[NLRS] 915 MHz ISM Band and Digital Modes

[Doug Reed]

A previous revision to the Minnesota Repeater Council 902MHz band
plan was about 10 years ago  when I suggested allowing repeater
offsets of 17MHz, 21MHz, and 25MHz by keeping the output frequencies
the same but allow multiple input splits. In the history of FM on
902MHz, some of the oldest rigs used 17MHz split, then Icom(?) had a
generation that used 21MHz split, and now we all use 25MHz split
because that is what the commercial rigs use on 800MHz and 930MHz. The
Duluth repeaters are 25MHz split because they were built to use some
GE radios that were common surplus about 10 years ago. The K0LAV
repeater is the old 17MHz split and he will be updating it to 25MHz
split when he gets the 930MHz transmitter running right.

>From what little reading I did, it sounds like it is common in
California to have 902MHz repeaters on different frequencies they
reuse with different PL tones. Many of the repeaters have multiple
receivers, or sometimes scanning receivers, to listen for adjacent
signals which they then repeat. Kind of a poor man's trunking
system.....

73, Doug Reed, N0NAS.