On my side of the border we can't use below 440 because you guys have something on primary military or LEO , we use 6.125 for a lot of simplex and I have an openspot on 6.175 but you definitely are not hearing from my equipment and I don't hear the signal you are referring to on this side of the lake .
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I'm assuming you are in the US, in the border zone, that being said, there is very little for LMR between 430-440MHz, however between 403-430MHz in Canada is filled with typical LMR users. Commercial, SCADA, and public safety.
There is LMR users below 430MHz in the US along the border zone, where US hams are not allowed to use 420-430MHz.
RTK users in Canada are typically assigned about(on a mobile device and can't check TAFL for the bottom and top channels)16 channels with an 8 block between 440.0000-440.6000MHz and an 8 channel block between 445.0000-445.6000MHz. All these users that I have found are 25KHz channels and usually licensed Canada wide. The 430-450MHz band, in Canada, is assigned as primary for Geolocation (RTK ect.) and Amateur as secondary users.
You will find some companies that will operate on unlicensed channels anywhere between 430.0000-470.000MHz.(older Pacific Crest PDL radios come in 2 splits, 430-450MHz and 450-470MHz) the new Pacific Crest Vantage ADL radios come in a 403-473MHz band split).
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