Delayed audio

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scanner404

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I was listening to my scanner live during a fire call and for some reason I could hear the firefighters talking on my scanner before the audio hit their personal radios with about a 2 second delay. The fire dept was Lost Acres (33.94) which is not repeated as far as I know except for dispatch. I was just wondering why this would happen.
 

N1GTL

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I'm not sure where Lost Acres is but if they are on low band, they may be running Pyramid type repeaters in their trucks to rebroadcast to UHF portables.
 

scanner404

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The 158.82 is only used as a fire ground frequency for the East Granby fire department which is also dispatched from Granby, however I don't believe it's a crosspatch since dispatch never transmits on it. Lost Acres (Granby Fire) will sometimes use the statewide fire frequency 33.78 as a back-up channel, but I was scanning that along with the 158.82 and didn't hear anything on those frequencies. If they did use a vehicle repeater in their trucks, wouldn't that use a separate transmit frequency? If so, I don't see that listed anywhere on RR.
 

ko6jw_2

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The description sounds like a simplex repeater. This is basically a device that receives and records a transmission and then repeats it on the same frequency. In other words, a transmission from an HT could be received in a vehicle and then rebroadcast by the higher power radio in the vehicle. I'm not familiar with the location or the frequencies in use, but this sounds like a plausible explanation of what was heard. Such devices are much cheaper than vehicle extenders.
 

cg

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Almost positive the Granby (Lost Acres FD) low band frequency is a simplex system. I don't know who else you were monitoring, but I have never heard what you are describing. Scanner and pager traffic have always been matched the same.

I do hear some delay with Simsbury's base using 33.94 and their UHF repeater not in sync. Much less than 2 seconds but enough where you get an echo sound. It is the delay of sending the UHF signal to whatever repeater is selected.

chris
 

scanner404

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The description sounds like a simplex repeater. This is basically a device that receives and records a transmission and then repeats it on the same frequency. In other words, a transmission from an HT could be received in a vehicle and then rebroadcast by the higher power radio in the vehicle. I'm not familiar with the location or the frequencies in use, but this sounds like a plausible explanation of what was heard. Such devices are much cheaper than vehicle extenders.
Yes I'm thinking that it was a either simplex repeater or some kind of recording/playback device. The sound was coming from the fire truck I believe.
 
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