Page 1 of 1

P25 to DMR

Posted: Tue Jan 21, 2020 4:41 am
by siacali
Would love to be able to use my P25 (Motorola) public safety radios to talk on DMR.

Re: P5 to DMR

Posted: Tue Jan 21, 2020 6:56 am
by HA2NON
P25 voice decoding and encoding is not supported by AMBE hardware.

Re: P5 to DMR

Posted: Thu Jan 23, 2020 4:27 pm
by ke6yjc
siacali wrote:
Tue Jan 21, 2020 4:41 am
Would love to be able to use my P25 (Motorola) public safety radios to talk on DMR.
We use an HBLink reflector to x-connect our DMR Talkgroup over to P25, works pretty well!

Re: P5 to DMR

Posted: Fri Jan 24, 2020 1:41 am
by N1FTE
HA2NON wrote:
Tue Jan 21, 2020 6:56 am
P25 voice decoding and encoding is not supported by AMBE hardware.
Per DVSI's website: "The enhanced full-rate AMBE+2™ vocoder is fully compatible with the older IMBE™ vocoder that was used in the APCO Project 25 Phase 1. Both vocoder rates can be set to run with or without Forward Error Correction."

Re: P5 to DMR

Posted: Fri Jan 24, 2020 9:41 am
by HA2NON
The vocoder maybe compatible, but the hardware they sell is not. They used to sell IMBE compatible vocoder hardware, but these are no longer available.

Re: P5 to DMR

Posted: Sun Jan 26, 2020 3:39 am
by vk4tux
https://www.dvsinc.com/products/usb_3k.shtml

"USB-3000-P25 TM
The USB-3000? P25 includes DVSI's patented Enhanced Dual-Rate Vocoder technology that is fully inter-operable with APCO Project 25 standard (TIA-102BABA). The USB-3000? P25 provides the enhanced AMBE+2? "full-rate" vocoder (7200 bps) plus the AMBE+2? enhanced "half-rate" (3600 bps) vocoder that are used in APCO Project 25 Phase 2. The enhanced full-rate AMBE+2? vocoder is fully compatible with the older IMBE? vocoder that was used in the APCO Project 25 Phase 1. Both vocoder rates can be set to run with or without Forward Error Correction. In addition to the APCO Project 25 rates, the USB-3000? P25 also supports all of the 61 built in rates that are available on the standard version USB-3000?. Refer to the USB-3000? Users Manual for more details."

Image

Re: P5 to DMR

Posted: Sun Jan 26, 2020 6:51 pm
by Tyrbiter
I can be pretty sure that what is inside the openSPOT3 is not one of those, so unless the chip used in one of the USB keys is available then it wouldn't be possible to use it.

Re: P5 to DMR

Posted: Mon Jan 27, 2020 8:45 am
by HA2NON
Thank you for the product link, but the ICs used in these USB sticks are not sold anymore.