Picked up this on 351.0500 NFM

[cjrjr507]

Hi
I picked up a strange signal on 351.0500 mhz NFM while searching and the signal was a constant beeping and I could here a dog barking in the backgroud. Had to be some kind of alarm system. The signal lasted for awhile then eventually faded out. Skip maybe ? Heard it between 1830 - 1900 pm on 1-24-09 I live in Libby, MT. Did anyone else hear this ?

Scanner: BCT15
Antenna: Firestik Base Ant.
Preamp: GRE super amplifier +20 db

 

[cjrjr507]

Signal moved to 351.1000

Hi
Me again, found the same signal on 351.1000 NFM and I don't think it's skip. It has to be local around here somewhere and no dog barking this time. Alarm system ?

 

[mancow]

Crappy baby monitor image perhaps?

49 or 900 Mhz range?

 

[joe_disco_electronics]

Perhaps the beeping is a UFO and a dog was barking at it?
After they changed frequency, they must have killed the dog.

 

[cjrjr507]

This is weird, the signal is still there but very weak and can only here it with my preamp set to +20 db and it's shifting in frequency (raising) like slow doppler shift. first picked it up at 351.0500 now it's at 351.3500. shifting to 351.3562 6.25 khz steps can just barely hear it on 351.3500 now. Slowly shifting to 351.3625 and going up, hmmm

 

[cjrjr507]

Just checked for the signal and it's gone. hmmmm Maybe it was skip or whatever it was.

 

[joe_disco_electronics]

Just checked for the signal and it's gone. hmmmm Maybe it was skip or whatever it was.

All kidding aside, very interesting catch. Keep us posted if you hear it again or discover the source. The frequency shift was unusual.

 

[cjrjr507]

Well when I went to work I took my scanner with me and the signal is definately coming from the neighbourhood somewhere. Not a satellite. It has to be an alarm system of some kind I would say. And the frequency has stabalized at 350.3625 so I think the freq drifts some when the system is cold at night.
And have not heard the dog in the background. got the radio set to 12.5 khz step. Just a constant beep beep beep. Maybe it's a car alarm or house alarm system or something else. whatever. weird. If I hear something in the background I'll let you guys know, besides the mutt. Ha

 

[cjrjr507]

Hi
Well the signal is still there and it is starting to drift up in freq so the system must be getting cold. The dog is back barking in the background, woof woof. So it's an wireless alarm system with a sonic transducer I'd say. Or it could be a baby room monitor as one person stated but I don't think so as it sounds like whatever it is, it's outside in the cold. Cool, I hope it goes off, and I hear burglar, ha ha ha.

 

[joe_disco_electronics]

Take a walk through the 'hood to find the barking dog.

 

[cjrjr507]

Found the source of the signal

Take a walk through the 'hood to find the barking dog.

Hi
Found the source of the signal. It's comeing from the backyard area of the house across the street from me. Must be a security system back there. As they have a dog back there. I thought that dog sounded familiar.
Woof woof. Or the system is in that area on some property close by. Real close. Did not see the unit but it's somewhere around there.

 

[kb2vxa]

"The signal lasted for awhile then eventually faded out."

I was thinking "satellite" considering the fade in fade out nature of the signal and the Doppler shift and I was right, the allocation chart shows 335.4-399.9 as mobile/mobile satellite/fixed but I can't explain the dog, Laika was up there in 1957 but died in orbit at the end of the mission.

Now if you're hearing something actually broadcasting a dog there is another explanation, there's an improperly operating device somewhere around and you're picking up a harmonic or other spurious radiation from it. That would also explain the instability, spurs often drift frequency and are erratic in nature fading in and out. I'll bet you cops to donuts you'll find the main signal in one of the usual spots a baby monitor or an alarm with sound monitoring capability transmits on and the dog is triggering a motion sensor. Just because the panel is off doesn't say the remote sensors are inactive, just being ignored.