RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > U.S. Regional Radio Discussion Forums > Alabama Radio Discussion Forum

Alabama Radio Discussion Forum - Forum for discussing Radio Information for the State of Alabama.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #261 (permalink)  
Old 03-07-2017, 11:14 AM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2002
Posts: 3,674
Default

Just to clarify. Does the CC rotate through all channels, or is it that any channel can be used as the CC channel?

Today's CC is the same as yesterday, which is why I ask.

Quote:
Originally Posted by milf View Post
On Harris systems all freqs are cc

Sent from my LG-K330 using Tapatalk
Reply With Quote
Sponsored links
  #262 (permalink)  
Old 03-07-2017, 11:15 AM
milf's Avatar
Careful, I CAN hear you!
  RadioReference Database Admininstrator
Database Admin
 
Join Date: Dec 2002
Location: Indianapolis, IN
Posts: 10,842
Default

All can rotate and usually do once system is fully online

Sent from my LG-K330 using Tapatalk
__________________
Admin for AR, IN, LA, MS, and TN
PRO-92, PRO-92B, PRO-96 x 2, BCD396XT, BCD436HP+DMR
HT-1250 LS+, APX6000XE
Reply With Quote
  #263 (permalink)  
Old 03-07-2017, 2:58 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2002
Posts: 3,674
Default

Thanks. I'll probably only have a bit more time to listen on this trip. After that, i'll likely only be in the area a time or two. I'll be just as happy if they stay on the EDACS system a cew more months.


Quote:
Originally Posted by milf View Post
All can rotate and usually do once system is fully online

Sent from my LG-K330 using Tapatalk
Reply With Quote
  #264 (permalink)  
Old 03-08-2017, 5:28 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Dec 2002
Location: Hill Country Village TX, EL09
Posts: 1,279
Default 770.50625

Quote:
Originally Posted by codeplug View Post
Site 04 - Pelham, AL - 1000 Houston Drive
Frequencies: 770.50625 / 770.80625 / 771.15625 / 772.61875 / 773.74375 / 774.39375
I heard transmissions on 770.50625 NAC 46A this morning between 6:55 and 7:19. One call was to "Hokes Bluff Road". Very good signal into Childersburg.
Reply With Quote
  #265 (permalink)  
Old 03-09-2017, 10:39 AM
Member
   
Join Date: Dec 2002
Location: Huntsville, Alabama
Posts: 169
Default

Our system in Madison County can be active in Baldwin County if they turn the talkgroups on down there. Same for Morgan Co. and the Clanton and Montgomery towers. Some agencies have permission to use those, some don't. Scan usually does not work.
For instance, if I am going to a meeting in Montgomery, AL which may have 10 or so rf "channels" and I scan everything in my radio back home in Madison County, I am going to quickly tie up several of Montgomery's 10 channels. However, if I am only allowed to hear one at a time, I am tying up much less of their resources.
Usually, if I am in the Montgomery, Prattville or Clanton areas, I am monitoring Madison County Sheriff Dispatch 1 on those towers.
Reply With Quote
Sponsored links
  #266 (permalink)  
Old 04-07-2017, 8:35 AM
Member
   
Join Date: Sep 2003
Location: Tennessee
Posts: 40
Default

Same question here. Can anyone confirm if this is true or not? Last time I was in Huntsville I never landed on Madison city PD.

Quote:
Originally Posted by Kc124 View Post
Does anyone know if the City of Madison Police Department police talkgroup is now encrypted? I was able to hear them but can no longer. The following talkgroup id is what I'm using.

30325 7675 D MPD DISP Police Dispatch
Reply With Quote
  #267 (permalink)  
Old 04-07-2017, 10:36 AM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Sep 2001
Location: Huntsville, AL
Posts: 38
Default

Madison Police are using Dispatch 2 for operations which is encrypted. Dispatch 1, which is not encrypted, was used in the beginning and up until several months ago. A very reliable source told me that a particular police captain did not want the news media hearing dispatch because it could give people a bad perception of Madison.
Reply With Quote
  #268 (permalink)  
Old 04-07-2017, 10:57 AM
medic9351301's Avatar
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2002
Location: birmingham
Posts: 933
Default

A reliable source in Birmingham told me that it's the agency's choice on encryption.
The Jefferson county 800 system has went through. Upgrades. He told me he choose to leave dispatch channels open but all other law channels .example Homewood pd has a open dispatch channel. But uses a tac channel for dispatch .
__________________
medic9351301
Reply With Quote
  #269 (permalink)  
Old 04-11-2017, 12:52 PM
codeplug's Avatar
Member
   
Join Date: Sep 2004
Location: Alabama
Posts: 249
Default Conecuh County - 700 MHz

Conecuh County - 700 MHz
Can Someone check these Possible AFRN Tower Sites to see if they are Active/On-the-Air.
Please post any info found on these sites.
This Tower Site below is now On-the-Air and is showing up on the Cherokee County Tower Sites as a Neighbor Site.

