Due to the fact we are limited to 50 watts of power, the small mobile duplexers that are typically rated for 40 watts would do a fine job and they are inexpensive on the used market. But I don't see how not needing a duplexer is that big of a deal on a fixed repeater. Now mind you, I am a commercial radio tech. Motorola will work with Motorola, Kenwood with Kenwood. Meaning that you can only have a single talk path when operating like this and this mode will require everything to be brand specific. I do expect that to happen sooner or later, likely much later. So until the FCC changes the rules we won't have DMR on GMRS. This means almost anybody could setup a repeater with far less technical expertise required and cost for a decent set of BPBR filters. Of course you have to find one that works.Īnyway the attraction is no requirement for using any kind of "cavity" filters which would be necessary on a more traditional in-band system. What would intrigues me about DMR are some of the radios that will function in SFR, single frequency repeater, mode.
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