Strange signal on Hearne PD

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mfn002

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A few days ago, I picked up some sort of digital signal on Hearne PD (156.240). It sounded sort of like a trunked system data channel and seemed to use a PL tone of 141.3. It had a "GAAAR-BEEP" sort of sound and stopped and started as if someone was transmitting something. I've never heard anything like this before. Does anyone know what this might be?
 

mfn002

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Oh, I didn't realize that. I probably would of if I had heard my typical band opening indicators, Houston Police and Houston Fire.
 

Markef

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Robertson County SO and Hearne PD are now P25 digital. What you heard is the digital noise that is made when transmitting . This is not a ttunked system controller. Robertson County is updated on this site.
 

mfn002

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Robertson County SO and Hearne PD are now P25 digital. What you heard is the digital noise that is made when transmitting . This is not a ttunked system controller. Robertson County is updated on this site.
I knew that. However, P25 traffic wouldn't be caught by my scanner due to the PL tone being there. I would have to deactivate the PL in order for such traffic to come through, and, even then, my scanner would have automatically decoded it.
 

bwillcox

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VHF propagation was quite good the evening and morning after the tornadic storms came through the D/FW area so there is no telling where the signal you heard came from.

I was hearing traffic on an amateur repeater in Buffalo Tx nearly full scale here while mobile Wednesday morning.

-b-
 

mfn002

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That reminds me of one such event that happened sometime last year. I recall that every NOAA Weather Radio channel I picked had a station on it. The farthest south? Brownsville. If memory serves me correctly, I also picked up Junction, Corsicana, and Midland among others. I also recall getting several different DPS stations as well. Some were so clear that it was as if the repeater were right next to my house. The clearest, if I recall correctly, was DPS Corpus Christi. I've heard several of these band openings over the years, the earliest I recall was in the days before I had a scanner and was playing around with a Wether Radio. That time, the farthest west I got was El Paso and the farthest north was Waco.
 
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The only thing I can think of would be OTAR - anything else wouldn't carry a PL - but what you're describing sounds like analog encryption. Either way, I'm with the group on it being skip, either direct to your radio or through the Hearne PD repeater.

edit: Listen to the samples for OTAR and DES encryption on this page: http://www.kb9ukd.com/digital/
 
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mfn002

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The only thing I can think of would be OTAR - anything else wouldn't carry a PL - but what you're describing sounds like analog encryption. Either way, I'm with the group on it being skip, either direct to your radio or through the Hearne PD repeater.

edit: Listen to the samples for OTAR and DES encryption on this page: Digital Modes Samples
I guess you're probably right about that, except that I rarely pick up Hearne PD or anything else in Robertson County for some strange reason.
 
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