August 2026 - op25-dev - lists.osmocom.org

error message help [1 Attachment]
by n3zra＠yahoo.com [op25-dev] 25 Aug '26

25 Aug '26

I am very new to using Ubuntu OS and O op25. I cannot get the system running, my rtl sdr does work on the virtual box but op 25 is not starting. attached is the error message I am getting. I appreciate the the help. Thank you in advance. Andy N3ZRA

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Identifying a wireless protocol used by casino equipment
by gedeonluc＠proton.me 23 Aug '26

23 Aug '26

Hello, I am experimenting with SDR and I recently came across a wireless device used in a commercial environment. I suspect it may be using a proprietary radio protocol, but I am having trouble identifying the modulation and signal characteristics. I can capture the signal with an SDR, but I am not sure which Osmocom tools would be most appropriate for analyzing it. Has anyone worked on identifying unknown digital radio protocols with Osmocom or related SDR tools? Any advice on how to approach the initial signal analysis would be appreciated. Thanks.

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Seeking help/clarification on DMR Reverse Channel signalling
by Adrian Musceac 23 Aug '26

23 Aug '26

Hello OP25 devs, I'm an amateur radio operator working on implementing an open source DMR tier 3 trunked radio base station based on a multi-carrier SDR structure. I have reached a point where I no longer know how to interpret the ETSI standard and I thought to ask for help here due to your expertise with trunked radio systems. The outbound Reverse Channel PDU is used in DMR tier 3 for MS power control and MS de-key (transmit interrupt). Based on my interpretation of the standard, a couple of things are clear: 1. Reverse channel is only available if aligned timing is used 2. It is supposed to be embedded in voice burst F of a voice transmission on the alternate timeslot 3. The MS is supposed to monitor the alternate timeslot during transmit and derive RC information from it There are a few scenarios where it seems to me these tier 3 services (power control, priority interrupt) cannot be available at all... 1. Alternate timeslot is a control channel 2. Alternate timeslot is idle 3. Alternate timeslot carries something other than voice payloads The standard doesn't clarify these cases and I have doubt that these 2 services can even be reliably implemented. Are you able to help me understand how the Reverse Channel is used in the real world by existing industry implementations of DMR tier 3? Thanks, Adrian YO8RZZ

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