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Nx700e cross link to Tetra assistance needed

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Jun 12, 2020
Athens Greece
Hello to everyone !
Early on 2009 i have managed to cross-link an NXR700 to Sepura srm3500.
Today I'm trying to link also Nx700 but i can't trigger ptt of nx700 it works only one way.
I'm not experienced and i have difficulties to understand very good terminologies like (COR-TOR)on manual and also i can't calculate properly resistors.
Here what i have done

srm console-------------------------nx db25

6---------------------------------------16 (programmed as COR low)

Attached you will find the console connector (also i have an external speaker out)
The radio is used in mix mode
Any help is appreciated


  • Sepura Mobile Gen2 Accessory Ports A3.pdf
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I ♥ Ø
Jul 27, 2005
I am a lineman for the county.
Today I'm trying to link also Nx700 but i can't trigger ptt of nx700 it works only one way.

Right, because Pin 16 on the NX-700E is only for sending the Carrier Operated Relay signal to the console. You'll need to assign another pin to act as Push To Talk, and you'll need to feed audio into the radio. Pin 6 is Mic input. Assign one of the Aux I/O pins for the push to talk.

Right now you only have it set up to send audio to the console, not console sending audio to the radio.
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