Uniden Bcd436 hp Scanning Data

[436isthe1]

When scanning a statewide P25 system does the scanner scan it twice, once with data signal and once with no data signal? When I monitor my scanner on the Scanner Monitor App it shows that. And if so WHY?

 

[jtwalker]

It scans the control channels for the sites you have programmed. Don’t understand what you think you are seeing. Do you have the system and sites repeated in more than one favorites list?

 

[436isthe1]

It scans the control channels for the sites you have programmed. Don’t understand what you think you are seeing. Do you have the system and sites repeated in more than one favorites list?

NO, when Im in Scanner Monitor its show the site scanning and data signal , then it shows sites without data signal. Scans them twice.

 

[ofd8001]

If you are asking about the "P25/LNK/DAT", here is what that means:

P25 Displays if the channel is receiving digitalized voice in Receiving or Hold modes.
LNK Displays when data is received on a voice channel in Receiving or Hold modes. (sort of like unmodulated "carrier" but digital isn't "carrier")
DAT Displays when data is received on a control channel in Receiving or Hold modes.

The scanner will spend about 1.5 seconds listening to the control channel for each site. If it "hears" a channel grant (permission to use a voice channel) for a talkgroup you have instructed it to monitor, it will then tune to that granted voice channel and monitor the transmission. If there are no grants, the scanner moves on to the next site and repeats the process. It will do that until each site is listened to at least once (longer if you increase the system hold time) and then leave the system looking for another system to scan.

So you could have a scenario of where the scanner detects a channel grant, but it is not in your scan list, so it keeps monitoring the control channel.

But to your specific question, no it does not necessarily scan a system twice.

 

[hexagon_keyhole]

If you are asking about the "P25/LNK/DAT", here is what that means:

P25 Displays if the channel is receiving digitalized voice in Receiving or Hold modes.
LNK Displays when data is received on a voice channel in Receiving or Hold modes. (sort of like unmodulated "carrier" but digital isn't "carrier")
DAT Displays when data is received on a control channel in Receiving or Hold modes.

The scanner will spend about 1.5 seconds listening to the control channel for each site. If it "hears" a channel grant (permission to use a voice channel) for a talkgroup you have instructed it to monitor, it will then tune to that granted voice channel and monitor the transmission. If there are no grants, the scanner moves on to the next site and repeats the process. It will do that until each site is listened to at least once (longer if you increase the system hold time) and then leave the system looking for another system to scan.

So you could have a scenario of where the scanner detects a channel grant, but it is not in your scan list, so it keeps monitoring the control channel.

But to your specific question, no it does not necessarily scan a system twice.

Yep. I want to add that if you do straight copy via Sentinel, you usually get the voice and control channels, and usually your scanner locks on the primary control channel frequency. Not a bad idea to have all the frequencies, as sometimes control channels/radio systems can go haywire and the contingency plan for the system could go conventional.

 

[436isthe1]

Yep. I want to add that if you do straight copy via Sentinel, you usually get the voice and control channels, and usually your scanner locks on the primary control channel frequency. Not a bad idea to have all the frequencies, as sometimes control channels/radio systems can go haywire and the contingency plan for the system could go conventional.

Thank you.