P25 Cross mode

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VA3JCD
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P25 Cross mode

Post by VA3JCD » Thu May 02, 2019 10:27 pm

Hi All.
On the IP connector I can do cross mode to and from DMR and NXDN but I can't seem to get P25 working with DMR and or NXDN, is P25 intended to have cross mode ability with DMR and NXDN.

Thanks.
Cliff. :D

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HA2NON
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Re: P25 Cross mode

Post by HA2NON » Fri May 03, 2019 6:42 am

P25 cross mode is only supported with a C4FM/Fusion radio which is in VW (voice wide) mode.
Norbert "Nonoo" Varga, HA2NON
SharkRF Team

VA3JCD
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Re: P25 Cross mode

Post by VA3JCD » Fri May 03, 2019 2:16 pm

Thanks for the reply and hope in the future this will be possible.

Thanks.
Cliff. :D

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Re: P25 Cross mode

Post by vocoder » Sat May 04, 2019 3:35 pm

You have to understand that P25 uses IMBE voice encoding which is the same format used by Yaesu for VW (Voice Wide) mode. To cross mode P25 or VW to NXDN you would need a vocoder to transcode the audio to AMBE. This is not going to happen. No hotspot currently on the market has a built-in vocoder.

VA3JCD
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Re: P25 Cross mode

Post by VA3JCD » Mon May 06, 2019 12:19 am

Thank you for the reply.
Is there any way to add it as a plugin on IPC as a option?.

Thanks.
Cliff. :D

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Re: P25 Cross mode

Post by vocoder » Wed May 08, 2019 12:35 am

No. It's beyond the scope of the SharkRF IP Connector Protocol server. A company called DVSI (Digital Voice Systems, Inc) holds the patent on the AMBE (Advanced Multi-Band Excitation) voice compression algorithm. You would need a hardware solution from DVSI, something like this , this , or this , to legally transcode between IMBE (Improved Multi-Band Excitation) and AMBE. You can see it gets :shock: real fast.

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