The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Hello one and all

I have just got a blast from the past from a car boot sale.
I got a JWR Mk 2 CB, God that takes me back a few years.
But in the day, I had an Icom ICB 1040 CB radio, it had the same bord as the JWR Mk 2.
The guy that I got the Icom off, had done a mod to it to give it 40 more channels.
But the thing was that the channels was set at 5Kc's apart, and not the normal 10Kc's.
I did have the lid off to have a look, and I seem to remember a wire that was hook'd up to one of the pins on the IC.
But I do not know what he did to the rig, or how it was done.
So I would like to know if anyone knows what it is that I am talking about, and how the hell do you do it ???
As long as you do not need a lot of test equipment like a scope, then I think that I might be able to do the job
If any one can tell me what to do, nothing to technical, and photo od drawing would help.
The IC number is: MC145106P
I hope that might help ???

I hope for some good news form one of you very soon

Bye from John

A bit late but I've answered this very same question on another forum.
You need to wire a resistor about 10K to pin 6 of the PLL and put the other end to 0v (GND) through a switch.
The PLL now counts in 5 instead of 10, hence the 40 channels in 5KC steps and not 10KC's but god knows how low it goes in frequency.