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TRS on 820.575?

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theaton

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I'm picking up a Motorola TRS on an odd frequency in Sioux City (IA/NE/SD tri-state area). On some days 820.575 is a control channel and on other days it has analog voice. It is not in the FCC database. The problem is that I can't find anything other frequencies to go along with it. I wonder if there could be something in the 824-849 range that is blocked from my scanner. Any ideas?
 

ecps92

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Your radio is picking up an image

I'm sure someone local could provide more info as to which specific Freq



I'm picking up a Motorola TRS on an odd frequency in Sioux City (IA/NE/SD tri-state area). On some days 820.575 is a control channel and on other days it has analog voice. It is not in the FCC database. The problem is that I can't find anything other frequencies to go along with it. I wonder if there could be something in the 824-849 range that is blocked from my scanner. Any ideas?
 

IAmSixNine

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Correct me if i am wrong but wouldnt that be the input of the repeater. 800mhz uses standard 45mhz offset on the negative side..
So you add 45 to 820 and you get 865.575.
NOW technically nothing should be there because thats in the Nextel Re-banded split. But im just guessing here.
 

theaton

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It must be an image because I can't pick it up on my ham radio. It doesn't seem to match any moto system in the area, and there aren't many to choose from. The signal is incredibly strong. I already checked 865.575 & got nothing--plus that wouldn't explain the days when it's a control channel. Thanks for the ideas. I'll keep searching.
 

obijohn

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It must be an image because I can't pick it up on my ham radio. It doesn't seem to match any moto system in the area, and there aren't many to choose from. The signal is incredibly strong. I already checked 865.575 & got nothing--plus that wouldn't explain the days when it's a control channel. Thanks for the ideas. I'll keep searching.
It would be helpful if you stated what model of Motorola radio you are hearing this on...
As others have stated, it is most likely an image. If we knew the IF frequency, it could be determined
using 2A-B. (or a subset of it)

In the meantime, it is likely the Tri-state p25 system that you are hearing. listen to the control channels, and figure it out!
 

mikewazowski

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Most Motorola radios won't even allow you to enter that frequency in since it's an input frequency.

I didn't see any mention that a Motorola radio was used.
 
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