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1. 03:37 PM - Re: Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio) (Henador Titzoff)
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| Subject: | Re: Trio Avionics ProPilot 130 Mhz interference problem |
(was noise problem on radio)
Glad to hear you solved your problem, Sacha.- So much for vendors meeting
standards like DO-160G.- This Trio product is designed incorrectly to me
et this standard, and their switching frequencies to move it away from 130.
00 MHz is only a band-aid.=0A=0AWe had a discussion earlier about how an op
en antenna cable could cause damage to a transmitter, and I explained how t
he 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 no
t all electronics are designed to DO-160 and if they are, sometimes enginee
rs make mistakes or the product is manufactured incorrectly.- As Bob said
, it's a very small probability but it can happen.=0A=0A-=0AHenador Titzo
ff=0A=0A=0A>________________________________=0A> From: Sacha <uuccio@gmail.
com>=0A>To: aeroelectric-list@matronics.com =0A>Sent: Tuesday, May 27, 2014
2:23 AM=0A>Subject: AeroElectric-List: Trio Avionics ProPilot 130 Mhz inte
rference problem (was noise problem on radio)=0A> =0A>=0A>--> AeroElectric-
List message posted by: "Sacha" <uuccio@gmail.com>=0A>=0A>Folks,=0A>=0A>I'm
reporting back on the solution to a problem which has been plaguing me=0A>
for over a year and which I've posted about a few times. Anytime my=0A>auto
pilot (a Trio Avionics ProPilot) is switched on, I would hear very loud=0A>
noise on the radio.- =0A>=0A>Yesterday I was down at the field trying to
gather some data about the noise=0A>I hear on the radio which I only hear w
hen my Autopilot is switched on.=0A>The first thing I confirmed was that th
e noise is also clearly audible (and=0A>so strong as to be unsquelchable) o
n my handheld radio, any time it is=0A>within a couple metres of the aircra
ft.- While I was tinkering around,=0A>almost by mistake, I switched freq
uencies on the radio (in Italy ultralights=0A>are only allowed to use the 1
30 Mhz frequency): silence!!!!- It turns out=0A>that the noise is only au
dible on 130.00 Mhz!!!!!=0A>=0A>In the evening I called the guys at Trio an
d they confirmed that they are=0A>aware of this interference problem.- Ch
uck at Trio told me that they have a=0A>10 Mhz oscillator in the box and th
at the 13th harmonic is what I was=0A>hearing on the radio.- The solution
involves substituting the oscillator=0A>with a 10.026 Mhz oscillator and T
rio will perform this operation in-house=0A>or ship you the necessary part.
- =0A>=0A>So much for the hundred man-hours spent checking all my avionic
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>=0A>=0A>=0A>=0A>=0A>
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