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psm(at)att.net
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 Posted: Sun Nov 11, 2012 8:42 pm Post subject: Radio update***** interesting!!!! Icon A200 |
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-It sounds like the squeal is feedback from the speaker/headphones to
the microphone. Sidetone is the name of this sound in the
speaker/headphone. I suspect if you turn the sidetone down even more
the squeal will go away.
Paul
Camas, WA
On 11/11/2012 8:09 PM, SIDESLIP wrote:
| Quote: |
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 a!
djust 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 Nucholls (sp?)
Thanks in advance!!!
Chad Scriver
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C-GYXQ. 912ULS. 601XL-B
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Mon Nov 12, 2012 5:28 am Post subject: Re: Radio update***** interesting!!!! Icom A200 |
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Paul.... The only part that is confusing me though, is how could the mic possibly be picking up the sound from the headset? It squeals without even speaking. It makes more sense in my mind that it would be a mic gain issue more then anything. No?
Thanks again Paul!
Chad
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_________________
C-GYXQ. 912ULS. 601XL-B
Last edited by SIDESLIP on Mon Nov 12, 2012 9:46 am; edited 1 time in total |
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psm(at)att.net
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| Posted: Mon Nov 12, 2012 8:00 am Post subject: Radio update***** interesting!!!! Icon A200 |
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Chad,
It is all part of the same loop. MIke gain amplifies sound going into
the radio and sidetone talks about the volume coming out when the
transmitter is keyed. There is a similar volume control for the
intercom volume in both directions. If the amplification is too high
then you get squealing. It doesn't matter which side is too high.
However, if the mike is too low you won't send your information while if
the sidetone is too low you won't hear what you say. You need to find a
balance between these two settings that satisfies your communication
needs in both directions.
It wouldn't matter if you speak or not. There is some sound in the
system even when you are transmitting "Silence".'
You can try turning down either the mike gain or sidetone or both. If it
doesn't work you won't have lost anything except a little time. On your
intercom the name of sidetone changes to volume (maybe).
One side story. I had terrible sounds coming from my radio but only in
flight. I figured out it was the flow of air from my cabin vent hitting
the microphone and keying the intercom from the noise. I fixed it by
pointing the vent eyeball in a different direction.
Good luck,
Paul
On 11/12/2012 5:28 AM, SIDESLIP wrote:
| Quote: |
Paul.... The only part that is confusing me though, is how could the mic possibly be picking up the sound from the headset? It squeals without even speaking. It makes more sense in my mind that it would be a mic gain issue more then anything. No?
Thanks again Paul!
Chad
--------
C-GYXQ. 912ULS. 601XL-B
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387674#387674
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Mon Nov 12, 2012 9:43 am Post subject: Re: Radio update***** interesting!!!! Icon A200 |
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Makes sense.... I'll try more sidetone and the mic gain. Also going to try swapping antennas. The handheld works perfect and is wired in the same way as the A200, which tells me this is an A200 issue.
Chad
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
C-GYXQ. 912ULS. 601XL-B |
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