Danny6569
Member
Anyone hear the state police on spen 3 lately ? i listened to them this past sunday night around 2 am and they were using analog encryption on spen-3 anyone else hear it yet ?
Encryption on spen 3
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Yep I heard it a few times down this way. Sounds like Voice inversion - Wikipedia, the free encyclopedia to me.
I doubt it was NJSP. They wouldn't be using voice inversion. That technology is about 40 years old.
SPEN does not use CTCSS or encryption, both would defeat its purpose. I have no doubt you're hearing out of state signals, our summertime coastal ducting (tropo) is famous. BTW, voice inversion hasn't been used in decades while encrypted P25 sounds quite similar on a digital voice equipped receiver.
Danny6569
Member
Danny6569
Member
Njsp
They do use ctcss, and i hear what youre saying about the summertime stuff but its been doing it a lot and steady also when it does it! i will listen for more in the future to see if it keeps up
154.680 SPEN 1 – Statewide Calling 131.8
Tone/NAC
155.475 SPEN 2 – National Calling Tx 131.8/Rec 131.8 or CSQ
154.725 SPEN 3 – Car to Car, Secondary ops 131.8
153.785 SPEN 4 – Fire/EMS/OEM/Mutual Aid Tx 131.8/Rec 131.8 or CSQ
They do use ctcss, and i hear what youre saying about the summertime stuff but its been doing it a lot and steady also when it does it! i will listen for more in the future to see if it keeps up
154.680 SPEN 1 – Statewide Calling 131.8
Tone/NAC
155.475 SPEN 2 – National Calling Tx 131.8/Rec 131.8 or CSQ
154.725 SPEN 3 – Car to Car, Secondary ops 131.8
153.785 SPEN 4 – Fire/EMS/OEM/Mutual Aid Tx 131.8/Rec 131.8 or CSQ
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Eh, perhaps I'm more than a little behind the times, CTCSS is news to me. Anyway, there's nothing preventing a distant station from using the same tone and VHF is a crowded house. Oh it'll keep up alright, summer isn't over yet and ducting in the early morning hours is nearly an everyday occurrence here.
Danny6569
Member
Njsp
Gotcha kb, i dont know whats going on but im gonna keep listening and see if i still hear it for a while, ill post later on in the year if i hear it anymore.
Gotcha kb, i dont know whats going on but im gonna keep listening and see if i still hear it for a while, ill post later on in the year if i hear it anymore.
Fredericksburg (VA) Police use voice inversion on 154.7250 [131.8]. I bet that's what you're hearing.
Dave
Dave
Danny6569
Member
Njsp
Maybe lol, im sure the state police here use digital encryption so i dont think they woul;d be using the older stuff ? but who knows i guess time will tell.
Maybe lol, im sure the state police here use digital encryption so i dont think they woul;d be using the older stuff ? but who knows i guess time will tell.
Danny6569
Member
Njsp
I have a descrambler, maybe i should hook it up and listen to what there saying ? guess thats one way to find out!
I have a descrambler, maybe i should hook it up and listen to what there saying ? guess thats one way to find out!
902
Member
SPEN 1 and SPEN 3 do use CTCSS. SPEN 2 is a national frequency and does not currently use CTCSS, although there is a movement in NPSTC to use 156.7 Hz nationally (the same tone as 8TAC90, etc.). SPEN 4 was intended to not have a tone, but with so many people having their hands in programming and no real official direction over the years, slowly moved from being completely being carrier squelch to having a transmit tone and quite possibly a receive tone in some radio fleets. Encryption? Why not? Every department has its own equipment, is programmed by one shop or another, and it seems that compliance with the now very old plan is more like herding cats... unless the interoperability committee is reining things in.
jaymatt1978
Member
Well which is it speech inversion or encryption? Encrypting is very expensive and I believe the state has the authority over the SPEN channels meaning no single department can go digital, let alone encrypted without the state;s premission.
Thanks!! WOW
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