If you are still interested I can have a pretty good stab at telling you how this board works. Alternatively, just look at the circuit for the Belcom LS-102L because this uses a virtually identical circuit for PLL control via an optical encoder driving BCD counters and the LED display and the digital selection of the clarifier trimpots. I would strongly suggest that these Jentec boards were derived from the original Belcom circuit.
Looks like the cob1 mod board similar to what`s in the cobra 128 modifications from late 80s to early 90s from the UK... Look for people that have a cobra 148 gtl-dx cob1 jentec and it might match the same PCB modification board.No reason why the cob 1 jentec to MKV mod would not work on the Jackson.Contact cobraworkshopz as they may be able to give you the information on the Var resistor pots on the board. Or just send it to them to get tuned up on the correct test equipment. hope this helps.
Hi, so maybe the mystery is solved? BIG RESPECT and thanks to Sigi for the information. Now need find if there is a manual existed on these to find what the variables are for. THANKS to all those that helped so far.
@vicmeuk What's really funny is someone who would want to convert a good quality 11 meter to also operate on 10 meters..
11 meter band is all but dead in most of the uk and the 10 meter band is never used except for dxing during skip conditions.
I have never seen a 11 meter radio modified to run on the 10 meter band as well as the 11 that worked as well as it did when it was just a 11 meter radio.
Only exception are radios made as 10m/11m sets that just need a jumper removing..
Hi Simon! I know that the modification comes from UK. The extension board was sold there in the late 90s. I have some other pitures here on my PC. I know a man who owend one. I'll look for the pics and send them per email.
@13EL121 Thanks Ralf you are so kind. Am trying to find what the variables are so it can be repaired correctly. Any assistance I thank you very much indeed
Dont bother asking Cobraworxshop about anything radio related as they made a total hash of a radio belonging to me..NEVER AGAIN>>
teamfab 9 months ago
If you are still interested I can have a pretty good stab at telling you how this board works. Alternatively, just look at the circuit for the Belcom LS-102L because this uses a virtually identical circuit for PLL control via an optical encoder driving BCD counters and the LED display and the digital selection of the clarifier trimpots. I would strongly suggest that these Jentec boards were derived from the original Belcom circuit.
G0HZU 9 months ago
Looks like the cob1 mod board similar to what`s in the cobra 128 modifications from late 80s to early 90s from the UK... Look for people that have a cobra 148 gtl-dx cob1 jentec and it might match the same PCB modification board.No reason why the cob 1 jentec to MKV mod would not work on the Jackson.Contact cobraworkshopz as they may be able to give you the information on the Var resistor pots on the board. Or just send it to them to get tuned up on the correct test equipment. hope this helps.
digiglen 1 year ago
Hi, so maybe the mystery is solved? BIG RESPECT and thanks to Sigi for the information. Now need find if there is a manual existed on these to find what the variables are for. THANKS to all those that helped so far.
simonthewizard 1 year ago
cool
bluejay148 1 year ago
There is no reason why the jackson can`t take the 148 modification and nice to see a few of these kicking about. Jackson on 10m hahaha good audio...
vicmeuk 1 year ago
@vicmeuk What's really funny is someone who would want to convert a good quality 11 meter to also operate on 10 meters..
11 meter band is all but dead in most of the uk and the 10 meter band is never used except for dxing during skip conditions.
I have never seen a 11 meter radio modified to run on the 10 meter band as well as the 11 that worked as well as it did when it was just a 11 meter radio.
Only exception are radios made as 10m/11m sets that just need a jumper removing..
26highstreet 1 year ago
Hi Simon! I know that the modification comes from UK. The extension board was sold there in the late 90s. I have some other pitures here on my PC. I know a man who owend one. I'll look for the pics and send them per email.
13EL121 1 year ago
@13EL121 Thanks Ralf you are so kind. Am trying to find what the variables are so it can be repaired correctly. Any assistance I thank you very much indeed
simonthewizard 1 year ago
Simon. this AMD chip is 2732 EPROM, where the all dividers stored, for frequencies. MC14510 and CD4511 are part of the freq. counter.
I think You can ask here
edaboard.com
At least on digital part (freq. counter and PLL).
pabllosee 1 year ago
@pabllosee Thanks for the tip, awesome :)
simonthewizard 1 year ago