Eli; This could be a nightmare! First you need to make sure that the grounds for the radios and the strobe and the engine are all good. Make sure the voltage regulator is isolated, too. Did the power wire have a "drain" (another bare wire) in it? If so, that's only grounded at the power supply, not the light. Check the grounds on the lights. Make sure the power wire is nowhere near any antenna wire, including the ELT. Check the grounds on the antenna. Replace your probably cheap antenna cables with RG400. Are you using a breaker or a fuse? This may sound funny but make sure the connections on your ammeter are good and clean. Even try to eliminate the ammeter to see if that makes it stop.
Remember that electricity is logical, no brain surgery involved. Good luck, document your findings and write a technical article for the future. Al DeMarzo Visit the Ercoupe Swap Page Free, Easy and No Membership Required http://www.ercoupeowners.com/swap/swapbook.htm ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Sent: Monday, January 14, 2008 8:50 AM Subject: [ercoupe-tech] Strobe noise Yesterday I completed replacing my power hungry (11 amp total draw) dual beacon with dual strobes (3.8 amp total draw). Now Ive got some intermittent noise in the COM, which is not continuous but happens AFTER the radio finishes receiving, for several seconds, and then dissapears. I tought that the automatic squelch was staying open and picking strobe noise, but that is not so, because I can turn the squelch totally off and most of the time the strobe noise is not there at all. Something is causing it to happen just after receiving every incoming transmission. I am not in a hurry to resolve this, since it is bearable and I really like having those strobes on all the time while transiting under the busy DFW Class B airspace. On my list of things to try are: 1. grounding the strobe power supplies directly to the battery, instead of to the plane chassis (recommended by Whelen) 2. Installing Lone Star Eliminator power line filters (which will not help if the noise is being picked through the antenna, instead of through the DC power line) Any other recommendations? Eliacim
