Hi Mark, for trouble shooting: use your hand held airband radio in the car. You don't even have to transmit. Dial in a frequency and reduce the squelch until you get the static / noise. Take the radio a short distance (1-2m) away and see if the noise still exists. There are a lot of cheap mobile device chargers out there. A cheap mobile charger or GPS power supply converter (example 12V to 5V) can create a lot of RF noise if it is poorly designed (skimped on caps..). Sometimes (sometimes!) it is possible to reduce the RF noise to acceptable levels by using Ferrite Cores on the power-out side of the charger (install ferrite core between charger and phone / gps) http://www.murata.com/products/emicon_fun/2012/07/emc_en13.html They are cheap enough to give them a trial. Here is an interesting read for all those "legal" cockpit add-ons because they are portable: http://pointsforpilots.blogspot.com.au/2013/06/radio-interference-of-12v-ipad-charger.html Erich
On Tue, Apr 8, 2014 at 9:32 AM, Mike Borgelt < [email protected]> wrote: > Mark, > > Are you running GPS or other computer type equipment also? > > Sounds like you are getting some RFI from other equipment in the car. > Could be coming in via the power lines to the radio or just radiating and > being picked up by the receiver. > > Mike > > > > > > At 08:33 AM 8/04/2014, you wrote: > > Content-Type: multipart/related; > boundary="----=_NextPart_000_0025_01CF5305.33C58BC0" > Content-Language: en-au > > > Hello All, > > As some of you know I work for the taxi company here in Benalla. > We are having issues with our VHF radio's. > Was just wondering if some of you with more knowledge than I could offer > some advice ? > > The problem we are have is with receiving transmissions, a lot of static > and a lot of times unreadable and yet transmission is fine. > The radios run at 150.2 mHz. These issues are only over a distance of 3-5 > km's. > We use to get 15 k +. > And have been getting worse over the last 6-12 months. > > Cheers > Mark Goodley > > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > *Borgelt Instruments* - > *design & manufacture of quality soaring instrumentation since 1978 * > www.borgeltinstruments.com > tel: 07 4635 5784 overseas: int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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