Sysid -- RFSS --- Site ----- Name ----------------------------- County
46B ---- 2 (2) ---- 015 (F) - Evergreen (Fire Tower) ------ Conecuh County

771.93125 = Red - Control Channel Primary (c).
Site Location Above Not Confirmed but the Control Channel is Active.

<>

Conecuh County AL - (SY) Trunked Public Safety 700 MHz
Call Sign: WQWH720

Site Locations:
Site Location 01 - Evergreen, AL - Conecuh County - US Hwy.31 (South Tower)
Frequencies: 773.99375 / 774.43125 / 774.91875

Site Location 02 - Belleville, AL - Conecuh County - Belleville Fire Tower (West Side)
Frequencies: 769.76875 / 771.018750 / 771.718750

Site Location 03 - Evergreen, AL - Conecuh County - Sepulga Fire Tower Road (Fire Tower)
Frequencies: 769.30625 / 771.28125 / 771.93125

Site Location 04 - Brooks, AL - Conecuh County - Brooks Fire Tower (East Side)
Frequencies: 771.54375 / 772.33125 / 772.70625

Site Location #'s are not Confirmed, Reference Only.
Emission Designators: 8K10F1E, 9K80D7W
Reply With Quote
Sponsored links
  #270 (permalink)  
Old 04-12-2017, 11:31 AM
bob-the-scanner-man's Avatar
Member
   
Join Date: Dec 2007
Location: Central AL
Posts: 468
Default

I hate to see E making its way into Jefferson County. Unfortunately that seems to be the name of the game with the AFRN. Wouldn't surprise me if in another 5 years or so most of everything worth listening to in this area will go E.

I understand why agencies do it, but with there being such a push for transparency in government it seems counterproductive.
__________________
Radioshack Pro-96
Uniden BC-246T
Reply With Quote
  #271 (permalink)  
Old 04-19-2017, 3:40 PM
RadioJonD's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Dec 2002
Location: At the hairdresser's, past the liquor store.
Posts: 496
Default

This will sound amateurish but I know next to nothing about these huge systems.

I’ve noticed on AFRN & other states 700 MHz systems that some agencies operate with encrypted and non encrypted channels. Is encryption achieved through the system or by something programmed into each radio? In other words, when switching between non encrypted and encrypted channels, is there another step each unit has to take, like flipping a switch, to activate encryption?

If encryption is through the system and seamless for radio users, would inputs, then, be in the clear? Could it be that simple? I suspect not but I hope someone here listens to inputs and can say for sure.
__________________
"Communications without intelligence is noise, intelligence without communications is irrelevant"
-- General Alfred M. Gray, USMC, Retired

Last edited by RadioJonD; 04-19-2017 at 3:46 PM..
Reply With Quote
  #272 (permalink)  
Old 04-20-2017, 5:24 PM
morganAL's Avatar
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Nov 2005
Location: Somerville, AL
Posts: 337
Default

The encryption and decryption is done in the radio. Each encryption key is assigned a reference number that is part of the transmitted data that tells the receiving radio which key to use to decode the encryption. Every talkgroup can use the same encryption key or each talkgroup can have a separate key.

Talkgroups can be programmed to be clear and then the user presses a button and then it is encrypted or the talkgroup is encrypted 100% of the time with no user intervention. The latter is the most common way since the user doesn't have to decide.

To answer your question though, inputs are encrypted as well.
Reply With Quote
  #273 (permalink)  
Old 04-21-2017, 8:49 AM
RadioJonD's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Dec 2002
Location: At the hairdresser's, past the liquor store.
Posts: 496
Default

Quote:
Originally Posted by morganAL View Post
The encryption and decryption is done in the radio. Each encryption key is assigned a reference number that is part of the transmitted data that tells the receiving radio which key to use to decode the encryption. Every talkgroup can use the same encryption key or each talkgroup can have a separate key.

Talkgroups can be programmed to be clear and then the user presses a button and then it is encrypted or the talkgroup is encrypted 100% of the time with no user intervention. The latter is the most common way since the user doesn't have to decide.

To answer your question though, inputs are encrypted as well.


Very well explained. Thank you, morganAL!
__________________
"Communications without intelligence is noise, intelligence without communications is irrelevant"
-- General Alfred M. Gray, USMC, Retired
Reply With Quote
Reply

Tags
sticky

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 10:18 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions