PRESIDENT JACKSON 2!

YouTube · Post by **dxswe** » 10 Oct 2008, 05:08

simonthewizard wrote:
I wonder which pot is for the FM devation
limited by a resistor

What is that resistor placed

Guest · Post by **Guest** » 10 Oct 2008, 06:33

Please take a look at the circuit diagram, it is all there. The resistor makes it limited audio, and with a different one makes the audio longer and stronger.

Sorry, really this is a circuit diagram needed and then you can make it as you want. I not have the diagram, sorry

YouTube · Post by **dxswe** » 10 Oct 2008, 06:59

What do think about R586 it's a 2,7K resistor.I find circruit diagram at the http://www.cbtricks.com/radios/presiden ... sc_sch.pdf

Best regards Jan

Post by **Josh_Rogan** » 10 Oct 2008, 21:16

dxswe wrote:What do think about R586 it's a 2,7K resistor.I find circruit diagram at the http://www.cbtricks.com/radios/presiden ... sc_sch.pdf

Best regards Jan

I think you're barking up the wrong tree with R586. I am not an expert on the Jackson 2, and have never looked inside one, but looking at the diagram that you have linked I can see that there is a deviation pot marked RT451 with a value of 4.7k; if this preset is not present on production radios or turning it to maximum still doesn't give you enough FM deviation then I would suggest trying reducing the value of R429 (15k).

If you wanted to try and increase the TX audio on all modes (pre limiting) then I would try increasing the value of R460 (220k).

***DISCLAIMER*** This is all untested and theoretical, so please don't blame me if you break your radio!

Regards,

Josh.

YouTube · Post by **dxswe** » 13 Oct 2008, 08:17

Josh_Rogan wrote:
dxswe wrote:What do think about R586 it's a 2,7K resistor.I find circruit diagram at the http://www.cbtricks.com/radios/presiden ... sc_sch.pdf

Best regards Jan

I think you're barking up the wrong tree with R586. I am not an expert on the Jackson 2, and have never looked inside one, but looking at the diagram that you have linked I can see that there is a deviation pot marked RT451 with a value of 4.7k; if this preset is not present on production radios or turning it to maximum still doesn't give you enough FM deviation then I would suggest trying reducing the value of R429 (15k).

If you wanted to try and increase the TX audio on all modes (pre limiting) then I would try increasing the value of R460 (220k).

***DISCLAIMER*** This is all untested and theoretical, so please don't blame me if you break your radio!

Regards,

Josh.

Thank for your help.I have adjust RT451 and modulation is much better now.

/Jan/

Guest · Post by **Guest** » 13 Oct 2008, 08:33

I have adjust RT451 and modulation is much better now

Thats some good news

Post by **Josh_Rogan** » 13 Oct 2008, 20:31

Thank for your help.I have adjust RT451 and modulation is much better now.

Glad it worked for you.

Regards,

Josh.

jazzsinger · Post by **jazzsinger** » 13 Oct 2008, 22:50

nice tip josh

Post by **MARKASTERIX** » 16 Oct 2008, 22:42

R429 does limit the audio on FM this is a small 0805 or smaller 15k resistor just below the RT451 deviation preset, i replaced mine with a 4k7 and magic nice audio. photo shows position.[img]

Post by **straycat** » 06 Feb 2014, 02:33

I have just bought a Jacko 2 and now that the radio has been on the market for a few years now what are your opinions? The Mrs bought mine as a late Christmas prezzie!

Post by **cb4ever104** » 06 Feb 2014, 07:54

A 5 1/2 year resurrected thread . A new record ?

Post by **CaptainKirk** » 06 Feb 2014, 22:39

Using a used jacko 2 in the car at the moment pleased with it dont know if its had the FM modulation done on it but I noticed on another rig that there is a ping at the beginning when the mic is keyed it only does it on UK40 setting ive known some Midland48+ to do this maybe something to do with getting the rig onto the UK40 I dont know does anybody else have a pinging jacko 2 it doesnt do it in export mode with the shift turned around.

Post by **mof000** » 07 Feb 2014, 08:02

cb4ever104 wrote:A 5 1/2 year resurrected thread . A new record ?

... and jazzsinger is no longer banned!!!

Post by **Mudslinger** » 07 Feb 2014, 10:55

mof000 wrote:
cb4ever104 wrote:A 5 1/2 year resurrected thread . A new record ?
... and jazzsinger is no longer banned!!!

I quite like reading Georges posts.

Straight to the point and without being wrapped in bovine excrement.

Post by **straycat** » 06 Mar 2014, 06:02

CaptainKirk wrote:Using a used jacko 2 in the car at the moment pleased with it dont know if its had the FM modulation done on it but I noticed on another rig that there is a ping at the beginning when the mic is keyed it only does it on UK40 setting ive known some Midland48+ to do this maybe something to do with getting the rig onto the UK40 I dont know does anybody else have a pinging jacko 2 it doesnt do it in export mode with the shift turned around.

Nope mine doesn't "Ping"!

PRESIDENT JACKSON 2!

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