Amateur Radio - Free and Open Source Software

Number 10 0n your FNdback c.rd
Put Your IC-22S on Packet
Dust it offand dedicate it to 2m packet!
by Michael S. Dooley KE4PC
A
re you tired of lying up your synthesized
radio on packet? If you have access
10 an ICO M IC-22S, a fast and easy fix
will get it on this fasci nating mode.
With the help of the schematic, find the
Reference Oscillator/Divider. This is a 7.68
M Hz crystal. Replace that with a 5.12 MHz
crystal. This lets you rune the 22S in 10 kHz
steps.
The crystal is available through several advertisers
I've seen in computer magazines. as
well as from any of the crysta l manufacture
rs. I got mine from Inte rnational Crystal in
Oklahoma Ci ty . If you order from a manufacturer,
include the load ing ca pacitance. Send
them a copy of the IC-22S schematic, and the
manufacturer will figu re OUI the loading for
you. (1 didn't know what the loading was. and
so asked for a 20 pF one. which works fine.)
Now just follow the Table to configure the
d iodes for rhe packet frequencies on which
you wan! [ 0 operate. That's it!
Drawback?
The only problem is that. with the new
Table of Diode Setting s for the 1C-22S
Frequency 07 06 05 04 03 02
145.00 0 0 1 1 1 1
145.01 0 0 1 1 1 1
145.02 0 0 1 1 1 1
145.03 0 1 0 0 0 0
145.04 0 1 0 0 0 0
145.05 0 1 0 0 0 0
145.06 0 1 0 0 0 0
145.07 0 1 0 0 0 1
145.08 0 1 0 0 0 1
145.09 0 1 0 0 0 1
145. 10 0 1 0 0 0 1
(0 = diode I'IOt insta lled: 1 = diode insta lled)
crystal, the IC-22S works only from j ust below
145 MHz to 146.94 MHz , and the offset
function gives only a definitely non-standa rd
± 400 kHz split. But, what the hec kl-e-this rig
was likely busy taking up space on a shelf,
whi le you were tying up a perfectly good
synthes ized split operation rig on packet. I set
01
o
1
1
o o
1
my channels as 145.01 MHz o n cha nnel one.
145 .02 MHz on channel two . 145.03 o n
channelthree. and soon. Works great! FJJ
The author f1UlJ he reached at 3801 E. 14th
#1401 . Plano TX 75074.
1
o o
1
1
00
1
o
1
o
1
o
1
o
1
o
1
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