DMR-System Types

[lion2479]

How can one tell what type of DMR system a business/company is using? IP site connect utilizing one repeater with two TG's, CC's and TS's or could this be set up as Linked Capacity Plus system since the company has two other repeater licenses and repeater frequencies, but nothing has been heard on them?

Any help would be appreciated for those experienced in these types of systems. I know my business uses one repeater pair currently and I am able to monitor the two TG's on the one frequency. However why would they be licensed for 2 more repeater pairs and nothing has been heard on anything on them.


You thoughts would be appreciated.

 

[N1GTL]

LCP will beacon about every 2 seconds.

 

[Project25_MASTR]

Capacity plus is interesting but predictable. Every transmission the rest channel becomes the next slot. For example, if you have a two repeater site, the system will start out on the master's slot 1. After the next transmission from a subscriber, slot 2 will become the rest channel, then slot 3 and then slot 4. The system will then restart at slot 1 as the rest channel.

Capacity plus can also be used on a single channel (it's actually how some shops prefer to handle customers using 3 talkgroups or more one a single channel).

Something important to note. In the license it'll give you a list of locations for the FB2s. That will tell you where the other repeaters are licensed.

 

[Mikek]

An SDR and software like DSD+ will tell you the system type, and much more, about the system.

 

[N1GTL]

Every transmission the rest channel becomes the next slot. For example, if you have a two repeater site, the system will start out on the master's slot 1. After the next transmission from a subscriber, slot 2 will become the rest channel, then slot 3 and then slot 4. The system will then restart at slot 1 as the rest channel.

This is somewhat programmable. You can specify a "preferred" rest channel and the system will revert to that after some inactivity. You can also change the "rest channel time-out-timer". I learned this on a 4 repeater site. Repeater 4 NEVER was keying up and becoming the rest channel. I expected the rest channel to rotate between the 4 repeaters as you mentioned. A call to /\/\ revealed that setting is used to tell the repeater to take itself out of the rest channel rotation if it has not been used for a rest channel for x minutes. The default is 8. That last repeater would only go back into the rotation if 6 different talk groups keyed up and it was needed. You can disable this and it will use them all as you explained above.