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nuckollsr(at)cox.net
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 Posted: Thu Aug 31, 2006 4:23 am Post subject: Paralleled microphone circuits? |
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| Quote: | Hi Bob,
I am a homebuilder (Midget Mustang, very small single seat) now doing the
wiring. My radio stack will contain one comm/nav radio and I plan to
include a small handheld mounted elsewhere in the cockpit. If needed due
to a failure of the #1 radio, it will interface to my headphones via your
isolation amplifier.
My question is, "Can I connect my mike to both radios concurrently. I will
have seperate PTT switches, so only one radio will transmit. I am not sure
if the 2nd radio will load the mike too much, or will there be some other
gotcha out there?
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Connecting the mic circuits as you've suggested
offers an unknown probability of success . . .
I would guess not a good one.
A transmitter selector switch is suggested. See:
Figure 18-11 of:
http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf
| Quote: | I use your website lots. Thanks for all your work in that area.
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You're most welcome sir!
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
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FLYaDIVE(at)aol.com
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| Posted: Thu Aug 31, 2006 6:58 am Post subject: Paralleled microphone circuits? |
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| Quote: | My question is, "Can I connect my mike to both radios concurrently. I will
have seperate PTT switches, so only one radio will transmit. I am not sure
if the 2nd radio will load the mike too much, or will there be some other
gotcha out there?
==========================================
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It depends on HOW you hook up the PTT switch.
You do NOT want the MIC to be HOT in a parallel radio circuit. That would
change the MIC matching impedance of both radios.
But, if you switch in and out the MIC lines using a PTT switch that would
work.
In most cases the PTT switch ONLY keys ON the radio and does not switch in
and out the MIC. You may have to go to a small relay ... Point of Failure.
The problem as I see it is ... When you talk to yourself or yell at yourself
(as needed) you will NOT have any sidetone in the headset. Lucky it is a
single seater 
Barry
"Chop'd Liver"
"Show them the first time, correct them the second time, kick them the third
time."
Yamashiada
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