Ramsey Electronics FX-440 Manual page 29

Using the FX-series FM Transceiver Quick Reference
Programming Guide:
In addition to "pencil & paper math" calculation directions and also a
handy computer BASIC program for programming the FX- series
Transceiver for any frequency and transmit offset within its specified
range, we provide this guide for binary programming of a variety of
popular Repeater frequency pairs as well as some other frequencies of
general interest. ALL binary programming data for 512 through 1
presumes prior diode programming of higher level binary inputs which
remain constant for the 440M Hz amateur radio band:
32K 16K BK 4K
1 0 0 0
You'll notice definite PATTERNS in the standard repeater frequency
assignments and their binary equivalents. Look at these patterns up and
down the programming input rows as well as across for any given
frequency. If your application could use more than the 12 channels easily
programmed for front panel switching, perhaps these patterns will give
you some good ideas for additional channel switching convenience.
FX-440
Ref. 27