Lancaster Co, EOC Siren Freqs

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melona380

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Hey all,

Does anyone happen to know what freq the EOC uses in Lancaster county for civil defense siren activation? Any chance EOC has a POCSAG system also?

PS. any cool simplex stuff out and about.

Cheers
KE0EWO
 

cellphone

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It's been about 14 years since I lived in Lincoln. When I was there, I think they used 155.250 to trigger sirens. I believe this was also used for EOC voice paging and a voice frequency.


I don't recall if they used POCSAG back then.
 

melona380

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It's been about 14 years since I lived in Lincoln. When I was there, I think they used 155.250 to trigger sirens. I believe this was also used for EOC voice paging and a voice frequency.


I don't recall if they used POCSAG back then.
Thank you, Will update if i find anything
 

melona380

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@cellphone, 155.250 is indeed what they use... I have attached 2 files data is what I think is a AFSK Signal used for activation. Could anyone verify that this is an AFSK signal? I can provide IQ if anyone wants it
 

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PVPD730

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@cellphone, 155.250 is indeed what they use... I have attached 2 files data is what I think is a AFSK Signal used for activation. Could anyone verify that this is an AFSK signal? I can provide IQ if anyone wants it
[/QUOTE]

Those tones are proprietary to federal signal. Essentially it's an encrypted AFSK data burst used to remotely activate/monitor the siren systems. ATI has something similar for their siren equipment.
 

cellphone

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Those tones are proprietary to federal signal. Essentially it's an encrypted AFSK data burst used to remotely activate/monitor the siren systems. ATI has something similar for their siren equipment.

They have obviously made some changes since I lived there. They were tone activated in the past.
 

elephant101

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Not to get too far off subject; when I lived in Norfolk, their sirens were activated on 39.940 with DTMF tones. Anyone know if they still use that frequency to trigger the sirens?
 
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