Unknown Federal Frequencies

[jfhtm350]

Today I picked up two frequencies in a search with a Pro-106:
167.3625 P25:167 (Possible FBI)
173.7625 P25:130 (Possibly NC Blue Ridge Parkway)
I recieved these within a few min of the other. Usually I get a NAC instead of P25: number so Im guessing it may be P25 phase2. The transmission was encrypted or the scanner didnt decode it.

Anyone know what exactly what they are or where they came from and what kind of digital it is?

[MtnBiker2005]

Decoding the NAC doing the P25 repeater pulse every few minutes without any audio on those GRE/RadioShack scanners.

[ChrisP]

Originally Posted by jfhtm350

Today I picked up two frequencies in a search with a Pro-106:
167.3625 P25:167 (Possible FBI)
173.7625 P25:130 (Possibly NC Blue Ridge Parkway)
I recieved these within a few min of the other. Usually I get a NAC instead of P25: number so Im guessing it may be P25 phase2. The transmission was encrypted or the scanner didnt decode it.

Anyone know what exactly what they are or where they came from and what kind of digital it is?

It is P25 "Phase 1" digital. No indication that federal agencies are going to try and use TDMA on their conventional systems.
If your radio is showing a P25 NAC, then it is decoding the digital signal just fine. If they are encrypted, then you should hear the encrypted voice traffic that sounds like robots. If you don't hear anything at all, that can be someone just keying up a repeater without saying anything. Or in some cases, the repeaters are announcing their presence to radios that might be roaming in the area. This option is called "vote scan" and allows the radio to pick the closest repeater.

- Chris

[jfhtm350]

I realized later that your right about the P25 tag. I must have been thinking of a trunked system and I would say its Phase1. They do sound like robots and probably encrypted. I have another P25 entity that sounds about the same to me if it doesnt decode the signal. Havent heard them anymore since the first time.

[ATF1224]

173.7625 $130 is the Blue Ridge Parkway.

[jfhtm350]

Alrighty. Thanks for the confirmation. Havent heard another peep out of these 2 frequencies. Must have caught some skip or something. I have picked up 2 other freqs from the Blue Ridge Parkway National Park.

[jfhtm350]

I see its in the database now. I thought I checked it before. Oh well, I dont remember now.

[ff-medic]

Originally Posted by jfhtm350

Today I picked up two frequencies in a search with a Pro-106:
167.3625 P25:167 (Possible FBI)
173.7625 P25:130 (Possibly NC Blue Ridge Parkway)
I recieved these within a few min of the other. Usually I get a NAC instead of P25: number so Im guessing it may be P25 phase2. The transmission was encrypted or the scanner didnt decode it.

Anyone know what exactly what they are or where they came from and what kind of digital it is?

http://www.angelfire.com/ok/ozzhead/FBIFreqs.txt

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EDDIE'S FREQUENCY PAGE - governmant


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"167.3625 167.9 US FEDERAL BUREAU OF INVESTIGATION"
http://www.freqofnature.com/resource...ca20060209.pdf


Google did not take that long.

Somewhere, on this site...someone from your neck of the woods if I am correct in recollection, asked a similar question....about a year or so ago. FBI? Customs?. Something to that effect.

With Nextel Phones, and avaibility of State Police freqs.......If you heard someone on that freq, it may or may have not been the FBI, as Federal Agencys share freqs with different NAC's ( Previously PL's ).

FF - Medic !!!

[ecps92]

A Word of Caution for those relying on the Angelfire.com and the many other copies of that FBI list, it's only good for it's Historical and Hysterical value.

Many of the listing [New England] are from the 80's and the Bureau has gone thru 2 changes [Analog] since and then the migration to P25 brought more changes.

Originally Posted by ff-medic

http://www.angelfire.com/ok/ozzhead/FBIFreqs.txt

---------------------------------------------------------------------------
Google did not take that long.

