From: mikey@slic.cts.com (Mike Shirley)

Icom IC22S.MOD        Packet Modification

The Icom IC22S is a ten watt diode matrix PLL synthesized 2 meter rig
manufactured in the early 1970's.  In it's stock condition it tunes 146-148
MHz in 15 KHz steps.  Since I am sure there are a few of these sitting on
shelves collecting dust due to the limited tuning range, why not modify them
for the perfect packet rig.

First replace the 7.68 MHz Oscillator/Divider crystal (X1) with a 5.12 MHz
crystal.  This will move the band to 145.00- 146.94 MHz in 10 KHz increments. 
The repeater offset will now be 400 KHz which should not pose a problem in
simplex packet operation.  I will give the diode matrix settings for the most
commonly used packet frequencies.  You can formulate others as needed using
the formula N=100*(f-145)+61 and the manual.  The diode positions indicated
ARE WHERE DIODES ARE PRESENT.  The other positions are left empty.

  145.01= D5,D4,D3,D2,D1
  145.03= D6
  145.05= D6,D1
  145.07= D6,D2
  145.09= D6,D2,D1