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avidflyerss(at)ameritech.
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 Posted: Wed Jul 11, 2007 6:27 pm Post subject: Low transmit volume on Valcom 760 |
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Hello all, new subscriber here looking for some helpful advice.
I'm finishing up my instrument panel and did some radio testing
tonight. I have a Valcom 760 radio hooked up to a fiberglass rod type
antenna. I can receive great, in fact I was picking up traffic in the
pattern at an airport about 40 miles north of here with the airplane in
my garage. That said, I switched to a known unused channel and tried
some transmitting (listening on my handheld about 15 feet away) but the
volume was almost inaudible. I had to practically shout into my headset
mic in order to really hear and understand anything. I've checked some
of the basics with the wiring and don't see anything obvious.
Anyone have any tips on what to check or what the problem might be? I'm
afraid that everyone will be able to hear me key the mic, but will
struggle understanding me with this low output volume.
Regards,
Chad
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bobf(at)feldtman.com
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| Posted: Thu Jul 12, 2007 2:57 am Post subject: Low transmit volume on Valcom 760 |
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Might be okay - Automatic gain control (AGC) on handheld may have cut down the volume - try to talk to somebody a further distance away. check your SWR. probably okay
bobf
On 7/11/07, Chad <avidflyerss(at)ameritech.net (avidflyerss(at)ameritech.net)> wrote:[quote] --> AeroElectric-List message posted by: Chad <avidflyerss(at)ameritech.net (avidflyerss(at)ameritech.net)>
Hello all, new subscriber here looking for some helpful advice.
I'm finishing up my instrument panel and did some radio testing
tonight. I have a Valcom 760 radio hooked up to a fiberglass rod type
antenna. I can receive great, in fact I was picking up traffic in the
pattern at an airport about 40 miles north of here with the airplane in
my garage. That said, I switched to a known unused channel and tried
some transmitting (listening on my handheld about 15 feet away) but the
volume was almost inaudible. I had to practically shout into my headset
mic in order to really hear and understand anything. I've checked some
of the basics with the wiring and don't see anything obvious.
Anyone have any tips on what to check or what the problem might be? I'm
[b]
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avidflyerss(at)ameritech.
Guest
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| Posted: Thu Jul 12, 2007 3:41 pm Post subject: Low transmit volume on Valcom 760 |
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I don't have access to SWR but I went further away with the handheld
(couple hundred feet I guess) and it's the same thing. You can hear and
it's relatively clear, just really quiet.
chad
Subject: Re: Low transmit volume on Valcom 760
From: Robert Feldtman (bobf(at)feldtman.com)
Date: Thu Jul 12 - 3:57 AM
Might be okay - Automatic gain control (AGC) on handheld may have
cut down
the volume - try to talk to somebody a further distance away. check
your
SWR. probably okay
bobf
On 7/11/07, Chad <avidflyerss(at)ameritech.net> wrote:
>
>
>
> Hello all, new subscriber here looking for some helpful advice.
>
> I'm finishing up my instrument panel and did some radio testing
> tonight. I have a Valcom 760 radio hooked up to a fiberglass rod
type
> antenna. I can receive great, in fact I was picking up traffic
in the
> pattern at an airport about 40 miles north of here with the
airplane in
> my garage. That said, I switched to a known unused channel and tried
> some transmitting (listening on my handheld about 15 feet away)
but the
> volume was almost inaudible. I had to practically shout into my
headset
> mic in order to really hear and understand anything. I've
checked some
> of the basics with the wiring and don't see anything obvious.
>
> Anyone have any tips on what to check or what the problem might
be? I'm
> afraid that everyone will be able to hear me key the mic, but will
> struggle understanding me with this low output volume.
>
> Regards,
>
> Chad
>
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ceengland(at)bellsouth.ne
Guest
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| Posted: Fri Jul 13, 2007 11:33 am Post subject: Low transmit volume on Valcom 760 |
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Assuming that you've already tried a different headset to be sure it's
not the headset mic, check with VAL on whether there's a mic gain
control in the radio. (not the volume control on the front panel)
Some headsets with electret condenser mics have a gain control in the
mic itself. It would be a tiny recessed screw in the mic housing.
Charlie
Chad wrote:
| Quote: |
I don't have access to SWR but I went further away with the handheld
(couple hundred feet I guess) and it's the same thing. You can hear and
it's relatively clear, just really quiet.
chad
Subject: Re: Low transmit volume on Valcom 760
From: Robert Feldtman (bobf(at)feldtman.com)
Date: Thu Jul 12 - 3:57 AM
Might be okay - Automatic gain control (AGC) on handheld may have
cut down
the volume - try to talk to somebody a further distance away. check
your
SWR. probably okay
bobf
On 7/11/07, Chad <avidflyerss(at)ameritech.net> wrote:
>
>
>
> Hello all, new subscriber here looking for some helpful advice.
>
> I'm finishing up my instrument panel and did some radio testing
> tonight. I have a Valcom 760 radio hooked up to a fiberglass rod
type
> antenna. I can receive great, in fact I was picking up traffic in
the
> pattern at an airport about 40 miles north of here with the
airplane in
> my garage. That said, I switched to a known unused channel and tried
> some transmitting (listening on my handheld about 15 feet away)
but the
> volume was almost inaudible. I had to practically shout into my
headset
> mic in order to really hear and understand anything. I've checked
some
> of the basics with the wiring and don't see anything obvious.
>
> Anyone have any tips on what to check or what the problem might
be? I'm
> afraid that everyone will be able to hear me key the mic, but will
> struggle understanding me with this low output volume.
>
> Regards,
>
> Chad
>
|
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privatepilot03
Joined: 17 Jul 2007
Posts: 1
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| Posted: Tue Jul 17, 2007 8:54 am Post subject: Re: Low transmit volume on Valcom 760 |
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I couldn't sign up to the forums with my avidflyerss screen name for some reason, so I created this one.
Anyway, I tried adjusting the gains on both the radio and headset with little if any improvement.
At this point, I'm leaving everything as is until I get the plane done and actually try it at the airport and in the air. Maybe it's fine, I don't know, but it sure seems quiet to me.
Thanks
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