---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 05/02/14: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:09 AM - Radio interference on pitch trim indicator (Phil B) 2. 04:32 AM - Re: Radio interference on pitch trim indicator (Bob Harrison) 3. 06:11 AM - Re: Radio interference on pitch trim indicator (Mike Gamble) ________________________________ Message 1 _____________________________________ Time: 04:09:52 AM PST US Subject: Europa-List: Radio interference on pitch trim indicator From: "Phil B" When transmitting, the pitch trim indicator display is affected and I get a crackle in the headphones. To try and resolve the problem I have run a temporary aerial forward through the firewall and around the outside the fuselage about 1m offset, onto the dipole aerial from the rear of the rudder so that it is clear of the pitch trim at the rear of the fuselage and connected the radio to its own power source all to no avail. Ive read previous posts on this forum re the pitch trim interference and assume it will not cause any problems. How can I reduce the crackle while transmitting as it is fairly loud and cannot be reduced by altering the squelch setting? Ive cleaned all the earth connections and can only assume the crackle is being somehow induced via the pitch trim wiring which I have separated as far as possible from the antenna and the wiring to the radio. All suggestions appreciated. Thanks, -------- Phil B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422721#422721 ________________________________ Message 2 _____________________________________ Time: 04:32:49 AM PST US From: "Bob Harrison" Subject: RE: Europa-List: Radio interference on pitch trim indicator Hi! Phil, I'm no electronics or radio guru but there is no doubt some relationship to the radio transmit circuit since the LED trim display certainly flickers when transmitting even though there is no duplicated connections with the two circuits but thankfully I don't get noise. Regards Bob Harrison G-PTAG -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Phil B Sent: 02 May 2014 12:09 Subject: Europa-List: Radio interference on pitch trim indicator When transmitting, the pitch trim indicator display is affected and I get a crackle in the headphones. To try and resolve the problem I have run a temporary aerial forward through the firewall and around the outside the fuselage about 1m offset, onto the dipole aerial from the rear of the rudder so that it is clear of the pitch trim at the rear of the fuselage and connected the radio to its own power source all to no avail. Ive read previous posts on this forum re the pitch trim interference and assume it will not cause any problems. How can I reduce the crackle while transmitting as it is fairly loud and cannot be reduced by altering the squelch setting? Ive cleaned all the earth connections and can only assume the crackle is being somehow induced via the pitch trim wiring which I have separated as far as possible from the antenna and the wiring to the radio. All suggestions appreciated. Thanks, -------- Phil B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422721#422721 ________________________________ Message 3 _____________________________________ Time: 06:11:23 AM PST US From: "Mike Gamble" Subject: RE: Europa-List: Radio interference on pitch trim indicator Me too - trim gauge flickers with transmit but no associated noise. Suspect degree of interference varies with frequency selected but I'm not able to check right now. Mike Gamble G-CFMP -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Bob Harrison Sent: 02 May 2014 12:32 Subject: RE: Europa-List: Radio interference on pitch trim indicator --> Hi! Phil, I'm no electronics or radio guru but there is no doubt some relationship to the radio transmit circuit since the LED trim display certainly flickers when transmitting even though there is no duplicated connections with the two circuits but thankfully I don't get noise. Regards Bob Harrison G-PTAG -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Phil B Sent: 02 May 2014 12:09 Subject: Europa-List: Radio interference on pitch trim indicator When transmitting, the pitch trim indicator display is affected and I get a crackle in the headphones. To try and resolve the problem I have run a temporary aerial forward through the firewall and around the outside the fuselage about 1m offset, onto the dipole aerial from the rear of the rudder so that it is clear of the pitch trim at the rear of the fuselage and connected the radio to its own power source all to no avail. Ive read previous posts on this forum re the pitch trim interference and assume it will not cause any problems. How can I reduce the crackle while transmitting as it is fairly loud and cannot be reduced by altering the squelch setting? Ive cleaned all the earth connections and can only assume the crackle is being somehow induced via the pitch trim wiring which I have separated as far as possible from the antenna and the wiring to the radio. All suggestions appreciated. Thanks, -------- Phil B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422721#422721 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.