Mk1 Jackson Board.

[14CS06]

No its not the guy i got the s9 from...lol he has all his stuff listed on gumtree now just do a search for it...anyway i just took bottom case of and number on board is PB-042AD. Any ideas how old this might be ? Also it it black front and made in Philapines.

Hello

PB-042AD 1991



@+
Claude

[listner132]

Yes thats the one..thanks guys for all the help...and for the person that asked it has a 6 pin mic socket on it.

[ch25]

As in all Jackson radios AGC need to be fixed.
Great radio BTW. One of the best IMO.
Chris

[cb4ever104]

Yeah . I think I must have been sleeping when I first posted on this thread . Just had a look . The Uniden factory in the Philippines opened in 1988 . So , lots of 148 GTLs and 2000 GTLs being pumped out at that time I imagine So 25XX = 1992 , and 025XX = 2002 (I think )

[Mudslinger]

Forget what people say about the silver, Taiwan built Jacko's, I reckon the Black 5 band Philippines ones are the best.

The black finish is much more durable than the silver, which looks awful once worn or scratched.

[ch25]

Remove brown wire coming from power socket area to mic PCB.
You will avoid a lot of problems in the future.

[Mudslinger]

Remove brown wire coming from power socket area to mic PCB.
You will avoid a lot of problems in the future.

What if you run a powered mic, like a Liberty etc?

To be honest you may be better off changing the socket to 4 pin, it will be loads easier if you have other Uniden radios in the shack, especially if you use a single mic/desk mic with them.

[slamjam]

Forget what people say about the silver, Taiwan built Jacko's, I reckon the Black 5 band Philippines ones are the best.

The black finish is much more durable than the silver, which looks awful once worn or scratched.

I prefer the silver ones for looks - never noticed any difference performance wise between the black and silver.

[ch25]

Remove brown wire coming from power socket area to mic PCB.
You will avoid a lot of problems in the future.

What if you run a powered mic, like a Liberty etc?

To be honest you may be better off changing the socket to 4 pin, it will be loads easier if you have other Uniden radios in the shack, especially if you use a single mic/desk mic with them.

Use 8V from internal regulator.
On brown wire you have direct connection to power supply, imagine what can 20A(or whatever amperage of PC is) when you make mistake when wiring microphone.
I had plenty of those on my workbench to repair.

[cb4ever104]

I prefer the silver ones for looks

So do I , but they're getting on in age now . And it's difficult to find one in good condition . I have a boxed black 5 band as well . AGC mod done on it . There's not many radios that beat it for performance and reliability .

Sammy

[Mudslinger]

I reckon the PC-999 Grant works better. Better than the PB-010 as well.

Shame they are harder to expand and the dual clarifier models don't have much shift.

[listner132]

I am enjoying this thread i started loads of help from good guys in the know. Thats a couple of people mension the AGC mod ? please can someon shed some light on this for me ?

[Mudslinger]

AGC mod dramatically reduces the amount of distortion that strong SSB signals cause.

On an unmodded radio the RF can be backed off to remove the distortion, but after the AGC mod there is no real need.

It is easy to do if you can read resistor values and you can solder/de-solder PCB's.

[listner132]

this is fantastic help.

thanks very much again.

[ballo]

I don't have my file here that I use , but I think it's 2002 . I don't think they were producing Jackson in the Philippines in 92 . Didn't they start about 94/95 ? Anyway . Look at the date code on the PLL/Binary adders to make sure .

Production of the president Jackson MK1 (Silver) was in the mid 80's with the PB042 board (MRF477) , i had one of the very first and the price was 749 dutch guilders . I have still somewhere the serialnumber tag because i had to mlunt the potmeter for adjustable power.