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f.miskelly(at)imperial.ac
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 Posted: Sat Jan 20, 2007 12:00 pm Post subject: Jack plug question |
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I have a King 155 in a Glastar - fibreglass panel
To hear other stations i have the radio turned up full and there's lots of radio interference. When i pull out the Jack plug the volume increases substantially (maybe 30%) and i have to turn down the volume. The radio interference is much less. When i push the jack plug back in the volume diminishes and the static noise reappears
Can someone explain this?
Many thanks
Frank
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f.miskelly(at)imperial.ac
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| Posted: Mon Jan 22, 2007 1:51 am Post subject: Jack plug question |
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Re-posting question more accurately
I have a King KX155 in a Glastar - composite aircraft with fibreglass panel
To hear other stations i have the radio turned up full and there's lots of radio interference. When i pull out the microphone jack plug (leaving the headphone jack in) the volume increases substantially (maybe 30%) and i have to turn down the volume. The radio interference is much less. When i push the microphone jack plug back in the volume diminishes and the static noise reappears
Can someone explain this?
Many thanks
Frank
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Mon Jan 22, 2007 6:13 am Post subject: Jack plug question |
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At 09:44 AM 1/22/2007 +0000, you wrote:
| Quote: | Re-posting question more accurately
I have a King KX155 in a Glastar - composite aircraft with fibreglass panel
To hear other stations i have the radio turned up full and there's lots of
radio interference. When i pull out the microphone jack plug (leaving the
headphone jack in) the volume increases substantially (maybe 30%) and i
have to turn down the volume. The radio interference is much less. When i
push the microphone jack plug back in the volume diminishes and the static
noise reappears
Can someone explain this?
|
I'm at a loss to deduce something I could purposely
do to create the problem you describe. Obviously, there
either a wiring problem or some form of failure in the
equipment . . . but I'd have to put my hands on it and
do some investigative experiments to sort this one out.
Has it always done this or is the condition new?
Bob . . .
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f.miskelly(at)imperial.ac
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| Posted: Mon Jan 22, 2007 7:12 am Post subject: Jack plug question |
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Thanks Bob.
The KX155 is 6 months old. This problem has been there from the beginning. It came with harness pre-wired and i installed it. Sometimes i use a handheld (ICOM A20) wired into the a/c power supply and aerial and there's some ignition noise but not a serious problem. Its just the panel mounted KX155. The microphone jack interferes with the volume (even with the squelch turned off) and introduces interference
Two possibles i thought of were
1. The microphone socket may need an earth? The panel is fibreglass and the socket has 2 wires running into it but is not earthed to the airframe
2. Could the wires in the microphone socket be transposed?
As the ICOM works OK that seems to exclude power supply or aerial issues?
Very grateful for your advice.
Frank
________________________________
From: owner-aeroelectric-list-server(at)matronics.com on behalf of Robert L. Nuckolls, III
Sent: Mon 22/01/2007 14:13
To: aeroelectric-list(at)matronics.com
Subject: Re: RE: Jack plug question
At 09:44 AM 1/22/2007 +0000, you wrote:
| Quote: | Re-posting question more accurately
I have a King KX155 in a Glastar - composite aircraft with fibreglass panel
To hear other stations i have the radio turned up full and there's lots of
radio interference. When i pull out the microphone jack plug (leaving the
headphone jack in) the volume increases substantially (maybe 30%) and i
have to turn down the volume. The radio interference is much less. When i
push the microphone jack plug back in the volume diminishes and the static
noise reappears
Can someone explain this?
|
I'm at a loss to deduce something I could purposely
do to create the problem you describe. Obviously, there
either a wiring problem or some form of failure in the
equipment . . . but I'd have to put my hands on it and
do some investigative experiments to sort this one out.
Has it always done this or is the condition new?
Bob . . .
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nuckollsr(at)cox.net
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| Posted: Tue Jan 23, 2007 9:41 pm Post subject: Jack plug question |
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At 03:10 PM 1/22/2007 +0000, you wrote:
| Quote: | Thanks Bob.
The KX155 is 6 months old. This problem has been there from the beginning.
It came with harness pre-wired and i installed it. Sometimes i use a
handheld (ICOM A20) wired into the a/c power supply and aerial and there's
some ignition noise but not a serious problem. Its just the panel mounted
KX155. The microphone jack interferes with the volume (even with the
squelch turned off) and introduces interference
Two possibles i thought of were
1. The microphone socket may need an earth? The panel is fibreglass and
the socket has 2 wires running into it but is not earthed to the airframe
2. Could the wires in the microphone socket be transposed?
As the ICOM works OK that seems to exclude power supply or aerial issues?
