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uuccio(at)gmail.com
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 Posted: Mon May 26, 2014 10:24 pm Post subject: Trio Avionics ProPilot 130 Mhz interference problem (was noi |
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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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henador_titzoff(at)yahoo.
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| Posted: Tue May 27, 2014 2:37 pm Post subject: Trio Avionics ProPilot 130 Mhz interference problem (was noi |
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Glad to hear you solved your problem, Sacha. So much for vendors meeting standards like DO-160G. This Trio product is designed incorrectly to meet this standard, and their switching frequencies to move it away from 130.00 MHz is only a band-aid.
We had a discussion earlier about how an open antenna cable could cause damage to a transmitter, and I explained how the wave's voltage can double as it bounces back to the transmitter. Bob said that today's avionics are protected against such damage. I claim not all electronics are designed to DO-160 and if they are, sometimes engineers make mistakes or the product is manufactured incorrectly. As Bob said, it's a very small probability but it can happen.
Henador Titzoff
[quote] From: Sacha <uuccio(at)gmail.com>
To: aeroelectric-list(at)matronics.com
Sent: Tuesday, May 27, 2014 2:23 AM
Subject: Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio)
--> AeroElectric-List message posted by: "Sacha" <uuccio(at)gmail.com (uuccio(at)gmail.com)>
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
[quote][b]
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