List of trunked frequencies

[Jay911]

Hi all, I've been mucking around in PPS for a bit on somebody else's device's profile (I don't own one myself, offered to look at the programming for him). Got a question:

I imported a system from RR CSV. I couldn't import all the sites I wanted because it complained that I was going over 255 control channel frequencies. This system re-uses CC freqs all over the network. There are really only 218 CC freqs in the system. When I look at panel D2, P25 Trunking System Setting, Control CH List, it's listing all the CCs by site with the site name as the "note". Does the same freq need to be listed multiple times if it's used in multiple sites? For example if "771.59375" is on "Site 1" and also on "Site 2", does it need to be listed twice in the Control CH List?

 

[N6ML]

I believe that you would need to have the list of control channels defined for each site, separately. Each site should have a different site ID, so when attempting to locate a site for a system, I expect that the firmware would try each site, scanning the control channel frequencies, until it decodes control traffic with a matching site ID.

Short answer: yes (I believe)

 

[sparklehorse]

The Unication PPS doesn't lend itself to managing a huge number of anything. My advice is to enter just the CCs for the sites you will be within range of anytime soon. I guess that won't work if you're constantly traveling to every nook and cranny of your state, but for most folks four or five or ten sites will cover their needs perfectly well. Doing a road trip next month to a far corner? Make a new codeplug with the needed sites for the trip and upload it to the radio. There's also a way to forego entering a bunch of sites by entering in a wildcard so the pager will search for neighbor sites if it looses signal on the current site. The problem with that is it will hang on to a site for too long before it searches, meaning you will have some garble and missed transmissions as the signal becomes marginal.
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[IAmSixNine]

Also in large wide area systems that reuse frequencies there is often a lot of distance between those sites. So programming in the correct site ID and its matching CC is important. If you were to put in an ID of a site across the state but its also used close to you it wont pick it up as the ID is incorrect.
@sparklehorse is spot on, program only the closest sites you know you can hear based on your location. If you plan to travel a lot update with the ones along the route. But programming every site in a huge system is probably over kill for an average user.

 

[Jay911]

Thanks guys, yes I decided to just put in the ~30 sites that would be in the areas the user would be working in most often (I probably went overboard but not by a huge amount - the response areas are large and the sites have some good overlap in places). That still resulted in 196 or some frequencies - didn't check to see how many dupes were in there at that point, so long as I was under 255 I was happy.

I'm used to my two-way programming where I just dump the CC freqs in - all of them - and the site table is literally just an alias list to show me "Site Name" instead of "Site 52-01" etc.

Thanks again!

 

[LEH]

I am waiting for my G3 to fully test this theory. I took the Virginia STARS table and copied. I removed all the data except the frequencies. I tried to write a Regular Expression search to remove any channel that did not have an 'a' or 'c' at the end of the frequency number (a good text editor can do this if you're better at regular expression writing than I am).

Bottom line I took only the control channels and then removed the duplicates. For the WACN and SYSID I kept the WACN and changed SYSID to FF. Then I made a CSV file and imported only the control channels with RFSS and SITEID as FF.

Theoretically this should work as the pager will find the strongest CC and then decode the site info.

It was a bit tedious, but I think it will work. If anyone in VA with a G5 VHF and wants to test my CSV out, I'll be glad to share it.

Best bet though is if you are not all that mobile, just use the sites nearest you.