SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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 Posted: Sun Nov 11, 2012 8:09 pm Post subject: URGENT!!! Radio update***** interesting!!!! Icom A200/FCmc |
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So, fellas,
I figured I'd start a new thread about this, since I have narrowed the issue down.
So, the A200 was bench tested, and tested out fine. The only item that seemed out of whack, was the side tone, which was set VERY high. I cleaned the terminals on the back of the radio prior to install. I tightened the radio into its tray firmly, and proceeded to test. The squeal seemed to be gone on 129.10, both with engine running, and without. This problem I BELIEVE is definitely a squelch problem. I transmitted the squeal, and while mid transmit, unplugged the mic cord. The squeal stopped immediately. Then I tried messing with different volume/squelch settings on the flightcom. To no avail, squeal still present....
Here is where it gets weird.... I pulled the mic away from my face, NO MORE SQUEAL! Well, very very little, and when I tapped the mic, it tried to come back, but then faded. So, I figured, let's try the tower. I turned my head looking over my right shoulder, and ZERO squeal. When I am facing straight ahead, and get it to squeal, while it is mid squeal, I cover the mic with my hand, and it deadens it considerably!
IF this was wiring, here is how I disprove that theory....
The handheld transmits and receives PERFECTLY and gives 5/5 no matter what! Worked seamless. Flip back to the A200, and squeal! Keep in mind, the handheld is wired into the flightcom as well, and shares all of the same wiring as the A200! So, the final question........ Could this be as simple as the mic gain on the 200? With the engine running, there is zero interference from the engine. On BOTH radios. I think that this proves that the grounds are good, wiring is good and the flightcom is good. I still get the strobe POP when they fire, but I get that SAME pop in the Cessna 172M I fly! So, that is an acceptable noise for me. And since a certified very high dollar factory built airplane has strobe noise, I'm not too concerned about this one. It really is quiet. So...... MIC GAIN, OR NOT TO MIC GAIN ADJUST? Or try changing antennas? Thoughts? After changing the side tone, it is MUCH better. Still not acceptable, but it DID get better. I've read a lot of people suggesting to adjust the mic gains, with great results for them, yet others say it won't do a thing. It is DEFINITELY feedback like you'd hear from an amplifier too close to an electric guitar.
I feel that I'm right on the edge of solving this problem.....I'm thinking, that if I can change antennas and that resolves it, it may be as simple as a faulty antenna, or maybe even not the right one?
It's would be great to hear some feedback from the pro Bob Nuckolls.
Thanks in advance!!!
Chad Scriver 
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