RE: new 2-way radio doesnt work with old radios?
My REAL OLD motorolas work with my new ones fine...little lacking in clarity though.
I think you have some from back then that have channels, probably 12but up to 22, withoutany private sub-codes. You could also be running in GMRS format while your others are only FRS models, but I doubt that's the case. Do what Andy mentioned and try the channel on one while going thru the same channel and codes on the newer one until you getthe clearest connection. Try them all, whether it's thru 12 or 121.
To my fellow Cheesehead in Neillsville, I don't know about you, but I can't get jack for signal where I go with my Nextel phone once I get 3 miles off the freeway or away from a cell tower anywhere past Tomah heading west. My boss has a cabin up in Laona and another co-worker is up in Presque Isle....All no go.
I know, get different service? They pay the bill and supply the phone.