Hi folks,
I finally decided to change X2 crystal (normally 44.563333 MHz). I found a
company that sells the appropriate crystal:
http://www.surplussales.com
They are located in Nebraska and sell on line. They have 44.083333 and
44.125 MHz crystals, both suitable for 144.390 MHz modification (after step
modification with X1, of course). Each crystal is $ 4.00 US.

Hope this could help.

Daniel VE2BAP


"tirebouchon69" wrote in message
...
Hi,
I want to modify an old ICOM IC-22s vhf radio for APRS at 144.390 MHz. I
already made the 10 KHz step modification, and now I need to make it cover
the lower part of the band, and this is where I get a problem:

If I set binary code "0" on diode matrix, I should get 144.390 MHz
exactly,
but the VCO doesn't work at this low frequency (even if indector vco is
re-tuned). I see 2 possibilities:

1- Change X2 crystal 44.56333 MHz for a lower crystal. For exemple, a
44.250 MHz would make the rig start at 143.450 MHz, and binary code "94"
would generate 144.390 APRS frequency. Any crystal between 44.0 & 44.5
MHz
would be fine. Where could I find such a crystal? (Digi-Key has nothing
around 44.0 to 44.5 MHz Xtals)