Amatuer Radio Blog

DMR XLX Reflector codes

I’m just going to put this here until I memorize these….

6 Group Call - Talk on the XLX Reflector
64000 Private Call - Disconnect Channel
64001 Private Call - Switch to Module A
64002 Private Call - Switch to Module B
64003 Private Call - Switch to Module C
64004 Private Call - Switch to Module D
64005 Private Call - Switch to Channel E
64006 Private Call - Switch to Channel F
64026 Private Call - Switch to Module Z
65000 Private Call - Query Status
68020 Private Call - Connect to XLX Reflector 020

Reflectors usuage on DMR radios are a somwhat strange beast. The methodology employed to use them runs against the natural grain of how DMR is normally used. Whereas centralized networks such as BrandMeister and others simply use the transmitted DMR talk group ID or private call ID to route transmission to the correct DMR radio recipients, XLX on DMR uses a single dedicated talk group ID regarless of the reflector used.

XLX via a WPSD hotspot (pi-star) uses talk group ID 6. To connect to a specific reflector, i.e. XLX307A, using the above codes, you make a single private call (ker-chunk) to ID 68307. Then you make another single private call (ker-chunk) to ID 64001 to select reflector module A. From here on out, voice traffic to and from the Reflector (XLX307A) will be via talk group ID 6. To disconnect from the reflector, send a single private call (ker-chunk) to ID 64000.

The above manner of selecting a reflector is somewhat similar to that of reflector used on analog (non-digital) repeaters. Analog repeater use DTMF key tones to connect and disconnect to their reflectors. This difference here with XLX DMR reflectors is that we use we use private call ID codes, as shown above, to accomplish the same thing.

You might wonder why anyone would choose such a system of reflectors over simply using talk group ids for talk groups, but there are a few reasons for it. XLX reflectors, although capable of DMR, Fusion, and D-Star connections are much like D-Star reflectors in general, each reflector can have up to twenty-six modules (A-Z), each of which is the equivalent of an individual talk group on a normal DMR system. But because each reflector handles its own client connections a Reflector system is decentralized, and you can only be connected to one reflector and one module at any one time.

In contrast to reflectors, with the BrandMeister network and others like it, you can have statically enabled talk group ID’s active which will cause those groups to be transmitted whenever someone keys up on them. This means that it is possible to monitor several talk groups, instead of a single one as would be the case using a reflector.

Additionally, you can simply do a PTT key up on a different talk group ID and that talk group ID is now dynamically activated. The network simply forwards those groups on to your hotspot which then transmits them. This is why there exists a receive list in a DMR radio channel configuration, so that any talk group id, or private call ID in the receive list will cause the radio to unsquelch, besides the main ID for that channel. DMR radios for Hams usually have a promiscuous mode, where the radio simply unsquelch whenever a transmission is received, regardless of the ID received.

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