Having interference problem around 859 mhz

[mk262]

So I follow a trunked system. I've noticed, whenever the active voice channel is in any of the marked frequencies, I get interference:

854.3625 clear
855.4625 clear
856.2625 clear
856.4875 clear
856.9375 clear
856.9875 clear
857.4875 clear
857.7625 clear
858.2625 clear
858.4875 clear
858.7375 iffy
859.2625 bad
859.7125 bad
859.7625 bad
860.4875 bad
860.7375 bad

Here's a little history. I've had three scanners, pro-97, pro-197, pro-106, four different antennas. I'm currently on a sdr setup with a scantenna st-2 antenna and new low loss rg6 coax.

No matter what device, antenna or cabling I've used, I can't seem to make it go away. I live in a gated subdivision and don't have any radio towers especially close.

Can someone please give me some direction on what I might try to resolve this? I'd be so appreciative.

 

[W8RMH]

Probably cell phone tower interference, nothing you can do. I have similar issues in many areas.

 

[n4yek]

That is why there is a big reband taking place for public safety, they were have interference issues also.
Something to try though, have your scanner run off battery power and kill the power to your house.
If the interference goes away then you have an internal item causing your problem.
If you still have the interference, then you have at least eliminated everything from your house.

 

[mk262]

That is why there is a big reband taking place for public safety, they were have interference issues also.
Something to try though, have your scanner run off battery power and kill the power to your house.
If the interference goes away then you have an internal item causing your problem.
If you still have the interference, then you have at least eliminated everything from your house.

I've tried scanners on batteries and sdr on my unplugged laptop, no diff.

 

[737mech]

I might be a small change in the system? Can you check all the cc's and sites, go back over the bandplan and make sure it's correct? What kind of noise? Maybe it's multisite simulcast issue? Try cutting out all the freqs you can and use CC only. I had a problem similiar to this where one of my cc's was programmed into two trunked systems by mistake. One digit off can make a problem, if you haven't already go look over all your trunked systems cc's.

 

[n4yek]

I've tried scanners on batteries and sdr on my unplugged laptop, no diff.

That still doesn't eliminate household items, that is why I stated to shut the power off to your house.
You would be surprised at how much interference can come from these new LCD / Plasma TV's. Even touch lamps give off tremendous RF interference.