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Characteristics of a trunk NXDN system

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troymail

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Not sure if this is the right place to ask but....

I'm curious about a local NXDN system -- the license says it is trunked (all licenses FB8). The license says it has two sites - one with 6 frequencies and the other with one.

The single frequency site appears to carry data bursts 1-2 times every 30 seconds or so.

Beyond that, I've seen no indication of a control channel or idle indicator on any of the 6 frequencies on the other site.

I'm suspecting the single frequency site is being used for unit location data - but that's just a guess.

Does this sound like a trunked system or conventional?

Thanks.
 

kd4efm

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With DSD+ you should be able to see what the single channel is doing, the other thing to think is that could be an Icom Type D channel, it will pulse like an analog LTR but it's NXDN Trunking. They could
be trying both platforms of trunking.

My 2 cents.

EFM
 

kd4efm

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I looked at the license, funny, APCO Intl did the application. (little laugh here) but the only way to tell what
it is, if you hear control tones on one channel, like a Batwing Control Channel, then that's a Kenwood System. If you hear pulsing on ALL the channels, then it would be an Icom system Type D.
 

kd4efm

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DSD just says NXDN48.... no pulses....
okay, then you should see the system ID as well if you're listening to the control channel.
in which case, you will see a ran code of 1 meaning Site 1, DSD will also tell you what the channel
numbers are also.
IF they are running encypted, DSD will tell you that also when you listen to one of the Traffic Channels.

as an operator of the system here in Florida, I can bet they are running encrypted.
 

troymail

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Nope - not encrypted.

The issue is that the license says trunked but I know the licenses aren't always correct. All indications are they are using the frequencies as conventional .. I'm just wondering if there is yet another form of a trunk system where there isn't a dedicated control channel and/or idle bursts. Other than the Site 2 frequency, I've seen no sign of any data/control and the bursts on the Site 2 frequency don't seem to match anything else I've seen up to this point.
 

kd4efm

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Nope - not encrypted.

The issue is that the license says trunked but I know the licenses aren't always correct. All indications are they are using the frequencies as conventional .. I'm just wondering if there is yet another form of a trunk system where there isn't a dedicated control channel and/or idle bursts. Other than the Site 2 frequency, I've seen no sign of any data/control and the bursts on the Site 2 frequency don't seem to match anything else I've seen up to this point.
Maybe they are in transition. IDK.

Evans

kd4efm Evans, sent using TapTALK on my HTC M9
 
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