OK guys. Here is what I have.
Two 22 channel FRS radios.
Midland Extra Talk #GXT710
Baofeng # F22
I was trying to use all four radios (two to a set) on Ch 1. No privacy tones, all on high power.
The Baofengs would communicate to one another.
The Midlands would communicate to one another.
The radios would NOT communicate between brands.
User manuals have the exact same frequency listing for each of the 22 channels.
So I played with the radios. Kept the Midlands on Ch 1. Changed every channel on the Baofengs, one channel at a time, until the radios communicated between themselves. Turns out, Ch 15 on the Baofengs is the same as Ch 1 on the Midlands. Even though the frequency chart says different.
Here is where you ya'll are going to say "you can't test that way". But I did. I took my 396xt and put it into Close Call Mode. Transmitted on each radio.....on channels 1 and 15. I will not show what the chart says because you all already know which channel is which. Here is what showed on the 396xt screen each time I pressed the PTT button on each radio....
Baofeng Ch 1 462.5625 Ch 15 462.550 ---- Exactly what the chart says it should be.
Midland Ch 1 462.550 Ch 15 462.5375 ---- NOT what the chart says it should be. 462.5375 isn't even a FRS assigned channel???
As you can see, that is why the radios communicate perfectly when the Midlands are set to Ch 1 and the Baofengs are set to Ch 15. I am guessing there was improper data entry at the Midland factory.