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wdaniell(at)etb.net.co
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 Posted: Mon Sep 12, 2011 9:53 am Post subject: Radio wiring |
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A question for the assembled wisdom…..do the PTT wires need to be shielded?
As I understand it the standard is a 3 core shielded wire for each headset
<![if !supportLists]>· <![endif]>Audio: white cores and shield/earth
<![if !supportLists]>· <![endif]>Mic: 2 cores (red and blue)and earth/shield . Until you energize the mic by earthing it, it is “off”. In order to activate the mic you “energize” by earthing it through the operation of the PTT which connects the mic to the earth/shield.
I am probably expressing this badly but do I have it more or less right?
Will
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graeme bird
Joined: 15 Jul 2010
Posts: 434
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| Posted: Mon Sep 12, 2011 11:41 am Post subject: Re: Radio wiring |
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no the PTT doesnt earth the mic, its just a pull to ground 'logic type' input that changes the transceiver from receive mode to transmit.
you can normally use twin screened for mic and tel using the screen as common ground although only the mic really needs screening.
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Graeme Bird
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Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
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gavanne(at)iconz.co.nz
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| Posted: Mon Sep 12, 2011 2:55 pm Post subject: Radio wiring |
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For the PTT you can use single core shielded wire using the shielding as the earth connection at both ends
For the headsets use 3 core shielded as you say, mic, audio and earth but make sure you earth the shielding as well on the radio end only, just cut it off at the headset end and leave it, if you earth the shielding at both ends it creates its own circuit and you will have interference
Gavin…..#355….. ZK-EPA
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of William Daniell
Sent: Tuesday, 13 September 2011 5:50 a.m.
To: europa-list(at)matronics.com
Subject: Radio wiring
A question for the assembled wisdom…..do the PTT wires need to be shielded?
As I understand it the standard is a 3 core shielded wire for each headset
<![if !supportLists]>· <![endif]>Audio: white cores and shield/earth
<![if !supportLists]>· <![endif]>Mic: 2 cores (red and blue)and earth/shield . Until you energize the mic by earthing it, it is “off”. In order to activate the mic you “energize” by earthing it through the operation of the PTT which connects the mic to the earth/shield.
I am probably expressing this badly but do I have it more or less right?
Will
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