# UZ7HO Soundmodem and EXT PTT

**URL:** https://forum.digirig.net/t/uz7ho-soundmodem-and-ext-ptt/2941
**Category:** Uncategorized
**Tags:** pstrotator, digirig-lite, software-soundmodem, yaesu-ft-817nd
**Created:** [January 10, 2024, 10:34pm UTC](https://forum.digirig.net/t/uz7ho-soundmodem-and-ext-ptt/2941 "2024-01-10T22:34:18Z")
**Posts on this page:** 1
**Showing post:** 7

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### Author: ![K0TX](https://forum.digirig.net/user_avatar/forum.digirig.net/k0tx/32/3_2.png) [@K0TX](https://forum.digirig.net/u/K0TX)
#### Post date: [January 16, 2024, 1:24am UTC](https://forum.digirig.net/t/uz7ho-soundmodem-and-ext-ptt/2941/7 "2024-01-16T01:24:38Z")

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Steve,  
Depending on what level on CM108’s GPIO triggers PTT (low or high), there are two connection variants (red or blue).

Here’s how it will look like for Digirig 1.9 according to the schematic above:

 ![cm108-ptt](https://forum.digirig.net/uploads/default/original/2X/3/3cc2b2eba180e7b814fa9a3f4826e7c779f38ad9.png)

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