Local Fire Dispatch Heard On AAR 037

[KV4JW]

I was monitoring the AAR frequency spectrum this afternoon using my Uniden BCD536HP. On AAR 037 I was hearing fire dispatch traffic from another county in the regional area (Upson County, GA). I listened long enough to determine where the fire department was located, looked up the info here on RR and sure enough, the frequencies are the same. Am I missing some small detail here? How is it this permissible by the FCC? What setting should I change on my scanner so AAR037 doesn't pick up this fire dispatch traffic?

 

[a417]

Are you also hearing RR traffic on 037? If you are not, there is the possibility that the local RR uses that freq on a secondary basis or not at all.

As you are scanning .665 CSQ, you will hear that FD every time. If you were scanning PL, listening FOR the FD, you would only hear 037 when it bled over if it was being simultanously transmitted, as your squelch settings would only open when a valid PL was decoded.


Have you ever heard RR traffic where you are on 037? If you haven't....I'd just lock it out if you don't want to hear the FD.

It is permissible by the FCC, because they say so. They will do their reviews, their co-channel licensee reviews, refer to your emission designations, look at your HAAT and your ERP to see how far you will be (USUALLY) heard, and they will approve who they see fit. There are only a finite # of allocations in these bandplans, current technology allowing, so in a place where a RR is usually not going to be heard or where there are no train tracks...they might just license out a frequency for entity to use.

I just spent a handful of minutes perusing those licensees, and the entity that is listed in the Wiki for AAR 037 in the wiki is not actually licensed (or the wiki doesn't have it, so in all likelihood it's a legacy use case that they USED to use it, and then that FD was granted it for full time use. Not being from GA or know that definitively, its all speculation. There are a great many people on here who would know more, they might chime in.

 

[K6CDO]

In areas with VHF Public Safety saturation, the FCC will allow a Pubic Safety user to license an unused RR frequency. There is some of this type of radio activity in California in the Sierra foothills.

 

[kayn1n32008]

What setting should I change on my scanner so AAR037 doesn't pick up this fire dispatch traffic?

That traffic will always be there, nothing you can do about that. However, if you set a PL/DPL to something other than 118.8Hz you won’t be bothered by it.


Sent from my iPhone using Tapatalk

 

[a417]

I think he's looking for a way to get the CSQ AAR freq. and NOT the 2B PL tone when it transmits. Impossible situation with his hardware.

 

[Mike_G_D]

I think he's looking for a way to get the CSQ AAR freq. and NOT the 2B PL tone when it transmits. Impossible situation with his hardware.

Don't the current and recent model Uniden's all have tone lockout capability? If the 536 the OP has does have this feature, he might give that a try. He would simply enter the CTCSS tone that the fire dispatch uses (118.8 Hz according to the RR ;isting the OP posted) as the tone to lockout and he should no longer hear the fire dispatches but should still hear the CSQ RR traffic.

I don't own a 536 but do have an older BCT15 which has this feature. Haven't used it too much but when I have it seemed to work well.

-Mike

 

[a417]

Don't the current and recent model Uniden's all have tone lockout capability?
I don't own a 536 but do have an older BCT15 which has this feature. Haven't used it too much but when I have it seemed to work well.

-Mike

Well, i'll be damned. It's been QUITE ([edit] over a decade) a while since i've used a newer uniden model for analog scanning, so I didn't know that was an option! Thanks Mike!

 

[KV4JW]

Thanks Mike! That's exactly what I needed to know! I appreciate everyone's help with this one.

-Jesse

 

[Randyk4661]

Simi Valley PD uses AAR45 160.785 as a channel. It is so strong, I can hear it on a handheld two counties over full quieting.
It is the only agency in the Southern California area that uses a AAR frequency that I am aware of.

 

[radioman2001]

We have Hatzola ambulance service in NYC on a few, there was a bus co using one for data, and when the skip is in we pick up an ambulance service from Boston on our road channel. The separation of radio types went out the window years ago, and if you don't use it you lose it.