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Press-to-talk switch wiring.

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dean.psiropoulos(at)veriz
Guest

Posted: Sun Oct 15, 2006 10:00 pm Post subject: Press-to-talk switch wiring.

I have UPS Aviation Technologies (now Garmin) SL-30 and GX-65 radio stack

with their audio panel (actually PS6000 guts and UPS AT nameplate).  In the

installation drawings they show the PTT switch across two of the microphone

connections (Mic Key and return) but don't say anything about shielding or

twisting the pair.  Lectric Bob's drawings show a twisted pair of wires from

the Press to Talk switch to the radios.  Is there anything to be gained by

doing this if the installation drawings don't show it?  I know the fields

cancel each other out in a twisted pair but if these are not twisted will

they pick up unwanted electrical noise and feed it into the Mic inputs? 



I have the pilot's PTT on a Ray Allen stick grip, the wires will feed

through a common hole in the spar along with a bundle of other wires (mostly

power wires for strobe pack, taxi, landing, position lights and pitot

heater).  What I would like to do is utilize the 5 conductor wire that Ray

Allan sells (for use with his Stick and Trim Servos) to connect the PTT to

the radios.  The three other wires in this cable will carry discrete signals

for Ez Pilot Servo disconnect, Radio frequency flip/flop and a light that

will be used intermittently by the trim control module to display status and

faults.  The Ray Allan 5 wire bundle is not shielded and the wires are

twisted but only about 1 turn for 1.5 inches of length.  If I need to use

twisted pair will this work or will there be interference from the other

wires in the bundle (these wires will only have signal very intermittently)?

Will the 1 twist per 1.5 inches of length be enough to satisfy a requirement

for a twisted pair?  Thanks.



Dean Psiropoulos

RV-6A  N197DM

Last 1% of the 90% to go

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nuckollsr(at)cox.net
Guest

Posted: Mon Oct 16, 2006 6:21 am Post subject: Press-to-talk switch wiring.

At 01:56 AM 10/16/2006 -0400, you wrote:



 	  Quote: 	
		  

<dean.psiropoulos(at)verizon.net>



I have UPS Aviation Technologies (now Garmin) SL-30 and GX-65 radio stack

with their audio panel (actually PS6000 guts and UPS AT nameplate).  In the

installation drawings they show the PTT switch across two of the microphone

connections (Mic Key and return) but don't say anything about shielding or

twisting the pair.  Lectric Bob's drawings show a twisted pair of wires from

the Press to Talk switch to the radios.  Is there anything to be gained by

doing this if the installation drawings don't show it?  I know the fields

cancel each other out in a twisted pair but if these are not twisted will

they pick up unwanted electrical noise and feed it into the Mic inputs?



I have the pilot's PTT on a Ray Allen stick grip, the wires will feed

through a common hole in the spar along with a bundle of other wires (mostly

power wires for strobe pack, taxi, landing, position lights and pitot

heater).  What I would like to do is utilize the 5 conductor wire that Ray

Allan sells (for use with his Stick and Trim Servos) to connect the PTT to

the radios.  The three other wires in this cable will carry discrete signals

for Ez Pilot Servo disconnect, Radio frequency flip/flop and a light that

will be used intermittently by the trim control module to display status and

faults.  The Ray Allan 5 wire bundle is not shielded and the wires are

twisted but only about 1 turn for 1.5 inches of length.  If I need to use

twisted pair will this work or will there be interference from the other

wires in the bundle (these wires will only have signal very intermittently)?

Will the 1 twist per 1.5 inches of length be enough to satisfy a requirement

for a twisted pair?  Thanks.


	


   There is no requirement to twist PTT wires. I often twist pairs or trios

   of wires specific to a task just to keep them together and easily

   identified in a wire bundle. Also, twisted wires put lower stresses

   into the strands for situations where you're bringing PTT wires up

   the control stick and the wires will be subject to a lot of flexing

   at the bottom.



   You can use the wire you've cited . . .



   Bob . . .

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