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Voice/Control Channel Decoding Software - For discussion of software applications which decode digital voice formats and trunking control channels. Please use the HF Digital Signals forum for anything below 30MHz.

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  #61 (permalink)  
Old 07-22-2017, 2:13 PM
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Originally Posted by garys View Post
I'm monitoring a NXDN trunk system which is part of a network in eastern MA. One site seems to operating as a single frequency trunk as the control channel data is also a voice channel.

Has anyone else seen that sort of activity?
Yes - there is a site on a system in Maryland where when I last looked, only the control channel frequency was active and when the only user talked, they took over that frequency. The CC returned when they were done talking.

Not the same thing but I've monitored another system that used the control channel frequency as a voice overflow when all other frequencies on the system were in use.
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Old 07-22-2017, 2:47 PM
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Originally Posted by troymail View Post
Yes - there is a site on a system in Maryland where when I last looked, only the control channel frequency was active and when the only user talked, they took over that frequency. The CC returned when they were done talking.

Not the same thing but I've monitored another system that used the control channel frequency as a voice overflow when all other frequencies on the system were in use.
In Kenwood NexEdge terminology this is known as a "Non-dedicated Control Channel".

It can be used in a single channel trunking system. The channel will function as a control channel until a call is made, then it becomes a traffic channel. Useful for very low traffic sites. As you can guess, when the channel switches from a Control Channel to a Traffic Channel, other radios on that system are not able to hear the control channel signal.

It can also be used on a multi-channel site. If all the traffic channels are in use, you can allow the system to utilize the control channel for traffic.
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Old 07-22-2017, 3:47 PM
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Thank you. That's very helpful information.

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Originally Posted by mmckenna View Post
In Kenwood NexEdge terminology this is known as a "Non-dedicated Control Channel".

It can be used in a single channel trunking system. The channel will function as a control channel until a call is made, then it becomes a traffic channel. Useful for very low traffic sites. As you can guess, when the channel switches from a Control Channel to a Traffic Channel, other radios on that system are not able to hear the control channel signal.

It can also be used on a multi-channel site. If all the traffic channels are in use, you can allow the system to utilize the control channel for traffic.
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Old 07-22-2017, 5:59 PM
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Another question. The Channel numbers seem to go in an ascending order. 201 is lower than 202, which is lower than 203, etc...

Does this necessarily hold for channel numbers above 800? Does 801 have to be a lower frequency than 802? Or are all bets off?
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Old 07-22-2017, 6:25 PM
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Originally Posted by garys View Post
Another question. The Channel numbers seem to go in an ascending order. 201 is lower than 202, which is lower than 203, etc...

Does this necessarily hold for channel numbers above 800? Does 801 have to be a lower frequency than 802? Or are all bets off?
Hello,

If it is a standard UHF map, then any channel above 800 is a custom channel and can be anything.

73 Eric
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Old 07-22-2017, 7:56 PM
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As you can guess, when the channel switches from a Control Channel to a Traffic Channel, other radios on that system are not able to hear the control channel signal
This should have said "other radio on that SITE are not able to hear the control channel signal since it's been stopped so the channel can become a traffic channel. Usually the radios will throw an "out of range" message on the screen and beep, if set up that way.
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Old 07-22-2017, 11:18 PM
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Thanks. That gave me a good hint and I found the voice channel. It's Network 178, which you're familiar with. I have the frequency and Channel number matched.



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Originally Posted by EricCottrell View Post
Hello,

If it is a standard UHF map, then any channel above 800 is a custom channel and can be anything.

73 Eric
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