# DigiRig Lite with N3FJP

**URL:** <https://forum.digirig.net/t/digirig-lite-with-n3fjp/10587>\
**Category:** Uncategorized\
**Tags:** digirig-lite, mode-cw\
**Created:** [June 25, 2026, 11:49am UTC](https://forum.digirig.net/t/digirig-lite-with-n3fjp/10587 "2026-06-25T11:49:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ko4wx](https://forum.digirig.net/letter_avatar_proxy/v4/letter/k/a3d4f5/32.png) [@ko4wx](https://forum.digirig.net/u/ko4wx)\
**Post date:** [June 25, 2026, 11:49am UTC](https://forum.digirig.net/t/digirig-lite-with-n3fjp/10587/1 "2026-06-25T11:49:33Z")

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May be a redundant question, but I’m getting a 500 error on search:

I have a spare DigiRig lite. Is there a way to use it with N3FJP to key a CW radio port (specifically, an FT857d, but any rig that you ground a port to key the rig)? PTT to the base of a 2N3904, perhaps?

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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:** [June 25, 2026, 3:54pm UTC](https://forum.digirig.net/t/digirig-lite-with-n3fjp/10587/2 "2026-06-25T15:54:15Z")

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You can use Digirig’s PTT switch to connect to CW port on the radio. This requires a homebrew cable:

3.5mm TRRS sleeve (GND) → 3.5mm TRS sleeve (GND)

3.5mm TRRS ring 2 (PTT) → 3.5mm TRS tip (CW)

The same method that normally triggers PTT (RST in Digirig Mobile or GPIO3/VOX in Digirig Lite) will trigger the CW.