Communications Support Forums
Hi,
I have a strange effect here in the German ham radio DMR networks...
Some certain transmissions coming from a DMR "hotspot" (one of those tiny boxes linking DMR with an integrated 10mW transceiver over the internet) can not be received by all radios. The crappy TYT MD-380 radios do receive it fine, while for example my beloved Motorolas (DP4801 and SL1600) just show a busy channel, with no audio at all. CC/TS/TG settings are fine, and the transmission appears in the correct TS/TG. It just does not unmute some radios. And even stranger, in our funny "linkage cloud" the DMR-MARC/Motorola repeaters transmit it correctly, the issue only shows on a BrandMeister/Hytera-repeater.
For sure it is some flag that is set wrong on the path through all the different networks.
What I hope to get through this post, what kind of flag in the DMR protocol could cause this? Maybe we could trace it down a bit easier if we get an idea WTF can cause such a behavior. We do not have access to a professional DMR tester, but we know how to use stuff like a SDR with DSD or gnuradio, wireshark, and the other normal debugging stuff an advanced hobbyist usually has around
Ralph, dk5ras.
I have a strange effect here in the German ham radio DMR networks...
Some certain transmissions coming from a DMR "hotspot" (one of those tiny boxes linking DMR with an integrated 10mW transceiver over the internet) can not be received by all radios. The crappy TYT MD-380 radios do receive it fine, while for example my beloved Motorolas (DP4801 and SL1600) just show a busy channel, with no audio at all. CC/TS/TG settings are fine, and the transmission appears in the correct TS/TG. It just does not unmute some radios. And even stranger, in our funny "linkage cloud" the DMR-MARC/Motorola repeaters transmit it correctly, the issue only shows on a BrandMeister/Hytera-repeater.
For sure it is some flag that is set wrong on the path through all the different networks.
What I hope to get through this post, what kind of flag in the DMR protocol could cause this? Maybe we could trace it down a bit easier if we get an idea WTF can cause such a behavior. We do not have access to a professional DMR tester, but we know how to use stuff like a SDR with DSD or gnuradio, wireshark, and the other normal debugging stuff an advanced hobbyist usually has around
Ralph, dk5ras.