While at a location near I-44 and Northwest Expressway in the middle of the night, I found a new federal frequency of 172.6875. It sounds like APCO-25 but it has a PL tone of 67.0. Can anyone with an APCO-25 card take a listen and see if this is TSA. TSA uses 169.300 and 172.900 at the Will Rogers Airport, but I didn't pick up anything up on those frequencies while searching. I may be too far from the airport to hear TSA, but then who am I hearing from up here? What's really odd is that I'm pretty sure APCO-25 isn't compatible with a PL tone and I'm sure there is one during transmissions.
Anyone with APCO-25 Scanner in OKC?
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According to the post at http://www.radioreference.com/forums/showthread.php?t=1085,
It looks like there can't be an APCO-25 signal with a PL tone. But that's sure what it sounds like...mancow said:
Sometimes my P25 scanner (796) will "decode" a 67.0 tone on the link part of the transmission (the "tail" of the repeater). There really is no tone, but the scanners will pick that up sometimes.
I think the US Marshals use something in there, but I can't remember the exact freq. I'll try listening to that one to see if I can figure out what it is.
I think the US Marshals use something in there, but I can't remember the exact freq. I'll try listening to that one to see if I can figure out what it is.
It is IMBE P25, as decoded by a BC-396T. Full-strength downtown (I'm not on ground level though).
They are talking now...
"20, show that we just got access to the service organizational side..."
Any ideas?
They are talking now...
"20, show that we just got access to the service organizational side..."
Any ideas?
The 67.0 tone was exactly as you described -- at the end of the transmission. You mentioned it is at the tail of the repeater transmission, so this is probably a repeater channel and not simplex. I wonder if this is Marshals or maybe some Justice Department agency. I seem to remember 4-digit identifiers used by the Marshals, not two-digit ones, unless they are just omitting the prefix (they did that occasionally). This should be a good find -- we'll have to see what shows up. Please continue to post what is heard if you don't mind. I sure wish I had P25 capability. What could the "service organizational side" be?
I'll let it record this evening and see if anything comes up. If so, I'll try to attach it on this post.
They seem to have cars (gave an ending mileage) and provide security for some building (1st floor was "clear").
I made recordings, but even if I zip them, they are larger than 194 kB (which shows to be my limit). I'll try uploading them on my website or something.
Website audio: http://members.cox.net/mam1081/172_6875-12-3-05_1.wav
and
http://members.cox.net/mam1081/172_6875-12-3-05_2.wav
Also - someone mentioned that it might be the Veterans Hospital downtown. I heard them say something like "Radiology Clear"...
I made recordings, but even if I zip them, they are larger than 194 kB (which shows to be my limit). I'll try uploading them on my website or something.
Website audio: http://members.cox.net/mam1081/172_6875-12-3-05_1.wav
and
http://members.cox.net/mam1081/172_6875-12-3-05_2.wav
Also - someone mentioned that it might be the Veterans Hospital downtown. I heard them say something like "Radiology Clear"...
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Well, I was SO excited to get my BCD396T in yesterday, so I could dial up 172.6875 and listen to some digital stuff. However, all I'm hearing on my 396 is what I hear on my other scanners, and get the same PL of 67.0 on the end. Now, go easy on me since I haven't completely read through both the radio manual and the UASD manual, but I can't see a setting to specify that it's an APCO freq, or to set some global setting to decode APCO.
Any ideas what I need to do?
Any ideas what I need to do?
Turn off CTCSS/DCS search for the channel (or any programmed tone for that channel). If you have this option turned on, the scanner will not be able to determine that the signal is P25, so will never start decoding.
Lucky you! I wish I had a digital scanner. Maybe in the near future.... Try to listen to the FTC system near the airport. It's in the OK County database and its all APCO-25.
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