Date: Tue, 17 Sep 2002 00:40:22 +0000 (UTC) From: amesnopsamrak.demon.co.uk (Andrew Stephenson) Subject: Re: 2002 Saab 9-3 AM Radio Noise
In article <slrnaocl1a.mh4.agreenbunopsam.nyx.net> agreenbunopsamnet "andrewunix" writes: > 16 Sep 2002 14:50:09 -0700, helleraknopsamnet suggested: > : [static on AM stations, reduced when brake is applied] > > Hmm, I wonder if it's related to the brake lamp wiring. Could be. If the wiring is carrying static from the engine area back to the vicinity of the aerial, grounding it at the front by working the brake could explain the temporary end of the static. Keep in mind that, for signals like static, the +12V rail looks a lot like a ground, just as the 0V chassis does, so "grounding" of static can happen both by connecting to chassis and to +12V. OTOH, if there is static on the +12V, due possibly to a high-res battery and/or leads, you have another problem. And at the high frequencies involved in RF interference, cables stop being simple resistances; inductance and capacitance become important. Check for corrosion at all the connectors involved in the brake light feed and the light (and holder) itself. An ohm-meter may help. Relevant check: does the light come on as brightly as it should? -- Andrew Stephenson