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Jacko mods for super super etc ta!

cqradio

Member
Feb 24, 2013
2
0
11
Hi Folks!
I’m looking for a way to modify my 5 band classic Jackson to cover as much of the 10 meter band as possible. I know there are a number of ways to go about this depending upon amongst other things the desired outcome so I’ll start there.
I’m not bothered about the alpha channel skips or the channel 23 anomaly and in any case I would like to retain 40 correctly numbered and spaced mid-block CEPT/FCC channels.
I cannot see any value in having a radio that goes below 26.965 and in an ideal world mid-block would be my band ‘A’ and band ‘E’ would run from 28.765 to 29.205.
Of course I’ve trawled the internet and the closest solution I’ve managed to come up with is a modification that will give me 26.515 to 28.750. Not ideal but a movement in the right direction.
The plan goes something like this:
Firstly, shift the wire from band switch position ‘A’ to matrix diode selection ‘B’ then ‘B’ to ‘C’ and so on.
This would free up matrix selection ‘A’ which could be re- configured and connected to switch position ‘E’.
Reconfiguration would amount to pulling low pin 2 of IC6 and pins 4, 2 & 15 of IC7.
Breaking the track to PLL pin 11 with a DPST switch on which 8v could also be introduced, possibly utilising the ‘roger bleep’ switch?
Not the tidiest way of doing it perhaps but would this work? I have no idea really; this is just stuff I have picked out from here and there.
Band ‘’E’ should now be 28.315 to 28.755 but only when the switch is thrown. Bands ‘A’ to ‘D’ will be as normal but one band up without the switch thrown. What the effect would be with the switch in the wrong position I have no idea.
Can anyone help me out and tell me if this is a workable plan or even better show me a more satisfactory modification. Please be aware I am not an engineer and can’t cope with too much jargon, just the nips and tucks please. Thanks all!
 

Robb, he has a 5 band original. He needs to look at cbtricks, secret cb for more channels or buy the service manual like I did.
 
Easiest and probably best way to shunt the radio 900 khz (2 Bands) or more higher would be to increase 14.55Mhz Ref crystal frequency 450 khz higher for each band you want the radio to jump,a 2 band jump (15.45Mhz crystal) would take you from 26.965 - 29.215 with just a retune neccessary.you could go higher and sacrifice the midband and just keep the high cb band for 27.555 with a 15.90 Mhz crystals.

If you have to get crystals made good idea to send the original so maker can copy exact parameters.

You could dick around with the diode matrix too,but is it worth all that grief,sounds to me like its a president lincoln/2830 et al you really want.

Incidentally if your using a 5 band jacko and skips bouncing on 27Mhz quite often the original band A,band B on a six band jacko around 26.285 (ch19) is where the very best and most elusive operators operate,escaping the bellends on 555.
 
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