I just took apart an old motorola talkabout FRS radio that i've had for a while. I have a pair of them I use for hunting...they cost I think 25 bucks in the store.
Anyway, I took them all apart. There are four torx bit screws that hold the circuit board together. On the pager button there are two traces. There is a carbon pad on the membrane that completes this circuit. What I did was use some very fine wire and solder it on the traces (actually, one trace and I tracked where the other trace went and found a nice pad to solder to).
Anyway, now I've got two wires coming out of my frs radio. When I short them, it pages the other radio. So, now I have to make up a small momentary microswitch in which when you pull the pin (when the flag pops), it shorts the wires and pages the other radio.
No more sitting in the windowless shanty wondering if I have a flag.
The best part is I can pick one of 14 channels, and get more radios when I am fishing with friends or something.
