7AC, installed new FL-760 radio & bent whip anttena.

billusmc · Post by **billusmc** » Sun Feb 15, 2009 20:24

I just installed a Flight Line FL-760 in my 7AC.
It has a built in intercom and a PTT that I wired inside my stick.
I powered it with a lead acid sealed alarm battery that is under the front seat.
My anttena is a 45 deg. whip mounted on the bottom of my boot cowl. I use a 3x6 in. doubler on the cowl to stiffen the installation and add more surface area to ground the anttena.
Everything works great, except that I am hearing some mag. noise when the squelch is turned up. I have sheilded ingition and plugs.
I am hoping that I can get this signed off by my IA. He seems to think it will be OK.
Any suggestions on my mag. noise or radio approval?
BILLUSMC

Post by **joea** » Mon Feb 16, 2009 11:40

Bill,

First off, welcome on board!

Second, I would try to get the antenna futher away from the engine and mags. Your noise is usually coming from the magneto's, leads or spark plugs, and the futher away they are the better.

Most people put the antenna in the center of the top of the fuselage, the aluminum wing gap fairings or in the tailcone of the fuselage.

Joe A

Paul Agaliotis · Post by **Paul Agaliotis** » Mon Feb 16, 2009 12:16

Bill,
Some times the noise will be caused by unshielded wires to the mag switch.
Paul

Jimmy Payne · Post by **Jimmy Payne** » Mon Feb 16, 2009 20:49

Bill,

Check to see if it is on one mag or both. If you do have a shielded wire to the switch you may have to put a filter on the mag or mags.

From a former F4 USMC mech. What did you fly?