Originally Posted by james812
I've been listening to a few of these UHF remote links lately and they seem to just be a low power simulcast.
Can anyone give me some insight to what they are used for? There has be be a reason.
What UHF links are you monitoring? I mean, what state and area in the state?
Have a link to the page here that shows these links you speak of?
There are thousands of UHF links in use across the country. That makes it rather hard for someone who may know the answer to give you an answer if they don't know what links you are talking about.
A little more detail would be most helpful!
In general, links are used for a variety of reasons but many times they may be used to link multiple receive sites to one control location. That is but just one example as there are many uses for them.
If you are lucky and in the path of one, sometimes you can receive from the link and actually hear traffic that may otherwise be out of range.
Many use pretty narrow beamwidths though so they can be hard to hear if you are not very close to the signal path.
Programs like Trunker or any of the modern day control channel decoding applications are just as useful on a VHF trunked analog or digital radio system as they are when used on an 800 MHz system. A lot of info can be learned from decoding the datastream from a P25 system.
So yes, they are very useful for VHF control channel decoding. Many associate those type programs with 800 MHz systems as that is where most of the first trunked systems were setup at. Now, you can find trunked system all over the typical scanner bands. Low VHF may be the exception. I've not heard of any low band trunked systems. I'd bet there is one out there somewhere though. Not sure how well it would work with the way propagation changes so much on that band and the potential for interference in the band.
I know there are telemetry signals on low band as well as scada data but can't say I've ever heard any analog or digital trunked control channel type sounds on low band.