Keep in mind this repeater can only operate on ONE of the GMRS repeater channels at a time This is due to the notch duplexer. It can ONLY be tuned for one TX and one TX frequency at a time. If you need to change the repeater channel the notch duplexer must be retuned. That requires equipment most people don’t have or a trip to the local commercial radio shop.
axorlov is correct, you could do that with a human dispatcher that relays/echos the messages. That human effort and associated echo would certainly get old.
If you desire a duplex repeater setup you have several options.
First option is to purchase a purpose-built repeater, perhaps an all-in-one unit. There is an affordable fixed purpose unit like that sold right here on the myGMRS site ideal for just the scenario you describe. There are also higher priced commercial units available.
Second option is purchase a pair of standard mobile radios, plus duplexer, antenna and controller and assemble one yourself. If you consider this option, the Wouxun KG-1000G has features that simplify this a tad over say a pair of MXT-400. The beauty of this arrangement is then have the option to use the component radios independently when repeater operation is not required.
Third option is doing the same as above but instead some HTs. Some of have done this. I suspect you will find this works but will have the lowest performance of all your options. Plus your talk time will be limited.
The beauty of the all-in one is that you could you can perhaps hoist the repeater and antenna high into a tree (or use a push-up mast you take with you) to get some serious elevation. Elevation pays more in range dividends than any legal GMRS power will practically get you.
