other devices). None of this has helped.
I have found that if I plug my headphones directly into the headphone jack
of the HF rig, there is no hum whatsoever. I am guessing that the 60 Hz
AC is coming into the audio filter through the DC power supply cord. If
this is actually the case, I don't know what to do about it to solve the
problem.
Any ideas or help with my problem would be most welcome. Thank you!
73,
Brad Anbro, N9EN
Bluff City, Tennessee
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