RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Scanners and Receivers Forums > Uniden Forums > Uniden Thread Archives

Uniden Thread Archives A depository of archived threads from the original Uniden forum.

 
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 11-20-2013, 12:47 AM
AE7Q's Avatar
Member
  Shack Photos
Shack photos
Amateur Radio Operator
Amateur Radio
 
Join Date: May 2013
Location: Mill Creek, WA
Posts: 65
Question BCD996XT: out of channels!

Is there a clever trick to be able to create more than 500 channels in a trunked system? The Seattle area is by no means huge, and I'm running into the 500 channel limit per system, especially since the 996XT counts site frequencies in the 500 channel limit (or at least appears to), and the King-County system has over 100 site frequencies. Some are duplicate (eg, backup sites), but removing the few duplicates only provides minor relief.

In a conventional system it's easy; you just create another system & groups, and divvy up the channel frequencies in some meaningful way.

Also, in a trunked system, you can create a duplicate system (with the same sites), and divvy up the TGIDs the same way. You then have to (to make the split-up meaningful) set both systems to ID-scan rather than ID-search. Obviously, this duplication impacts scanning speed, and you don't see TGIDs in use that are not programmed. Ugh. Double Ugh.

While I'm on the subject, 20 groups per system is way too low, but there are easy work-arounds for that.

I hope the new BCD536HP removes these limitations. The (beta) manual didn't mention any limits, other than the size of the microSD card. With modern software techniques, that's how it should be (no limits except for total memory size), but we all know that things occasionally aren't like they should be ...
Sponsored links
  #2 (permalink)  
Old 11-20-2013, 1:03 AM
cherubim's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Dec 2011
Location: Sydney, Australia
Posts: 232
Default

The 500 talkgroups per system limit is one of my biggest gripes about the 396XT/996XT series. I monitor a large statewide P25 system which has over 1200+ talkgroups and only my GRE PSR-600 & PSR-500 are capable of holding that many TG's in one profile. The limitation of course is that only 32 CC's can be monitored in one TSYS obkject..

The PSR-800 has no limit on the number of talkgroups and is only restricted by the size of the microSD card. I'm hoping the BCD436HP/BCD536HP has the same type of limitation.
  #3 (permalink)  
Old 11-20-2013, 1:08 AM
Member
   
Join Date: Oct 2007
Posts: 5,231
Default

No, there is no way to get around the limit per-system, it's hard coded.

Sounds like the first thing you need to do is weed out all of the voice frequencies for each site, and leave only the known control channels. That'll reclaim some of those channels right off the top.

Beyond that, you're going to have to figure out which talkgroups you don't really care about listening to, since there appear to be 494 of them in the system.

I count 27 frequencies in the entire system that are flagged as control channels, which means you can program 473 talkgroups, and would need to decide which 21 talkgroups you don't care about having programmed.


As far as the limitation with newer Uniden models, the HP-1 does not have a limit and neither should the BCD436HP or BCD536HP.
  #4 (permalink)  
Old 11-20-2013, 1:55 AM
AE7Q's Avatar
Member
  Shack Photos
Shack photos
Amateur Radio Operator
Amateur Radio
 
Join Date: May 2013
Location: Mill Creek, WA
Posts: 65
Thumbs up Thanks, that's a BIG HELP !!!

Quote:
Originally Posted by Chauffeur6 View Post
No, there is no way to get around the limit per-system, it's hard coded.

Sounds like the first thing you need to do is weed out all of the voice frequencies for each site, and leave only the known control channels. That'll reclaim some of those channels right off the top.

Beyond that, you're going to have to figure out which talkgroups you don't really care about listening to, since there appear to be 494 of them in the system.

I count 27 frequencies in the entire system that are flagged as control channels, which means you can program 473 talkgroups, and would need to decide which 21 talkgroups you don't care about having programmed.


As far as the limitation with newer Uniden models, the HP-1 does not have a limit and neither should the BCD436HP or BCD536HP.
Why can I delete the voice frequencies? Is that because the control channels contain that raw frequency (rather than a coded version) when assigning a frequency?

That's a BIG HELP; THANKS !!!

I only count 26 control/alt frequencies; as I noted before, some are duplicates. I assume the only reason to keep around duplicates, is for location-based filtering, is that correct?
  #5 (permalink)  
Old 11-20-2013, 2:03 AM
Member
   
Join Date: Oct 2007
Posts: 5,231
Default

The XT series tracks Motorola and P25 systems in "Control Channel Only" mode, which means it only needs to have the control channel frequencies programmed, not the voice frequencies.

The control channel doesn't send a raw frequency for 800 MHz system voice channels, rather it sends the channel # which is translated into the actual frequencies by the scanner. That is where the custom bandplan comes into play.

I'm not familiar with the site layout for the Seattle-King County system, but it looks like there are a few main simulcast sites, with a few individual fill-in sites as well. You basically only need to program the sites that you actually monitor. If you drive all over the area, then it probably wouldn't hurt to have them all programmed, especially if you have a GPS connected to the scanner and use location-based scanning.
Sponsored links
  #6 (permalink)  
Old 11-20-2013, 2:29 AM
AE7Q's Avatar
Member
  Shack Photos
Shack photos
Amateur Radio Operator
Amateur Radio
 
Join Date: May 2013
Location: Mill Creek, WA
Posts: 65
Talking Thanks again!

Quote:
Originally Posted by Chauffeur6 View Post
... would need to decide which 21 talkgroups you don't care about having programmed.
Thanks; there are a few talk groups associated with the Seattle sewer system, which I think I can do without ...
  #7 (permalink)  
Old 11-20-2013, 10:49 AM
bwhite's Avatar
Member
   
Join Date: Dec 2004
Location: Balto/Carroll, MD
Posts: 1,459
Default

If I understand what you are attempting, I set up the same system in 2 diff banks (I hope I have the terminology right) and added the police talkgroups in one bank and the fire to the other effectively doubling what I could monitor.
 

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 1:04 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2011 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions