Push to talk wiring

RVNewsletter · Post by **RVNewsletter** » Sat Jan 02, 2010 11:04 am

This is a problem I'm having with reading the schematic for a typical mic jack connection. Specifically, I'm trying to square away two seemingly different identifications on the PS engineering wiring harness tutorial regarding where the two wires for the push to talk come off the mic switch.

Check the images and notations I've made on the blog.

lgcdmb · Post by **lgcdmb** » Sat Jan 02, 2010 2:52 pm

The schematics/sketches are confusing in that the tip and ring wires are shown in different positions. If you look at the mic plug, tip is the end connector on the male end of the plug. Ring is next, separated by an insulator, and the barrel is last, separated by another insulator. The mic cable will be on the barrel end of the plug. In each of the sketches, the tip connector on the jack is furthest from the barrel. In all cases, ptt is connected to tip.

If you look at the physical jack, the tip connector is furthest away from the insertion point. The sketches show the wires coming off the end of the jack rather than the body, so it doesn't really represent what you see when you're looking at the jack. When you connect the wiring, just think of the tip, ring, and barrel positions on the plug and wire accordingly on the jack. You may want to use a continuity tester to confirm the electrical paths.

It took me a while to get my arms around the terminology when I first started looking at the wiring, but once I learned that tip, ring, and barrel refer to the plug electrical connection positions, it began to make sense. There doesn't appear to be any standard on showing tip and ring on schematics.

RVNewsletter · Post by **RVNewsletter** » Sat Jan 02, 2010 3:27 pm

So, if I understand this right, basically, one PTT wire goes to the tip and the other PTT wire goes to the barrel..ground..audio_lo...sleeve.... whatever they call it.

lgcdmb · Post by **lgcdmb** » Sat Jan 02, 2010 6:30 pm

Yes, IMHO.

RVNewsletter · Post by **RVNewsletter** » Sat Jan 02, 2010 8:16 pm

Went back out to the hangar (-3) and rewired it all. Thanks for the help.

Post by **Spike** » Sat Jan 02, 2010 8:59 pm

As in -3 degrees?

RVNewsletter · Post by **RVNewsletter** » Sun Jan 03, 2010 9:10 am

Yeah, it got up to +2 yesterday. Started at -14. This morning it's -10. It takes a real man to build an RV in Minnesota.