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Perhaps I was being too subtle. Let me be a little more direct. It seems to me you spend a lot of time asking others for support in your quest for solutions for problems that do not exist. As to the specific suggestion about a Dual-Mode repeater, exactly what problem are you trying to address? If you are just dreaming of what could be, then as I have tried to tell you at least twice previously, there is already an excellent service for that, amateur radio. Instead of floating ideas you want other's opinions on, take the time to get a study book and take the ham radio technician test. Honestly, it is easy. If you can't grasp the (fairly basic) technological side at first, just study the questions and memorize the answers - believe me, you would not be the first person do do that. The test consists of 35 questions drawn from a pool of 426 questions... and all 426 of them are available online or in print. With a ham ticket (and a little money) in hand, you would be free to start experimenting with some of your ideas.

That's a heck of a lot easier to read than what I wrote! LOL

I will leave this right here http://mwgmrs.com/mygmrs/chart.jpg

Leaving aside the questionable legality of "simplex repeaters" on GMRS, just think a moment about this idea... How can a repeater listen on its own output? Presumable there would need to be two receivers listening to both input and output frequencies and then deciding how to respond based on which receiver picked up the signal. So, how could you ever switch back and forth between the two modes? What if there was one user on "simplex" and another in "repeater" mode, they could never communicate. All of this because someone can't program their radio, or bought the wrong radio. My suggestion is, get a HAM license if you want to experiment. That is exactly what the amateur radio service is for. In the meantime, GMRS was designed for a specific set of use cases, and it seems to do those pretty well. I am not in favor of creating a second "amateur" radio service out of GMRS.

- On channels 1-7, the power is limited to 2 watts under FRS rules and 5 watts under GMRS rules. - On channels 8-14, the maximum power is 500mw, regardless if you are operating under FRS rules or GMRS rules. - On channels 15-22, the power is limited to 2 watts under FRS rules and 50 watts under GMRS rules. If your radio doesn't drop to 500mw ERP, I wouldn't recommend using it on those frequencies. "§95.567 FRS transmit power. Each FRS transmitter type must be designed such that the effective radiated power (ERP) on channels 8 through 14 does not exceed 0.5 Watts and the ERP on channels 1 through 7 and 15 through 22 does not exceed 2.0 Watts." Also... "§95.1767 GMRS transmitting power limits. This section contains transmitting power limits for GMRS stations. The maximum transmitting power depends on which channels are being used and the type of station. (a) 462/467 MHz main channels. The limits in this paragraph apply to stations transmitting on any of the 462 MHz main channels or any of the 467 MHz main channels. Each GMRS transmitter type must be capable of operating within the allowable power range. GMRS licensees are responsible for ensuring that their GMRS stations operate in compliance with these limits. (1) The transmitter output power of mobile, repeater and base stations must not exceed 50 Watts. (2) The transmitter output power of fixed stations must not exceed 15 Watts. ( 3 ) 462 MHz interstitial channels. The effective radiated power (ERP) of mobile, hand-held portable and base stations transmitting on the 462 MHz interstitial channels must not exceed 5 Watts. © 467 MHz interstitial channels. The effective radiated power (ERP) of hand-held portable units transmitting on the 467 MHz interstitial channels must not exceed 0.5 Watt. Each GMRS transmitter type capable of transmitting on these channels must be designed such that the ERP does not exceed 0.5 Watt."

Thanks for all the input. I know it is not legal and there is a Approx. $20,000.00 per day fine and prison time if caught. I was only going to use it to test my MTX400 for range, and maybe for emergency use when stuff hits the fan.I try to stay legal.