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art(at)zemon.name
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 Posted: Sun Sep 03, 2017 2:28 pm Post subject: Wiring PTT Switches |
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Folks,
I need advice on how to wire the PTT switches for my plane. Here is a bit of the wiring diagram for the PDA360EX audio panel:
[img]cid:ii_15e49cd788375187[/img]
Clearly I have a shielded cable running from pins 33, 34, 35 on the PDA360EX to the microphone jack in the instrument panel.
What do I run to the PTT switch in the grip on the joystick? It looks like an unshielded pair of wires to me.
Thank you,
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
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enginerdy(at)gmail.com
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| Posted: Sun Sep 03, 2017 2:42 pm Post subject: Wiring PTT Switches |
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People often use single strand with shield.
It's not ultra-critical and will probably work fine as a pair of wires. The biggest consideration is reducing stress points so it doesn't break from flexing.
On Sep 3, 2017, at 6:16 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
| Quote: | Folks,
I need advice on how to wire the PTT switches for my plane. Here is a bit of the wiring diagram for the PDA360EX audio panel:
<Selection_003.png>
Clearly I have a shielded cable running from pins 33, 34, 35 on the PDA360EX to the microphone jack in the instrument panel.
What do I run to the PTT switch in the grip on the joystick? It looks like an unshielded pair of wires to me.
Thank you,
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
|
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ceengland7(at)gmail.com
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| Posted: Sun Sep 03, 2017 3:48 pm Post subject: Wiring PTT Switches |
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Two regular wires are fine, and will be easier to connect than messing with a shield. There's nothing on the PTT lead except current-limited DC voltage. When you push the PTT, it shorts that line to ground and the radio detects that 'LO' as a signal to go into transmit mode.
Do look at that drawing carefully, before doing your wiring. At first glance, I thought it was drawn wrong. Also, does the doc address making sure the 'mic lo' terminal on the jack is isolated from the airframe?
Charlie
On 9/3/2017 5:40 PM, Daniel Hooper wrote:
| Quote: | People often use single strand with shield.
It's not ultra-critical and will probably work fine as a pair of wires. The biggest consideration is reducing stress points so it doesn't break from flexing.
On Sep 3, 2017, at 6:16 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
| Quote: | Folks,
I need advice on how to wire the PTT switches for my plane. Here is a bit of the wiring diagram for the PDA360EX audio panel:
<Selection_003.png>
Clearly I have a shielded cable running from pins 33, 34, 35 on the PDA360EX to the microphone jack in the instrument panel.
What do I run to the PTT switch in the grip on the joystick? It looks like an unshielded pair of wires to me.
Thank you,
-- Art Z.
--
https://CheerfulCurmudgeon.com/ "If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
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art(at)zemon.name
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| Posted: Sun Sep 03, 2017 7:23 pm Post subject: Wiring PTT Switches |
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On Sun, Sep 3, 2017 at 6:50 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | Two regular wires are fine, and will be easier to connect than messing with a shield. There's nothing on the PTT lead except current-limited DC voltage. When you push the PTT, it shorts that line to ground and the radio detects that 'LO' as a signal to go into transmit mode.
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Charlie,
Sweet. Thanks for explaining.
| Quote: | Do look at that drawing carefully, before doing your wiring. At first glance, I thought it was drawn wrong. Also, does the doc address making sure the 'mic lo' terminal on the jack is isolated from the airframe?
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Yes, PS Engineering is explicit about isolating the jacks from the airframe and about only grounding one end of the shield. Their docs are really good.
Cheers,
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
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nuckolls.bob(at)aeroelect
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| Posted: Wed Sep 06, 2017 9:57 am Post subject: Wiring PTT Switches |
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At 05:40 PM 9/3/2017, you wrote:
| Quote: | People often use single strand with shield.
It's not ultra-critical and will probably work fine as a pair of wires. The biggest consideration is reducing stress points so it doesn't break from flexing.
On Sep 3, 2017, at 6:16 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
| Quote: | Folks,
I need advice on how to wire the PTT switches for my plane. Here is a bit of the wiring diagram for the PDA360EX audio panel:
<Selection_003.png>
Clearly I have a shielded cable running from pins 33, 34, 35 on the PDA360EX to the microphone jack in the instrument panel.
What do I run to the PTT switch in the grip on the joystick? It looks like an unshielded pair of wires to me. |
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PTT wires don't benefit from shielding. Truth
be known, there's probably not one mic installation
in 100,000 that benefits from shielding. A twisted
trio of unshielded would be just fine.
You can extend your PTT wiring up the stick
on a twisted pair . . . if you want to
bring the ground back to the mic jack.
If you want to ground the PTT switch inside
the grip with other grounded controls, then
a single strand to the PTT (tip) contact
will do it.
If the PTT switch is already connected to
a common ground in the grip, then the single
strand approach is fine. If you want to run
the twisted pair, be sure to DISCONNECT the
PTT grip switch from other grip switches . . .
Bob . . .
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