25-77 set
This is what I know... which may be very little.. but I certainly have a few nights carrying around both the 25 and 77 set man pack boat anchors...
I always knew the PRC 25 set was an older version, and the ANPRC 77 set was newer. It was reported to have had updated electronics, and a breather mounted on the battery cover. Other than looking at the tag where the serial number was (which stated 25 or 77 set) the breather was a sign of the .... 77 set.
For the RRB function, in a vehicle, the dual installation system either 2x 524s or 2x841s (77s in trays) you needed a thing called a 2299 box which, when engaged on RRB allowed the radio net to be rebrodcast.
That was a couple of years back so I may be a little rusty on some of the more complex terms like RT841/77PRC etc but I will never forget that radio.....
I'll see if I can dig up some pictures....
For all its worth
Craig Tanner
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