Zaon MRX causing radio interference 2

"qflyer1" wrote in message
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On Jul 23, 12:50 am, "Tim Ward" wrote:
"Itsaplane" wrote in message

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I'm starting a new thread on this topic as the old one sort of drifted
off-topic and its conclusions don't seem to reflect what I've found...

I have a Zaon MRX which is *using external ship's power* which is
causing radio interference. I know it's the Zaon because when the
radio goes to static, in flight, as if the squelch wasn't adjusted,
turning off the Zaon immediately stops the problem.

Following the recommendations of this forum, I've installed one, then
two, then three ferrite cores on the Zaon end of the power cord. Each
additional core has reduced the number of static problems I've had,
but not to zero (and not to where I don't have to frequently turn the
damned thing off!).

Calling Zaon tech support today (800-496-9430 x-311/312), they say
they have a particular problem with sailplanes -- something about our
radios being particulary sensitive because they're low power compared
to a larger, standard GA unit on a power plane.

As such, they don't have any real solutions for running with external
power. He did suggest either a) trying more ferrite cores on the
Zaon power lead (!), b) trying a ferrite core on the negative (?) side
of the radio's power lead, or for the sure fix c) running the Zaon off
its internal battery or a *separate* external battery other than the
one driving the radio.

Anybody have any other suggestions?

Eric

Has anyone tried a cap across the power leads right at the Zaon's case?
I don't know what the connectors are like, so I don't know how close you
can
go.
Inside the power connector would be ideal.
But a 25 volt or higher .01 uF in parallel with a .001 uF might help, and
shouldn't hurt anything at DC.

Tim Ward

Tim, are you recommending a polarized .01 and a ceramic .001?
I, too, have the dreaded ZAON issues.


Thanks,
Tim Larsen


Actually, I was thinking of a couple of ceramic surface mount chip caps
inside the power connector.
But having looked at the Zaon input power specs of 40 Vdc, I might go for 50
V caps.
However, since this is connected to wiring that doesn't have an alternator
to drive the voltage up and put spikes on it, you could make the case that
16 wvdc would be okay.

I don't own a Zaon, have never attempted this, attempt at your own risk,
etc.

But in theory, it shouldn't hurt anything.
Tim Ward