Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [dmr]

Digital mobile radio, a digital voice mode found on VHF and UHF bands.

19 questions
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Modulation details of Digital Mobile Radio (DMR)

I'd like to implement a digital demodulator for Digital Mobile Radio (DMR). Note I'm not concerned about decoding of the audio: I realize that requires a proprietary codec. What are the details of the DMR modem? I've found statements that it's…
Phil Frost - W8II
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Excessive frequency deviation for DMR handsets?

A Hytera DMR handset that I am working with has a frequency deviation of 2300-2700 Hz. This is higher than the expected 1944.0 Hz frequency deviation specified in the DMR specification (ETSI TS 102 361-1). Is it expected that low cost handsets have…
BigBrownBear00
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Repeater Amplifiers DMR vs Analog

I have recently purchased an amplifier for my repeater. This was actually my first amplifier purchase ever and should probably have asked more questions prior to buying it. The repeater is a Motorola XPR8400 UHF R1 running in dynamic mixed mode. …
Mike
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Blocking a specfic DMR ID

Is it possible to block a specific DMR ID Rx, sort of "ignore"? If so, is it repeater-based, or it has to be set locally, on radio? Speaking of popular md380/390 radios, there is a "Call Alert" feature on Contact list, but didn't find any…
YT5ZEC
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In Canada, if I want to use DMR encryption on ham radio, how should I share my encryption key?

In Canada, one is permitted to "use a code or cipher that is not secret" on amateur radio. (See: https://laws-lois.justice.gc.ca/eng/regulations/sor-96-484/FullText.html under "Communications with Radio Apparatus in the Amateur Radio…
Felix An
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How to send DMR SMS using MMDVM modem or hackrf?

I have a baofeng DMR radio with SMS feature, and since there is not much DMR radio owners in my area I want to do something myself. The easiest thing I can do I thought is to send myself some SMS as I did with a POCSAG pager using my hackrf one. But…
Hose Dias
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Digital Modes Transmission Traffic Comparisons

I am looking for data that compares the number of transmissions per month or year among the various digital modes such as DMR, D-star and Fusion. I want to see how popular these technologies have been over time.
ChiliYago
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DMR Repeated Audio Packets

I have been performing several weak signal tests using the DMR mode. One of three things seems to happen when a signal gets weak. Audio is completely dropped for duration of weak signal. Audio becomes distorted and garbled giving the "R2D2" sound…
Skyler 440
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What are the key differences between Hytera DMR and MotoTRBO?

What I'm really curious about is if anyone can provide a high level overview of the two technologies. I know that they are both utilizing the DMR standard, but from what I have read is that the way which the repeaters signal radios is slightly…
c.wendel
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Brandmeister API - How to get the Last Heard from the API

Using the API and looking thru the documentation I can't find anywhere how to pull the LastHeard that is on the LastHeard pages.…
Zippy
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A new ham should start with Digital or Analog Portable Radio?

I am interested in acquiring two portable radios to talk between a family member and me (both new hams), e.g. when we go trekking in a National Park or to communicate in the same city. We used PRM radios before, but we got now a ham license to be…
Fabián Iglesias
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Can the AT-D878UV be programmed for dPMR channels?

I am curious whether the Anytone AT-D878UV (which is a DMR radio) can be programmed to receive dPMR channels. I understand that the big difference between DMR and dPMR is the technique used to divide the 12.5kHz channels into 2 6.25kHz…
user48678
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Help with ZaStone D900

I ordered a ham radio from eBay (doesn't matter which one) and I have gotten a completely different one than what I ordered. I'm quite new to amateur radio so please excuse my innocence/idiocy. I received a ZaStone D900 and while I wait for eBay to…
Iain Rosen
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Direct call via the repeaters

Is it possible and if, how does it work, to establish direct DMR call between two stations through different repeaters? Does it work in the similar way as opening temporary groups on repeaters or some other magic is involved. As a example scenario,…
Hieronim
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Texting not working, Radioddity GD-77

I'm getting text message sending failed, from Radioddity GD77: "Message Sending Fail", on hotspot connected to 262993 as described here: https://www.pe2kmv.nl/wp/en/dmr-en/sms-functions-via-dmr/ I haven't been able to text before although audio…
NoBugs
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