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Tennessee Homeland Security District 7

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Revision as of 13:04, 19 January 2017 by Kd4ygg (talk | contribs)

PLEASE READ THESE NOTES REGARDING THIS SYSTEM !!!

This NXDN4800, 6.25kHz trunked system is a seven county regional trunking system initiated by the Tennessee Homeland Security Distict 7 council of Montgomery, Stewart, Houston, Humphreys, Cheatham, Dickson and Robertson Counties to allow interoperable communications.

Some frequencies are licensed to Greer Communications, service provider of the system.

Some are in the normal public safety bands, some are in the normal business bands.

Business users are also on the system.

The system uses a 6.25kHz channel spacing and each site's channel mapping plan is unique.


Site RAN's are same as Site ID #. By searching the 451-455 Mhz and 460-465 Mhz bands, this system should be able to be mapped correctly.

SITES 01 through 19 are in the correct order for programming the TRX-1 and TRX-2 scanners to follow the system.

ANY HELP IN DETERMINING THE CORRECT FREQUENCIES ON OTHER SITES WOULD BE APPRECIATED. ANY CORRECTIONS ARE GREATLY APPRECIATED.

Programming this system for the TRX-1 and TRX-2: Program the site(s) of interest in the order shown. Set Site Threshold Low to 50%. Set Site Threshold High to 95%. Set Site Dwell to 20 (2 seconds). Set Talkgroup Delay to 20 (2 seconds). Program the RAN code as HEX - NOT DECIMAL!!! If in doubt, leave it to "ANY". Do NOT check NXDN-D setting. Set Band Plan to USA.

Channel Maps listed below are from DSD+

Channel Map for Site 01 - Clarksville

019   451.881250 Mhz
021   451.893750 Mhz
045   452.287500 Mhz
271   461.375000 Mhz
273   461.387500 Mhz
397   463.512500 Mhz
503   452.334375 Mhz
504   452.337500 Mhz

Channel Map for Site 03 - Dover

131   TBD
209   TBD
259   TBD
269   TBD
281   TBD
302   TBD
411   TBD
505   453.50625 Mhz
508   TBD

Channel Map for Site 04 - McKinnon

509   TBD
510   TBD
511   TBD
512   453.31875 Mhz

Channel Map for Site 05 - Cumberland City

513   TBD
514   TBD
515   TBD
516   453.24375 Mhz

Channel Map for Site 06 - Dickson

059   TBD
098   TBD
125   TBD
236   460.4375 Mhz
519   TBD
520   TBD

Channel Map for Site 07 - Charlotte

074   453.2375 Mhz
086   TBD
446   TBD
448   TBD
485   TBD

Channel Map for Site 08 - Erin

070   TBD
145   TBD
232   460.4250 Mhz

Channel Map for Site 09 - Sage Hollow

143   453.7875 Mhz


Channel Map for Site 10 - Stewart

227   460.36875 Mhz

Channel Map for Site 17 - Ashland City

224   460.36250 Mhz
242   460.61250 Mhz
281   461.46250 Mhz
395   463.46250 Mhz
422   463.68750 Mhz
501   464.93750 Mhz

Channel Map for Site 18 - Pleasant View

251   460.36750 Mhz
323   461.83750 Mhz
392   463.48750 Mhz
459   464.46250 Mhz