The Defpom » Saturday 5th Jun 2010, 23:54
That is funny, I get people giving me Cobra 148's to convert from 27 to 26MHz, it almost seems a waste to convert one back !
Basically the NZ mod involves changing a crystal (X3) to drop the radio down by 635KHz (from 11.325MHz to 11.1125MHz) , however, once that crystal has been changed, all you need to do to get 27MHz is pull pin 10 of the PLL low (to 0V), that will shift the radio up by 640KHz (5KHz high from the AU band).
If you want a permanent conversion (as I suspect you would) retune the radios Loop Oscillator adjustments down by 5KHz (L22, L23, L59), if they do not stretch that far, then you may need to solder a small ceramic capacitor across the X3 crystal, probably about 5pF or 10pF (the smaller the better) in order to drop the crystal frequency.
That is unless you happen to have a 11.325MHz crystal laying around, so you can swap it back to original (would still need retuning).
Cheers
Scott
The Defpom