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
73's de Scott N5JLQ @ K6IYK....RELAYED BY WB0SEN & N0KGX
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