New in R2.4B: Roaming RSSI per site

On 20 July, Motorola released R2.4B firmware for the second generation MOTORBO radios. In this system release, there are some important enhancements which I will detail here.

It is now possible to define a Roaming RSSI threshold per site, in IPSC and LCP. Previously only one Roaming RSSI level could be defined.
This is particularly useful if there are significant differences between the relative signal strengths from multiple sites in a system: the site with the best coverage and strongest signal could have a higher Roaming RSSI threshold thus preventing all the radios roaming to it.


Roaming Per-Site RSSI Threshold in IPSC.
Ticking the Use Per-Site RSSI Threshold in the Roam List un-greys the RSSI Threshold spinbox in the channel. Note that the channel should preferably be in the Channel Pool and IP Site needs to be ticked. The channel also needs to be in one of the roam lists.
These videos describe how to set up IPSC in the radios and repeaters.


Roaming Per-Site RSSI Threshold in LCP (Click to enlarge)
In LCP, ticking the Use Per-Site RSSI Threshold in the Site List un-greys the RSSI Threshold column in the site table.
These videos describe how to set up LCP.


  1. what is the GPS on revert channel for?

    1. When enabled, the GPS data will not be transmitted on the trunked channel. This setting only applies when Data List is set to None.

  2. there is in my opinion a feature that lacks that is more important than this one. If you are in a star topology IPSC and you have a IP link connection failure on the base station that your terminal is registered, it would be useful that terminal detects this event and force roaming so you wont be stuck on a standalone radio network.

  3. I would like to know more about the roaming algorithm or other settings that may affect the roaming beacon feature.
    I experience a low roaming response when the system is idle and only beacon is sent out. I have registered multiple beacon transmissions with low signal strength, but the radio does not perform a passiv search. When the beacon signal disappears almost completely, the radio makes a search. When there is a transmission in the system, it works well.
    The site has dense overlapping (buildings) and I want a strong signal due to rapid signal changes in the buildings.Beacon duration/interval 1.92s/30s according to System Planner.
    (I've noticed that the "Per-Site threshold" field in CPS is not "grey" (in channels) when you enter dBm roaming value in the roaming list ....?)

    1. Have you read this?

  4. Yes I have read the article and I do not like method A so I have measured the signal strength from the repeater and compared to the RSSI value that is set in the radio.I can receive multiple beacons without the radio making a channel change, but immediately when pushing PTT or receiving a transmission the ( passiv search)will take place.


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