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Carrier Only Problem

 
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chasb(at)satx.rr.com
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PostPosted: Mon Feb 20, 2006 3:06 pm    Post subject: Carrier Only Problem Reply with quote

A friend is having radio problems with a new intercom/radio installation.

His bird is equipped with a intercom which appears to work as
advertised. Intercom between cockpits is okay. The mic break level is
easily adjustable using the intercom squelch, and the intercom volume is
adjustable. The comm radio receives very well on all channels. However,
the radio only sends a carrier - no voice, when attempting to transmit.
The carrier is strong and can be heard on a handheld over a half mile
away, but no hint of any voice.

We have eliminated the headset and the intercom, we think. We have
traced mic wires and all appear to be as they should be. The PTT circuit
is apparently working as a carrier is transmitted. Why no voice?

Any suggestions as to where to continue trouble shooting would be appreciated.

Charlie Brame
San Antonio


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wrmaxwell(at)bigpond.com
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PostPosted: Mon Feb 20, 2006 6:13 pm    Post subject: Carrier Only Problem Reply with quote

I would think the mic is not being switched from the intercom to the radio
mic input as the ptt is pushed - or at least that would be my diagnostic
starting point. If that is not the problem I would then suspect the radio
itself. what radio is it?

Bill
---


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rdunhamtn(at)hotmail.com
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PostPosted: Mon Feb 20, 2006 6:46 pm    Post subject: Carrier Only Problem Reply with quote

Charlie,

I had the same problem when I first installed my radio.

ICOM A200 VHF COM,
Sigtronics 400 series intercom,
Single (center stick) PTT.

I had crossed the co-pilot and pilot mic wires at the panel. Easy enough to
check. Talk into the co-pilot's mic and see if it modulates!

Hope this helps. Do not archive.

Rodney


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ceengland(at)bellsouth.ne
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PostPosted: Mon Feb 20, 2006 7:17 pm    Post subject: Carrier Only Problem Reply with quote

Charlie Brame wrote:

Quote:


A friend is having radio problems with a new intercom/radio installation.

His bird is equipped with a intercom which appears to work as
advertised. Intercom between cockpits is okay. The mic break level is
easily adjustable using the intercom squelch, and the intercom volume is
adjustable. The comm radio receives very well on all channels. However,
the radio only sends a carrier - no voice, when attempting to transmit.
The carrier is strong and can be heard on a handheld over a half mile
away, but no hint of any voice.

We have eliminated the headset and the intercom, we think. We have
traced mic wires and all appear to be as they should be. The PTT circuit
is apparently working as a carrier is transmitted. Why no voice?

Any suggestions as to where to continue trouble shooting would be appreciated.

Charlie Brame
San Antonio


Is your PTT line routed through the intercom, or direct to the radio? If
direct, the intercom might not be routing the mic signal out to the
radio. Check with the intercom mfgr to see if it requires the PTT line
to be routed through it to activate the xmit mic audio out line.

Did you install a backup mic/PTT jack direct to the radio? If so, you
can test from there to the radio with your mic plugged into this jack.
If not, can you get to the mic in terminal on the back of the radio? If
so, you can probe the terminal with a paper clip or something similar
while holding the PTT. As you probe repeatedly, you should hear clicks
on another radio on the same freq. This will let you know whether the
radio's audio section is working.

If all works so far, grab some clip leads & clip the intercom's mic
output line to the 'ring' of your headphone plug & clip the ground
terminal to the 'sleeve' of the plug. Hold the PTT down & talk in the
mic, listening to the headphone to see if you hear audio. This will tell
you if the intercom is passing audio in transmit mode.

If still no joy, ask us again.

Charlie


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deene(at)us.ibm.com
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PostPosted: Mon Feb 20, 2006 8:22 pm    Post subject: Carrier Only Problem Reply with quote

I would suspect that the mike audio out from the intercom to the radio
mike audio input is somehow not making it (broken/missed connection).
Checkout that path...

