simplex dmr

[ahlawy81]

when is it possible to add the feature of simplex dmr decoding

[LouisErigHerve]

I've tried to implement the DMR simplex decoding several times without any success... the symbol decoder is very unstable in TDMA mode and I think it need to be rewritten...

I have no delay to implement this feature as I already try it several times in vain.

[ahlawy81]

thanks for reply
I've wondering as i thought that you have been trying on simplex signals in your videos

[francisuk1989]

Give this a try as this works for me to decode DMR via Simplex, I am using a anytone at-d878uvii plus to test this so no idea if Hytera/Motorola or Kenwood will work but with Anytone you active the Simplex menu by

Menu > Settings > Chan Set > DMR mode > 1, Simplex

No idea if repeater inputs will work but using 2m calling frequency via 145.500 works great!

dsd -xx -fr

**** Digital Speech Decoder 1.8.4-dev (build:v1.6.0-113-g4b1a9c9)
**** mbelib version 1.3.0
Expecting non-inverted X2-TDMA signals.
Decoding only DMR/MOTOTRBO frames.

[2022-05-29 01:24:13] Sync: +DMR mod: C4FM inlvl: 30% [slot1] slot2 | Color Code=11 (OK) | VOICE e:| TG=17 Src=9501 FID=0x00 RAS (FEC OK/CRC ERR)

[LouisErigHerve]

For information, DSD now support the DMR simplex, it is not yet perfect but it decodes audio

Please note the following issues :

• The slot is always fixed to "1" (unless you have selected the "Dual Capacity Direct Mode")
• The simplex works only on un-squelched signals (uncheck the "squelch" checkbox on your SDR tool)
• When a transmission starts the very first frames (like Voice Header) are lost (this is due to the 4FSK decoder stability)

I'm trying to fix the decoder to be more stable.