Very grateful for your advice.
Frank
|
If the push to talk circuit is active in your
microphone wiring, then the mic jack would need
two wires plus a ground. See:
http://aeroelectric.com/articles/micjack/micjack.html
If your mic jack is intended to handle ONLY
microphone audio and PTT is handled with other
wiring, then only two wires would be required.
Do you have a schematic of the pre-wired harness?
Have you checked your harness against the diagram?
Bob . . .
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f.miskelly(at)imperial.ac
Guest
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| Posted: Wed Jan 24, 2007 9:04 am Post subject: Jack plug question |
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________________________________
From: owner-aeroelectric-list-server(at)matronics.com on behalf of Robert L. Nuckolls, III
Sent: Wed 24/01/2007 05:40
To: aeroelectric-list(at)matronics.com
Subject: RE: RE: Jack plug question
At 03:10 PM 1/22/2007 +0000, you wrote:
| Quote: | Thanks Bob.
The KX155 is 6 months old. This problem has been there from the beginning.
It came with harness pre-wired and i installed it. Sometimes i use a
handheld (ICOM A20) wired into the a/c power supply and aerial and there's
some ignition noise but not a serious problem. Its just the panel mounted
KX155. The microphone jack interferes with the volume (even with the
squelch turned off) and introduces interference
Two possibles i thought of were
1. The microphone socket may need an earth? The panel is fibreglass and
the socket has 2 wires running into it but is not earthed to the airframe
2. Could the wires in the microphone socket be transposed?
As the ICOM works OK that seems to exclude power supply or aerial issues?
Very grateful for your advice.
Frank
|
If the push to talk circuit is active in your
microphone wiring, then the mic jack would need
two wires plus a ground. See:
http://aeroelectric.com/articles/micjack/micjack.html
If your mic jack is intended to handle ONLY
microphone audio and PTT is handled with other
wiring, then only two wires would be required.
Do you have a schematic of the pre-wired harness?
Have you checked your harness against the diagram?
Bob . . .
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f.miskelly(at)imperial.ac
Guest
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| Posted: Wed Jan 24, 2007 9:18 am Post subject: Jack plug question |
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Many thanks Bob.
The schematic in your link shows the harness linking the radio to the microphone jack is shielded. Not sure if mine is but will check.
I'm afraid i don't have a wiring diagram - they wouldn't give me one. Contacted the technician who did the wiring harness several times and he was vague about the need for a ground. Maybe he thought i had a metal panel or maybe he didn't understand the wiring and was just doing as he was told?
Think i'll install an earth on the microphone jack anyway. I presume it won't do any harm and may solve the problem. Also check the shielding
Thanks again
Frank
________________________________
From: owner-aeroelectric-list-server(at)matronics.com on behalf of Robert L. Nuckolls, III
Sent: Wed 24/01/2007 05:40
To: aeroelectric-list(at)matronics.com
Subject: RE: RE: Jack plug question
At 03:10 PM 1/22/2007 +0000, you wrote:
| Quote: | Thanks Bob.
The KX155 is 6 months old. This problem has been there from the beginning.
It came with harness pre-wired and i installed it. Sometimes i use a
handheld (ICOM A20) wired into the a/c power supply and aerial and there's
some ignition noise but not a serious problem. Its just the panel mounted
KX155. The microphone jack interferes with the volume (even with the
squelch turned off) and introduces interference
Two possibles i thought of were
1. The microphone socket may need an earth? The panel is fibreglass and
the socket has 2 wires running into it but is not earthed to the airframe
2. Could the wires in the microphone socket be transposed?
As the ICOM works OK that seems to exclude power supply or aerial issues?
Very grateful for your advice.
Frank
|
If the push to talk circuit is active in your
microphone wiring, then the mic jack would need
two wires plus a ground. See:
http://aeroelectric.com/articles/micjack/micjack.html
If your mic jack is intended to handle ONLY
microphone audio and PTT is handled with other
wiring, then only two wires would be required.
Do you have a schematic of the pre-wired harness?
Have you checked your harness against the diagram?
Bob . . .
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http://www.matronics.com/Navigator?AeroElectric-List |
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