Pilot PTT Hi, Lo

Discussion of aircraft electrical system design, construction, and problems.

Pilot PTT Hi, Lo

Postby Darick » Sun Jul 24, 2016 5:56 pm

This sure seems like a dumb question, but...

On my factory supplied wiring harness, there are two wires bundled together, one labeled pilot PTT Hi, one labeled pilot PTT Lo. I have the usual SPST momentary button on the stick. What's the difference? Do they just attach to the two poles on my switch? When the PTT button is pressed it will make contact between the two wires.

My common sense side says it doesn't matter. The point is to complete the circuit using the momentary switch to transmit.
Darick Gundy
Sonex #1646
Taildragger, Aerovee, center stick, Prince P-Tip Prop
MGL E1, F2, V6 radio, Sandia Xponder, Reserve lift indicator (AOA), iFly 520
First flight! 10/21/2017
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Re: Pilot PTT Hi, Lo

Postby Rick524 » Sun Jul 24, 2016 7:46 pm

Hi Darick; I bet if you check the PTT lo wire with an ohmmeter to ground, its grounded.
It may be included in case the radio gets installed in a fiberglass
plane where grounds are hard to come by.
Just connect the PTT hi to the center terminal and the PTT lo to the bottom terminal on
the PTT switch and you're good to go.

Sonex 524
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Joined: Fri Jun 03, 2011 11:40 am

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