Today's Message Index:
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1. 07:48 AM - Side tone (Gordon Arbeitman)
2. 08:42 AM - Re: SL-60 for sale (swaneymj)
3. 09:34 AM - Re: Side tone (Doug McNutt)
4. 02:44 PM - Re: TeamGrumman-List: SL-60 for sale (teamgrumman@aol.com)
5. 02:48 PM - Re: Re: SL-60 for sale (teamgrumman@aol.com)
Message 1
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My recollection of the Sigtronics is that they just allow the audio from
a comm radio to be mixed in wiring with the intercom audio. No switching
is provided "because I sleep better that way". You should be able to use
the transmitter for a test with the intercom turned off. That way you
would be absolutely sure any sidetone is coming fro the transmitter. If
that doesn't work you should also be able to connect the mike to a
"standard" mike jack and the phones to a "standard" phone jack but you
might need a mike with a push-to-talk switch on it. You can make a PTT
by grounding the tip of the mike connector. That's the tip of "ring,
tip, and sleeve of the three terminal connector. The CP125 does not
generate any sidetone by itself. The Sigtronics drives the headphones
but, although it's quite the same, it's not called sidetone. The war
department's problem with distortion could well be the presence of audio
from the Sigtronics being mixed out of phase with sidetone from the
transmitter.
--
Thanks, that's helpful. Here are a few more questions:
When I talk to the Sigtronics (comm radio off), I hear myself
(sidetone). Is that coming from the Sigtronics ? If so, then I'm
guessing that both the intercom and the COMM radio are putting out a
sidetone, when I tranmit. If they are "out of phase", that would
explain the distortion. Is there a reason why I shouldn't disable the
radio's sidetone and just rely on the intercom sidetone? I almost
always fly with the intercom on.
Message 2
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| Subject: | Re: SL-60 for sale |
Garmin will give you $2000 off the list price to trade in a GX-60 on a 430/530W.
I assume that same would be true for an SL-60, too. I have a GX-60 and am
working this deal with Stark Avionics. The offer is good through 2009.
--------
Thanks,
Mark Swaney
F-1 Rocket #31, N76TR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=240095#240095
Message 3
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At 10:47 -0400 4/19/09, Gordon Arbeitman wrote:
>Thanks, that's helpful. Here are a few more questions:
>
>When I talk to the Sigtronics (comm radio off), I hear myself
>(sidetone). Is that coming from the Sigtronics ? If so, then I'm
>guessing that both the intercom and the COMM radio are putting out a
>sidetone, when I tranmit. If they are "out of phase", that would
>explain the distortion. Is there a reason why I shouldn't disable
>the radio's sidetone and just rely on the intercom sidetone? I
>almost always fly with the intercom on.
The intercom really ought to be turning off its output to the
headphones while a transmitter is keyed. It appears that it is not
doing that. Intercom audio is being sent to all headphones at the
same time. Strictly speaking, sidetone would be sent only to the
headset that has its microphone activated.
Are you , perhaps, keying the transmitter without telling the
intercom about it? A push to talk switch on a control yoke might be
doing that.
The sidetone from the transmitter is derived from a point very late
in the circuitry and is an indicator that the transmitter is working
pretty much properly. If you turn that off you would lose a failure
indication.
It's been almost two decades since I have had a Sigtronics apart and
I never owned one. I'll have a look at my records later today. There
might be a schematic around.
--
-> Stocks are getting pelloreid <-
Message 4
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| Subject: | Re: TeamGrumman-List: SL-60 for sale |
Thanks for the lead Gil. Russ, bought the SL-60
-----Original Message-----
From: Gil Alexander <gilalex@earthlink.net>
Sent: Sun, 19 Apr 2009 12:03 am
Subject: Re: TeamGrumman-List: SL-60 for sale
--> TeamGrumman-List message posted by: Gil Alexander
<gilalex@earthlink.net>
Gary, posted here...
http://www.vansairforce.com/community/showthread.php?p=319199#post319199
Let me know when it sells and I will mark it appropriately
gil A
>--> TeamGrumman-List message posted by: teamgrumman@aol.com
>
>Sure, thanks. That's awesome.
0D
Message 5
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| Subject: | Re: SL-60 for sale |
wish I had known
-----Original Message-----
From: swaneymj <swaneymj@mac.com>
Sent: Sun, 19 Apr 2009 8:40 am
Subject: Avionics-List: Re: SL-60 for sale
Garmin will give you $2000 off the list price to trade in a GX-60 on a
430/530W.
I assume that same would be true for an SL-60, too. I have a GX-60 and
am
working this deal with Stark Avionics. The offer is good through 2009.
--------
Thanks,
Mark Swaney
F-1 Rocket #31, N76TR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=240095#240095
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