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1. 11:24 PM - Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio) (Sacha)
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| Subject: | Trio Avionics ProPilot 130 Mhz interference problem |
(was noise problem on radio)
Folks,
I'm reporting back on the solution to a problem which has been plaguing me
for over a year and which I've posted about a few times. Anytime my
autopilot (a Trio Avionics ProPilot) is switched on, I would hear very loud
noise on the radio.
Yesterday I was down at the field trying to gather some data about the noise
I hear on the radio which I only hear when my Autopilot is switched on.
The first thing I confirmed was that the noise is also clearly audible (and
so strong as to be unsquelchable) on my handheld radio, any time it is
within a couple metres of the aircraft. While I was tinkering around,
almost by mistake, I switched frequencies on the radio (in Italy ultralights
are only allowed to use the 130 Mhz frequency): silence!!!! It turns out
that the noise is only audible on 130.00 Mhz!!!!!
In the evening I called the guys at Trio and they confirmed that they are
aware of this interference problem. Chuck at Trio told me that they have a
10 Mhz oscillator in the box and that the 13th harmonic is what I was
hearing on the radio. The solution involves substituting the oscillator
with a 10.026 Mhz oscillator and Trio will perform this operation in-house
or ship you the necessary part.
So much for the hundred man-hours spent checking all my avionics
interconnections, coaxial cables, etc!!
Sacha
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