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As you speed up the engine, another thing that happens is that the generator starts charging. There is also a relay in the regulator that vibrates rapidly as the voltage gets high enough to pull it in. When it pulls in, it reduces the excitation to the field. This cycle can repeat itself in the thousands of times per second. One way of testing for this type of radio noise is to temporarily connect the radio to an independant power source. Typically this is an extra battery on the floor. If the noise stops, it shows the power input to the radio is the entry point. If it does not stop, it usually indicates the antenna is the entry point. There is usually a capacitor on the field line going into the generator to filter the above described noise. Dick in NM. ----- Original Message ----- From: "Hartmut" <[EMAIL PROTECTED]> To: "Bob Belbeck" <[EMAIL PROTECTED]> Cc: "Darwin Girdauckis" <[EMAIL PROTECTED]>; <[email protected]>; "tech" <[email protected]> Sent: Thursday, June 20, 2002 4:44 PM Subject: Re: [COUPERS-TECH] Re: [COUPERS-FLYIN] Comm noise! > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Hhhm. So you are not blocking the cause of the noise, just filtering the > power lines to the radio? > > Well, if it works.. > > Hartmut > > Bob Belbeck wrote: > > > > You know, my really old Cessna (god forbid!) had the same problem. I greatly > > reduced it by picking up a couple of those in line filter things - The kind > > you wrap your power line around a few times, with no electrical hookup. > > Worked pretty good. Don't think it would count as an illegal repair. Now, > > the filter I built into the power for the cigarette lighter that powered my > > handheld and gps probably wasn't faa approved, but it worked really, really > > good.... > > ----- Original Message ----- > > From: "Hartmut" <[EMAIL PROTECTED]> > > To: "Darwin Girdauckis" <[EMAIL PROTECTED]> > > Cc: <[email protected]>; "tech" <[email protected]> > > Sent: Thursday, June 20, 2002 2:12 PM > > Subject: [COUPERS-TECH] Re: [COUPERS-FLYIN] Comm noise! > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > > advice in this forum.]---- > > > > > > > > > Darwin. > > > You are not alone having radio noise coming from the ignition system. > > > Question is , what are you going to do about it?? > > > > > > Hartmut > > > > > > Darwin Girdauckis wrote: > > > > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following > > any advice in this forum.]---- > > > > > > > > Hi guys > > > > I got my new continental engine overhaul manual today! > > > > From what it says , the mags I have, eisemann LA-4's , do suppress > > > > radio noise. The wires are in poor condition as they have cracks in the > > > > insulation.. > > > > The top plugs have steel cups that screw over top of them. These cups > > > > have caps that > > > > screw onto the tops of them & the plug wire goes through the side.Still > > > > haven't had > > > > a chance to try it again to see if there is any difference from one mag > > > > to the other, but > > > > I do know that there is no noise at an idle. The sound starts as I speed > > > > up the engine. > > > > ei more load. > > > > Darwin > > > > > > > > ================================================================== > > > > TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm > > > > > > ================================================================== > > > TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm > > > > > > > > > > > > > > ================================================================== > TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm > > > ================================================================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm
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