On Jul 22, 1:32*pm, Eric Greenwell wrote:
Itsaplane wrote:

* 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.

1) Does the static problem go away when you use it's internal battery?
If it doesn't, your problem isn't the power lead and could be a radio
wiring problem, or maybe an MRX defect.

2) Have you tried another MRX to see if it has the same problem? Try to
borrow the newest one you can find, as the older ones did not have as
much "rf emission control".

3) Run a new power lead to the MRX directly from the battery terminals,
using shielded, twisted pair cable. Connect the shield to the negative
(-) terminal on the battery, along with the negative lead. Don't connect
the shield to anything at the MRX end. I believe this cable from Radio
Shack will work:

$9.89

50-Ft. Audio Cable - RadioShack.com
* * * * * * * * 50-Ft. Audio Cable
Model: CL2 UL Approved *| *Catalog #: 278-513

Do the simplest - but still safe - installation to test the idea. You
can do permanent installation it works, including fusing the lead at the
battery.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* "Transponders in Sailplanes"http://tinyurl.com/y739x4
* * * Sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" atwww.motorglider.org


I can confirm that the problem goes away when the Zaon is run on its
internal batteries (but I had to replace batteries twice in two 6+
hour flights). So the problem is with running the Zaon on external
power.

My next moves will be to follow suggetions I've received in this
discussion:

1) change the squelch setting on the radio (adustable if I pull out
this Dittel radio, I presume); if that doesn't work:
2) look for a non half-shell ferrite core; and if that doesn't work
3) replace the power cord with a shielded, twisted pair.

Oh, and is it fair to say that this is a KNOWN and WIDE-SPREAD
problem, at least for us poor glider pilot customers -- so it sure
would be nice if Zaon got its engineering team cracking on this
problem!

Eric