The mike key is making it since the Com side transmits, but looks like the
mike audio is not.

Deene

"Bill Maxwell" <wrmaxwell(at)bigpond.com>
Sent by: owner-aeroelectric-list-server(at)matronics.com
02/20/2006 08:07 PM
Please respond to
aeroelectric-list(at)matronics.com
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<aeroelectric-list(at)matronics.com>
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Subject
Re: Carrier Only Problem

<wrmaxwell(at)bigpond.com>

I would think the mic is not being switched from the intercom to the radio

mic input as the ptt is pushed - or at least that would be my diagnostic
starting point. If that is not the problem I would then suspect the radio

itself. what radio is it?

Bill
---


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brian



Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

PostPosted: Mon Feb 20, 2006 8:32 pm    Post subject: Carrier Only Problem Reply with quote

Charlie Brame wrote:

Quote:
We have eliminated the headset and the intercom, we think. We have
traced mic wires and all appear to be as they should be. The PTT circuit
is apparently working as a carrier is transmitted. Why no voice?

Check to see that the mic output level from the intercom to the comm
radio is set correctly. Some intercoms have a separate internal
adjustment to set the level of the signal going to the radio.

Secondly, check to see that the mic level in the radio is set properly.
Every transceiver with which I am familiar has a mic level control to
allow the shop to adjust to accommodate different microphones.

If you tell us which model of intercom and which model of comm radio you
have I might be able to be more specific.

--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
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mprather(at)spro.net
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PostPosted: Mon Feb 20, 2006 9:02 pm    Post subject: Carrier Only Problem Reply with quote

Does the system include an auxilliary radio input - to effectively bypass
the intercom - another set of jacks? If so, have you tried it? Have you
tried to turn off the intercom?
Regards,

Matt-

Quote:

<chasb(at)satx.rr.com>

A friend is having radio problems with a new intercom/radio
installation.

His bird is equipped with a intercom which appears to work as
advertised. Intercom between cockpits is okay. The mic break level is
easily adjustable using the intercom squelch, and the intercom volume is
adjustable. The comm radio receives very well on all channels. However,
the radio only sends a carrier - no voice, when attempting to transmit.
The carrier is strong and can be heard on a handheld over a half mile
away, but no hint of any voice.

We have eliminated the headset and the intercom, we think. We have
traced mic wires and all appear to be as they should be. The PTT circuit
is apparently working as a carrier is transmitted. Why no voice?

Any suggestions as to where to continue trouble shooting would be
appreciated.

Charlie Brame
San Antonio



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chasb(at)satx.rr.com
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PostPosted: Wed Feb 22, 2006 9:07 pm    Post subject: carrier only problem Reply with quote

Problem solved. Several guys responded, on the list and back channel.
Thanks for all the feed back. It helped with the trouble shooting.

The problem was with the mic audio line. A shielded wire was soldered to
ground and the soldering managed to short out the audio feed. We did a
proper soldering job and the set now works like it was supposed to.

Charlie Brame
San Antonio

------------------------------------------------

Quote:
Time: 03:06:19 PM PST US
From: Charlie Brame <chasb(at)satx.rr.com>
Subject: Carrier Only Problem



A friend is having radio problems with a new intercom/radio installation.

His bird is equipped with a intercom which appears to work as
advertised. Intercom between cockpits is okay. The mic break level is
easily adjustable using the intercom squelch, and the intercom volume is
adjustable. The comm radio receives very well on all channels. However,
the radio only sends a carrier - no voice, when attempting to transmit.
The carrier is strong and can be heard on a handheld over a half mile
away, but no hint of any voice.

We have eliminated the headset and the intercom, we think. We have
traced mic wires and all appear to be as they should be. The PTT circuit
is apparently working as a carrier is transmitted. Why no voice?

Any suggestions as to where to continue trouble shooting would be appreciated.

Charlie Brame
San Antonio



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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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