• If You Are Having Trouble Logging In with Your Old Username and Password, Please use this Forgot Your Password link to get re-established.
  • Hey! Be sure to login or register!

Magneto filter

bob turner

Registered User
Buddy says he is experiencing intercom noise. He says it goes away below 2200 rpm.

Radio is the Garmin GTR-200, a unit highly susceptible to RF noise. We are running ten of these radios and put up with interference from ground emitters and approach control bleed-through, but he says he gets it all the time, and he is sure it is intercom noise. The intercom can be turned off, of course.

Engine is a factory new O-360 in a Super Cub with Slicks. The engine has 1000 TT, and the mags were redone 300 hours ago.

So - assuming the mag filters have died, he wants me to buy new ones and install. Before we do that I will ride with him and try each mag individually.

But the question: are the $95 filters as good as the $300 filters? Spruce sells both.

My impression is that Slicks don’t even need filters. Am I wrong?
 
Slicks shouldn't need filters. One thing to check is that the radio installation was done using RG-400 coax for the radio. I installed a GTR-200 in my RV. It was so noisy it was unusable with RG-58 coax. Then I backtracked and reread the manual. RG-400 is a requirement for almost any Garmin radio installation. I replaced the coax with RG-400. All the RF interference is gone and the radio is now one of the best I've ever owned for both broadcast and receive range as well as clarity.
 
Thanks. Turns out the front headset was going bad, and they had messed with the intercom parameters. Gave them a new DC10-13.4 and I think we solved the problem.

I always shield and insulate jacks, and have gone to RG-400, but some airplanes still have the RG-58, and we are not having any trouble with them.

The -200 needs a bit more RF squelch range. If they had used the SL-40 receiver it indeed would be the best aircraft radio ever produced.
 
Back
Top