Somewhere, on this site...someone from your neck of the woods if I am correct in recollection, asked a similar question....about a year or so ago. FBI? Customs?. Something to that effect.

With Nextel Phones, and avaibility of State Police freqs.......If you heard someone on that freq, it may or may have not been the FBI, as Federal Agencys share freqs with different NAC's ( Previously PL's ).

FF - Medic !!!

[KC2zZe]

Ditto to Bill's comments above. I'd also hesitate to refer anyone to a site that hasn't been updated in almost seven years (freqofnature) and lists agencies that no longer or never existed (Eddie's).

[ff-medic]

Originally Posted by ecps92

A Word of Caution for those relying on the Angelfire.com and the many other copies of that FBI list, it's only good for it's Historical and Hysterical value.

Many of the listing [New England] are from the 80's and the Bureau has gone thru 2 changes [Analog] since and then the migration to P25 brought more changes.

I did not know. I though the VHF freqs were still the same, just additions of P25 with encryption and UHF.

FF-Medic !!!

[ecps92]

YMMV - but here in New England much of what is listed in those lists is very 1980/1990 and so very out-dated.

No, not true for VHF - what was listed as Repeaters many-times was actually the input and with the changes in 2000 [pre-P25] lots of changes [input and output changes] did occur.

Some sites were de-activated, others activated.

Some agencies kept systems on the air, but never used them [cellphone and nextel reliance] until the FUBARS occurred and now are back to using two-way radios

Originally Posted by ff-medic

I did not know. I though the VHF freqs were still the same, just additions of P25 with encryption and UHF.

FF-Medic !!!

[ff-medic]

Originally Posted by ecps92

YMMV - but here in New England much of what is listed in those lists is very 1980/1990 and so very out-dated.

No, not true for VHF - what was listed as Repeaters many-times was actually the input and with the changes in 2000 [pre-P25] lots of changes [input and output changes] did occur.

Some sites were de-activated, others activated.

Some agencies kept systems on the air, but never used them [cellphone and nextel reliance] until the FUBARS occurred and now are back to using two-way radios

Not that it makes any differnece now - But the FBI no longer has the 163 ( and 167 mhz?? ) Mhz allocation?

And if they had freqs, why change the freqs with the encryption. No one could hear them anyway.

On or about June of 1992, while searching the VHF band with a scanner; the scanner stopped on a VHF freq, and I heard a voice recording ( pager ) for someone to report to the office or something like that. It was about 2:00 am when I heard it. I looked up the allocation = VHF --> It was federal government. There is a Federal Building about 30 minutes south of where I live. I believe that is where the transmission came from, and the "Duty Agent" was paged in. I don't have my log book here with me, it is at my parents house. If I my memory is correct - it was 163 mhz ( ?? FBI ).


FF-Medic !!!

[nd5y]

The main reason they changed was because several years ago the federal government narrowbanded and created a bandplan for the 162-174 band.

Now all new federal systems are supposed to use 162-166.5 repeater inputs, 166.5-169.5 single frequency simplex, 169.5-173.2 & 173.4-174.0 repeater outputs.

The FBI still uses 167 MHz and their old 162-163 MHz channels are now mainly repeater inputs.

[ecps92]

Inputs here in New England are still 162-166, many Rptrs still 167-173

Originally Posted by ff-medic

Not that it makes any differnece now - But the FBI no longer has the 163 ( and 167 mhz?? ) Mhz allocation?

And if they had freqs, why change the freqs with the encryption. No one could hear them anyway.

On or about June of 1992, while searching the VHF band with a scanner; the scanner stopped on a VHF freq, and I heard a voice recording ( pager ) for someone to report to the office or something like that. It was about 2:00 am when I heard it. I looked up the allocation = VHF --> It was federal government. There is a Federal Building about 30 minutes south of where I live. I believe that is where the transmission came from, and the "Duty Agent" was paged in. I don't have my log book here with me, it is at my parents house. If I my memory is correct - it was 163 mhz ( ?? FBI ).


FF-Medic !!!