Hi all,
First, I am new to the radioreference forum. I see there are three forums on digital voice, so I hope I chose the correct one
I have been doing some reading on DMR and dPMR and I have a couple of questions concerning dPMR:
- Looking on the well known shopping websites, there seams to be quite a few (mostly Chinese) radios out there that are advertised as being dPMR:
However, dPMR does allow quite a lot of freedom: tier 1 (TS 102 490) vs. tier 2 (TS 102 658), three different
modes in tier 2, 4 different voice codecs, choice of VOC bits.
Most of the shopping-websites provide very little technical information on there
Is there a centralised reference site (a wiki) for all the different dPMR radios out there and exactly what specifications they adhere to?
- What exactly is the technical difference between tier1 and the tier2/mode 1 (peer-to-peer)? (appart from the frequency-range og 466.1-466.2 Mhz and power-levels).
If you would manage to get tier1 radio and a tier2/mode1 radio on the same frequency, would they be able to communicatie with eachother?
(Yes, I did start browsing throu the ETSI specs).
- What is the exact difference between tier2/mode1 and tier2/mode2. I know the websites say "mode1 = peer-to-peer, mode2 = repeater", but what exactly is the difference on RF stream-level?
- I know there is DSD that should be able to decoce NEXEDGE (which is dPMR), but is there an full open-source stack of dPMR?
It would be nice to have the basic stack to write our own dPMR repeater for ham-radio use. Are there already projects for this?
Anybody interested in doing this?
- As dPMR has a VOC-option "11" (manufacter specific), it might be interesting if we cannot use this to create a version of dPMR for ham-radio using the codec2 voice-codec.
Anybody interested in this?
- I have been looking at the si4668 chip from silicon labs. This chip supports a number of modulation scemes, one of them being 4GFSK.
(see https://www.silabs.com/products/wireless/EZRadioPRO/Pages/Si446x.aspx)
Does anybody know what is exactly the difference / link between 4GFSK and C4FM?
Could this chip be used to build a low-power C4FM receiver/transmitter, something equivalent to the low-power D-STAR hotspot nodes?
Many thanks in advance.
73
kristoff - ON1ARF
First, I am new to the radioreference forum. I see there are three forums on digital voice, so I hope I chose the correct one
I have been doing some reading on DMR and dPMR and I have a couple of questions concerning dPMR:
- Looking on the well known shopping websites, there seams to be quite a few (mostly Chinese) radios out there that are advertised as being dPMR:
However, dPMR does allow quite a lot of freedom: tier 1 (TS 102 490) vs. tier 2 (TS 102 658), three different
modes in tier 2, 4 different voice codecs, choice of VOC bits.
Most of the shopping-websites provide very little technical information on there
Is there a centralised reference site (a wiki) for all the different dPMR radios out there and exactly what specifications they adhere to?
- What exactly is the technical difference between tier1 and the tier2/mode 1 (peer-to-peer)? (appart from the frequency-range og 466.1-466.2 Mhz and power-levels).
If you would manage to get tier1 radio and a tier2/mode1 radio on the same frequency, would they be able to communicatie with eachother?
(Yes, I did start browsing throu the ETSI specs).
- What is the exact difference between tier2/mode1 and tier2/mode2. I know the websites say "mode1 = peer-to-peer, mode2 = repeater", but what exactly is the difference on RF stream-level?
- I know there is DSD that should be able to decoce NEXEDGE (which is dPMR), but is there an full open-source stack of dPMR?
It would be nice to have the basic stack to write our own dPMR repeater for ham-radio use. Are there already projects for this?
Anybody interested in doing this?
- As dPMR has a VOC-option "11" (manufacter specific), it might be interesting if we cannot use this to create a version of dPMR for ham-radio using the codec2 voice-codec.
Anybody interested in this?
- I have been looking at the si4668 chip from silicon labs. This chip supports a number of modulation scemes, one of them being 4GFSK.
(see https://www.silabs.com/products/wireless/EZRadioPRO/Pages/Si446x.aspx)
Does anybody know what is exactly the difference / link between 4GFSK and C4FM?
Could this chip be used to build a low-power C4FM receiver/transmitter, something equivalent to the low-power D-STAR hotspot nodes?
Many thanks in advance.
73
kristoff - ON1ARF