Site NAC's

[snoopyII]

Was doing some reading, and saw that on large trunk systems, some sites use a NAC to minimize interference from adjacent sites. (One of those "I didnt know that..." moments) I was looking through the site details of randomly picked sites and saw that Lookout has a NAC of D18, but didnt see any others showing NAC's in the notes. Is this usage common?

 

[MtnBiker2005]

Few other sites have it listed. Like in Eagle County area.

Site 235 = NAC D13 - Beaver Creek Ski Area
Site 250 = NAC D12 - Lower Dowd
Site 278 = NAC D1E - East Vail


RR Thread: http://forums.radioreference.com/colorado-radio-discussion-forum/232957-colorado-dtrs-nac-list.html

 

[snoopyII]

Thanks for the link to the other thread. Does anybody have a DB of Site NAC's they would be willing to share?

 

[jeffreyinberthoud]

I know from searching through other than the ones mentioned their are none on the DTRS system listed

 

[Mick]

From my logs

Confirmed NAC’s:
Site 148 = NAC D10 - Cheyenne Mtn
Site 411 = NAC D1B - Fountain Valley
Site 412 = NAC D12 - Stanley Canyon
Site 413 = NAC D1D - Ski Summit
Site 414 = NAC D1E - Calhan
Site 415 = NAC D1F - Woodland Park
Site 416 = NAC D10 - Austin Bluffs
Site 417 = NAC D11 - Airport
Site 419 = NAC D13 - Truckton
Site 421 = NAC D15 - Black Forest
Site 422 = NAC D16 - Templeton Gap
Site 424 = NAC D11 - Cedar Heights

Possible NAC's:
Site 101 = NAC D12 - Arapahoe/Denver
Site 102 = NAC D1D - Riley Peak/Denver Metro
Site 103 = NAC D1E - Silver Heights/Denver Metro
Site 104 = NAC D14 - West Creek/Denver
Site 105 = NAC D17 - Mount Thorodin/Denver Metro
Site 106 = NAC D1E - Squaw Mtn/Denver Metro
Site 107 = NAC D17 - Smoky Hill/Denver Metro
Site 110 = NAC D1A - Franktown/Denver Metro
Site 122 = NAC D16 - Boyero
Site 140 = NAC D18 - Punkin Center
Site 147 = NAC D1F - ZAP/Denver Metro
Site 161 = NAC D1D - Walking Stick
Site 164 = NAC D12 - Chevron/Denver Metro

 

[Spitfire8520]

Confirming the NAC for sites I can analyze right now.

Site 102 = NAC D12 - Riley Peak/Denver Metro
Site 103 = NAC D13 - Silver Heights/Denver Metro
Site 104 = NAC D14 - West Creek/Denver Metro
Site 106 = NAC D16 - Squaw Mtn/Denver Metro
Site 107 = NAC D17 - Smokey Hill/Denver Metro
Site 110 = NAC D1A - Franktown/Denver Metro
Site 172 = NAC D18 - Kiowa

 

[jeffreyinberthoud]

so I guess the data base should be updated? Itr does lead to a question however whats the point unless there are two diffrent sites with same freq?

 

[scanlist]

NAC's are useful for conventional monitoring like LAPD.

Unless someone is attempting to talk into a site NAC listings are not useful for trunking scanners.

 

[jimmnn]

How about with sites 418 Mt. Pittsburg and 420 Badger both on the same control channel 853.7375, and you get get them both from certain parts of the El Paso and Teller counties?

Jim<

 

[Cryptolog]

Couple of NACs

Site 420 Badger NAC is D14. Site 145 Badger NAC is D1D. Someone else will have to get Site 418.

 

[Spitfire8520]

Did some traveling through Denver and a little north, might as well add what I found. I also added the hex numbers for all the sites.

Site 101 (1) = NAC D11 - Arapahoe Admin/Denver Metro
Site 108 (8) = NAC D18 - Lookout Mtn/Denver Metro
Site 109 (9) = NAC D19 - DRDC CF/Denver Metro
Site 120 (14) = NAC D14 - DTB/Denver Metro
Site 147 (2F) = NAC D1F - ZAP/Denver Metro
Site 164 (40) = NAC D10 - Chevron/Denver Metro
Site 170 (46) = NAC D16 - Auraria Campus/Denver Metro
Site 313 (D) = NAC D1D - Buckhorn Mtn
Site 322 (16) = NAC D16 - Adams County Simulcast/Denver Metro
Site 355 (37) = NAC D17 - Ft. Lupton/Tri Area

And after looking at all these NAC's for all these sites, it looks like that pretty much every single site's NAC end number/letter is determined by the last character in the hex form of the site. That would mean Site 418 (12) Mt. Pittsburg has a NAC of D12 if the NAC's have been set uniformly.

 

[greenthumb]

The hex conversion thing is correct, but does not necessarily hold true for all sites (but will for most).

 

[jeffreyinberthoud]

So are these going to be put in DB?

 

[greenthumb]

Sure will!

 

[jeffreyinberthoud]

You Rock Mr greenthumb

It does bring up the next question will the software linked to RR pul those or will we have to enter manually stay tuned

 

[mikewazowski]

Have you ever seen a place in your scanner to enter a NAC for a trunked system?

Most scanners I know of don't use NAC's on trunked system so it would make little sense for the software developers to include this.

It's like an analog connect tone. It's in the database but no scanners use it at all.

 

[jeffreyinberthoud]

Ya my ARC XT / and My Uniden BC396xt has it for non trunk but not trunk

 

[K4SVT]

hey

MikeOxLong PM me please...urgent...thanks

 

[greenthumb]

I suppose where this would be most handy is if you are hearing a control channel and want to have another tool to determine which one it is if there is the possibility of receiving more than one site on the same frequency at your location. It would be interesting if the manufacturers incorporated the NAC so that you can ensure that it's the right system instead of just any system...

 

[jeffreyinberthoud]

are there specific NACS for the following P25 channels?

851.1 SMPX1
851.75 SMPX2
852.3 SMPX3
852.55 SMPX4
853.6875 SMPX5