---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 05/26/14: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:24 PM - Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio) (Sacha) ________________________________ Message 1 _____________________________________ Time: 11:24:23 PM PST US From: "Sacha" Subject: AeroElectric-List: 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 ------------------------------------------------------------------------------------- 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.