GI 475.xxxx range police freqs?

[weirdal]

I can't find any information on these frequencies in Grand Island. they seem to be police, though some a lot more active than others:
475.2500 - very active
475.1000 - not very active
475.0750 - not very active
475.6250 - fairly active, seem like it's more "non-professional" police talk
475.2000 - not very active

can anyone give me any information on these frequencies? there are probably more in that range but that's all I have found that are active.
I can't find them listed anywhere. I'm hoping someone in/arround grand island can shed some light on these.
thanks.

 

[Gilligan]

475.2500 - very active
475.1000 - not very active
475.0750 - not very active
475.6250 - fairly active, seem like it's more "non-professional" police talk
475.2000 - not very active

I did some quick math on a hunch and I think you're receiving images of your local police and sheriff frequencies. If your scanner has an IF crystal of 10.8 (very common), you will receive images of strong frequencies at twice the IF added on (10.8 x 2 = 21.6). Check this out:

475.075 + 21.6 = 453.475 Hall County Fire/EMS
475.100 + 21.6 = 453.500 Hall County Administration
475.200 + 21.6 = 453.600 Hall County Sheriff Dispatch
475.250 + 21.6 = 453.650 Grand Island PD Dispatch
475.625 + 21.6 = 454.025 licensed to KNKL212 in Grand Island (business freq)

If you can detect PL/DPL tones w/ your scanner, compare them to these listed frequencies. Or just listen to both these 475 freqs along with the listed ones and see if they are the same. I'm willing to bet this is what you are hearing. Gilligan

 

[weirdal]

thanks. you are absolutely right.

I wonder why I'm hearing police chatter on that last frequency though

 

[Gilligan]

Are you familiar with LTR systems? I live in Oklahoma City and we have an LTR user w/ 6 freqs (5 in 461-465 and 1 in 454). The 454 freq is not correctly licensed. You can tell LTR by the data burst every 10 seconds or LTR Passport (not scannable) every 3-4 seconds.

I would also be willing to bet that it may be private security that you are hearing. They often use 10-codes and sound a lot like police. Listen for property names (like apartment complexes and businesses) to see if they are patrolling properties and you'll know if it's them. They can be a lot of fun to monitor. Otherwise, maybe your police department has a new chatter channel in the 454 range. This is not very likely though, as it is not in the government range. Let me know what you hear. Now you have me curious.

 

[weirdal]

Are you familiar with LTR systems? I live in Oklahoma City and we have an LTR user w/ 6 freqs (5 in 461-465 and 1 in 454). The 454 freq is not correctly licensed. You can tell LTR by the data burst every 10 seconds or LTR Passport (not scannable) every 3-4 seconds.

I would also be willing to bet that it may be private security that you are hearing. They often use 10-codes and sound a lot like police. Listen for property names (like apartment complexes and businesses) to see if they are patrolling properties and you'll know if it's them. They can be a lot of fun to monitor. Otherwise, maybe your police department has a new chatter channel in the 454 range. This is not very likely though, as it is not in the government range. Let me know what you hear. Now you have me curious.

sorry, not familiar with LTR systems.

It could very well be a security though. I haven't paid much attention to it to notice any locations mentioned. I know I've never heard any dispatch on it though, which supports that idea.
I'll set it to record any activity on that channel though and post back here tomorrow evening.

Shouldn't they be licensed though?

 

[Gilligan]

Shouldn't they be licensed though?

I almost have to laugh. Unfortunately not everyone bothers to care about licensing with the FCC. Even some of the large radio system providers (LTR...) that make a living selling radio time to businesses. It's hard enough trying to identify the users on an LTR trunked system -- now trying to figure out the frequencies when they are unlicensed makes it even more fun...or trouble...however you look at it.