---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 05/27/14: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:37 PM - Re: Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio) (Henador Titzoff) ________________________________ Message 1 _____________________________________ Time: 03:37:49 PM PST US From: Henador Titzoff Subject: Re: AeroElectric-List: 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 =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" =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 =========================0A =========================0A =========================0A >=0A>=0A>=0A>=0A>=0A> ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.