I hear you on the coffee!! = (Although I’m a Tea man myself).

That’s my suspicion – = that there is something on either the PTT ground run or on the Mic run. = However, remember it is only when the engine is running – and also remember = that in a Cozy that bad boy is 8 feet from the instrument panel. So, = since it’s only there when the mic is keyed it has to be something that gets = energized on the PTT ground wire or on Mic cable only when the engine is going. =

Unfortunately no oscilloscope = – wouldn’t know what to do with it if I had one! My usual = instruments for testing electrical things is a wet finger and a pair of ear plugs = – it hurts my ears when I find a live wire, hence the ear plugs. = J =

Joe Hull

Cozy Mk-IV #991 (Done Building! In Phase1 Flight Test - 0 hrs flown) =

Redmond (Seattle), Washington

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Joe Berki
Sent: Saturday, April 08, = 2006 4:57 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Radio Saga Beginning

Joe,

Disreguard the previous = message. I need coffee. Look at how the mike cable is grounded. You may = have a ground loop in that circuit. The shield should be grounded at one point. There might be noise on the ptt line also. Do you = have an oscilliscope?

Joe Berki

Limo EZ

----- Original Message ----- =

From: Bulent Aliev

To: Rotary motors in aircraft

Sent: = Saturday, April 08, 2006 1:20 AM

Subject: = [FlyRotary] Re: Radio Saga Beginning

Beats me Joe? I was also like a babe in the woods with my radio, until I = installed a new Icom and small and simple intercom. Now is perfect. RST is on my = desk ready for Ebay.

My fuel = pumps used to make lots of noise also?

Buly

On Apr 8, 2006, at 12:11 AM, Joe Hull = wrote:

Hey = Buly (and anyone else)

I’ve got = an RST intercom and an ICOM radio (don’t remember the number but only 1 = year old). When the engine is off I can hear and Xmit fine. Turn the = engine on and I can still hear fine (i.e. no noise) but when I key the mic there = is a ton of noise in my headset and in the broadcast. It’s not high pitched = just a mid-range noise.

I ruled out the alternator by taking the belt off – noise was still there.

So why noise only when I transmit? Any thoughts?

Joe Hull

Cozy Mk-IV #991 (Done Building! In Phase1 Flight Test - 0 hrs flown)

Redmond (Seattle), Washington