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building a repeater using two hytera dmr mobile radio and backtoback cable
- Thread starter emre
- Start date
- Status
Is it for VHF to UHF crossband or in-band repeat? If it is in-band, the back-to-back mobile radio method does not work for DMR. There are timing issues that a real repeater deals with.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
No. When a DMR radio is set for a duplex frequency pair, the radio is looking for a timing reference from the repeater to set the time slots. 2 back to back radios do not provide the required timing reference.
Project25_MASTR
Millennial Graying OBT Guy
While the repeaters may be made up of two mobiles, they have a custom interface and custom firmware board which identifies to the radios that they are a repeater.
Very few digital radios can be built into digital repeaters simply by purchasing a license key and building a serial crossover (null-modem) cable between the radio's serial interfaces.
Very few digital radios can be built into digital repeaters simply by purchasing a license key and building a serial crossover (null-modem) cable between the radio's serial interfaces.
n1das
Member
A pair of mobiles and an MMDVM board will work. The mobiles don't have to be DMR mobiles or even made by Hytera. A pair of analog mobiles can be used. The MMDVM can also do P25 (Phase 1) and NXDN digital modes.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Except it won’t pass encrypted transmissions.
bill4long
Member
MMDVM can encode/decode AMBE2 codec?
n1das
Member
It should work if just the payload data is encrypted because it won't care whether the traffic is encrypted or not. The radios using the repeater will handle it on their own. It won't work if the signaling frame is also encrypted in the radios because the data won't be recognized as DMR traffic.
n1das
Member
Yes. There are a few MMDVM based multi-mode ham repeaters in use that handle D-STAR, YSF, NDXN, DMR, P25 (Phase 1), and plain old analog. The FM discriminator output from the receive mobile goes into the MMDVM board. The digital modulation output from the MMDVM directly modulates the transmitter in the transmit mobile. Plain old analog mode is handled separately from the MMDVM. Incoming digital traffic won't open a CTCSS/PL or DCS/DPL decoder to trigger analog operation but will be handled by the MMDVM. Incoming analog traffic with the correct PL/DPL will be handled like a plain old analog repeater and won't be recognized by the MMDVM.
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bill4long
Member
Okay that makes sense. This setup can't actually be networked over Brandmeister etc., but will work as a local-only repeater. Thanks.
n1das
Member
The MMDVM can be networked or work as a local-only repeater.
There are many MMDVM based repeaters on the Brandmeister Network. A ham friend of mine has a 2m repeater in VT built from analog mobiles with an MMDVM and supports DMR and P25 (Phase 1) modes in addition to plain old analog. It is on the Brandmeister Network. DMR and P25 modes are networked with the MMDVM. Whether a talkgroup in either digital mode repeats locally or over the network depends on how the talkgroups are configured. Plain old analog mode repeats local-only.
The OP should look into getting an MMDVM to interface the two Hytera mobiles to make a DMR repeater.
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bill4long
Member
Having thought about it, there's no reason why it shouldn't work. Ignore previous.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
It may pass the encrypted voice data, but it will not pass the KID/CKR/IV needed by the receiving radios to decrypt the encrypted voice payload. Therefore MMDVM is useless for those needing a digital repeater that are using encryption. Believe me, there are those of us out there that are looking for a lower cost option for networked digital voice systems. Too bad the authors of the software won’t include encryption support for those of us hams that are allowed to use encryption on ham bands.
bill4long
Member
Why is that? Is that information coming from a side-channel?
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
It’s being stripped. The authors are intentionally cropping the potential of it because they have a hammy mentality.
bill4long
Member
Huh? Where does the data come from?
slicerwizard
Member
DMR voice headers have an encryption bit.
DMR PI headers contain the KID and MI fields.
All of that can be blocked.
DMR PI headers contain the KID and MI fields.
All of that can be blocked.
bill4long
Member
Are you saying MMDVM is intentionally stripping them off? If so, it would seem one could modify it and rebuild. MMDVM is open source.
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