What's the correct control channel

[mrlthse]

radio shack show the "sys id" also if you sit on the control channel for a while
and it show a percentage of,
I'd like to know what that is and what it used for.

 

[u2brent]

What is a system ID and what is it used for,
No one seems to know the answer.
Does AC33 belong to sometime or what does it do or acount for.

Nearly every modern day trunked radio system broadcast a system ID in addition to a Site ID

RR Database Home

The most complete database of radio communications data

www.radioreference.com

It identifies what/which trunked system the site is a part of.. In your specific case it refers to Salt Lake City Public Safety Motorola Type II Analog Trunked Communications System.
Note the information at the bottom of this screenshot:

Nearly every trunked system in the database has one posted on it's respective page. (these are easily located at the bottom of the county and state RR DB pages.) You can click on each system and view a System ID (Some have more than one and they will be listed too)

Additionally,
Scroll to the bottom of the following linked page, Note the field to type and Search by System ID under Search Trunked Radio Information:

RadioReference.com - Scanner Frequencies and Radio Frequency Reference Database

www.radioreference.com

When you sit on a frequency and see a system ID on your scanner you can do a search and find out really quickly if you've found something new or something that is existing.

A lot of what you are trying to accomplish has already been researched and documented. There are many ways to search the database and see if a frequency is in use or not. There are many other ways to perform searches, also on that page.

 

[gldavis]

The system ID (AC33 or 7202 or 420F) is what the computer uses to ID who it is. We use this number to ID what we are listening to. I also use the ID to know what to look up in the Radio Reference Database. It is just a way of knowing what system is who.

 

[mrlthse]

Good information,
Have you ever bought a item without receiving an owner manual to operate it,
That is what I have.
Now I more so understand what sys ID means
and I'll use that info to better monitor the radio closer.

 

[gldavis]

Real Hams don't need no stinkin' manual.

 

[mrlthse]

Yep You are correct again,
You never seems to stop amazing me,
However, some times a "brain fart" will slip in
and sometimes a written instruction even the one hard to understand are a good tool to have around.