Help decoding a signal

[millam]

I have seen this for years and always wondered what type of signal and its purpose is.
I can copy HF RTTY using FLDIGI but I want to decode this if I can get the right inputs.
Any thoughts?

 

[dlwtrunked]

I have seen this for years and always wondered what type of signal and its purpose is.
I can copy HF RTTY using FLDIGI but I want to decode this if I can get the right inputs.
Any thoughts?

Without knowing where you are or an audio file, we have no idea what this is and thus not able to help. Howerever, FLDIGI is generally useless for commercial VHF/UHF modes. Assuming you are in the U.S., that frequency might be paging or might even be trunking. In those cases, PDW or Unitrunker or DSD+ might help. But again, give an audio sample and we could more likely help (and we might even be able to decode that to be certain)--a waterfall display is of very limited help.

 

[millam]

Southeast Alabama, FCC has listings for 152.24 in east central Alabama with 400+ watts and north
Georgia has lots of listings. I figured it was paging but have not tried PDW. PDW works on the paging
up on 900 megs, I'll try it on vhf, thanks.

Mil

 

[noamlivne]

Looks very much like POCSAG that PDW can decode.
My country (Israel) also has POCSAG at that same freq. PDW works well on it, if the signal is strong(er).

 

[millam]

Yep, PDW says it is POSCAG 512, looks encrypted or weak signal, thanks.

Mil

 

[noamlivne]

Hopefully you can get a stronger signal, perhaps with changing or moving the antenna.
I would guess that POCSAG in the range of 152MHz+- in the States (at least in WA) is for Fire and EMS (unencrypted) messages.

 

[millam]

Hopefully you can get a stronger signal, perhaps with changing or moving the antenna.
I would guess that POCSAG in the range of 152MHz+- in the States (at least in WA) is for Fire and EMS (unencrypted) messages.

Its a hospital, don't really want to listen, just looking for signals that I have not seen before and figure
out who, what and where. Retired and bored, nothing on TV that I want to watch.

Mil

 

[dlwtrunked]

Yep, PDW says it is POSCAG 512, looks encrypted or weak signal, thanks.

Mil

I have only rarely seen possible *encrypted* paging and would tend to suspect it is not encrypted. But some paging is specialized and hard to determine what it is. A lot of POCSAG paging stations also use FLEX on the same frequency (which PDW will also do).

 

[dlwtrunked]

Its a hospital, don't really want to listen, just looking for signals that I have not seen before and figure
out who, what and where. Retired and bored, nothing on TV that I want to watch.

Mil

If you have not done so already, using Unitrunker or DSD+ can be interesting to looking at trunking control channels. You did not say if you are using an SDR or what receiver. Some other possibilities are water/electric meters, home weather stations, satellites, and the list goes on. I am also retired and cannot catch up on the signals I watch or want to look at.

 

[millam]

Yea, D I have been a listener for a long time, started with a Bearcat 1, 8 crystals. Bought a rtlsdr years ago, tried the first DSD on
a linux laptop, to complicated. Watched DSD, DSDPlus, Unitrunker, HDSDR and SDR# evolve over the years. Today I have 4 Airspy's and a bunch
of rtlsdrs laying around. I've got 5 hooked up now, Unitrunker looking at 5 Moto systems. Like you say there is a lot to look at, my next adventure is above 1500 megs, never worked up there before. Just thought, I bought a Whistler TX-2, not my cup of tea as they say.

Mil

 

[dlwtrunked]

Yea, D I have been a listener for a long time, started with a Bearcat 1, 8 crystals. Bought a rtlsdr years ago, tried the first DSD on
a linux laptop, to complicated. Watched DSD, DSDPlus, Unitrunker, HDSDR and SDR# evolve over the years. Today I have 4 Airspy's and a bunch
of rtlsdrs laying around. I've got 5 hooked up now, Unitrunker looking at 5 Moto systems. Like you say there is a lot to look at, my next adventure is above 1500 megs, never worked up there before. Just thought, I bought a Whistler TX-2, not my cup of tea as they say.
Mil

I have 8 AirSpy's here (includes 2 HF+ Discover) and lots of other SDR. I do look at INMARSAT at 1.5 GHz among other things. Mostly into analyzing systems and signals. I use also a HackRF1 to look at higher frequency stuff like radars with a laptop when mobile.

 

[millam]

D thought you might help me with this one. Not close and only see it when skip is running.
I am in SE Alabama so it might be in Fla, Ga or Al. 153.77 DSD doesn't know what it is. I am
gonna see if I can record it using SDR# or HDSDR and figure it out, bored again. I think I
saw it in the FCC database gonna look again.

Mil

 

[krokus]

D thought you might help me with this one. Not close and only see it when skip is running.
I am in SE Alabama so it might be in Fla, Ga or Al. 153.77 DSD doesn't know what it is. I am
gonna see if I can record it using SDR# or HDSDR and figure it out, bored again. I think I
saw it in the FCC database gonna look again.

Mil

153.77 is a common public safety freq, often a fire dept.

 

[millam]

Yea krokus figured as much after FCC search.

Mil

 

[millam]

Whats the attachment file size here? Whats the name of a web site where I can put a big file for
yall to see? Can't bring it up out of the cobb webs this morning. Another cup of coffee maybe.

Mil

 

[slicerwizard]

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[millam]

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sendspace | Delete File
Thanks S, I put a zip file of a freq that a fire dept uses (I think). I recorded it with SDR#.

Mil

Oops wrong!!

 

[AM909]

sendspace | Delete File
Thanks S, I put a zip file of a freq that a fire dept uses (I think). I recorded it with SDR#.

Mil

Oops wrong!!

That's a link to delete the file.