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

DIRTY HARRY

Hi :D ,does anybody know the procedure for converting one of these from a 40 channel midband set to make it also have the UK 27/81 band aswell? i know if i do a direct swap with the tc9106 for a tc9119 it will give me the UK 27/81 as the pinouts on both pll's are the same,but the pcb in the Uniden ...

DIRTY HARRY

Hi guys

,just done the regular mod on my Grant with the PC-999 board for 3Khz of slide as stated in the info of this mod on the net,does anybody know if or how to increase the amount of slide,Cheers,Shaun

DIRTY HARRY

Hi mate,cheers for that

,i noticed one or two of the numbers in the picture you added numbers to are in different places compared to the last revision of the diagram you made,especially number 6

Cheers again,Shaun

DIRTY HARRY

Hi Warhorse & thanks for your input mate :D much appreciated :wink: I took a picture of the channel selector pcb,anychance you could copy the pic & put numbers besides the solder points using microsoft paint to show me the exact pins then repost it? as this is priceless info for everybody as its not ...

DIRTY HARRY

Hi Warhorse

Thankyou for being so helpfull.Thing is the diagram you showed me for the pin out does not look like what i have here,i will post a picture of the channel selector pcb when i find my camera.As for the LED display its definetly a positive one.Cheers again ,Shaun

DIRTY HARRY

Hi people :D ,does anybody have the correct procedure for midbanding one of these? I know they have the Cybernet 134AOX pcb board which is shared by many other u.k rigs such as the harrier cbx,rotel 240 etc,etc.But there are one or 2 differences as there are one or two extra componants etc on the ...

DIRTY HARRY

Maybe if you could be ar*ed to explain in detail what the voltages should be etc & not be so condescending, then maybe i could fix the problem myself, thanx for your feeble input, i will ask elsewhere,goodbye.

DIRTY HARRY

I do not know how to test them as there is no mention of voltages in the service manual i have for this rig.However i replaced tr13 with a replacement,still no difference.

DIRTY HARRY

Hi Rick,yes you are right there are 2x vr's on the pc-547 board 1 is for the channel 9 squelch gate & the other is the main squelch.So which componant would you suspect to be the problem on the main pcb for the open/closing slowness on the main squelch?

DIRTY HARRY

Hi Rick, but the stalker 20 has a seperate squelch pcb its pc-547.

DIRTY HARRY

Hi Rick, the stalker XX (20) uses the pcb-411 board & is the exact same pcb as the president madison with the MB8719 Pll chip uses.

DIRTY HARRY

DIRTY HARRY

Hi Dave, it does not buzz if i use an external psu unless i put the mike near the PSU , any idea's to sort it? Also the warble is sorted, had too much v.d.c going to the clarifier.

DIRTY HARRY

Hi guys :D ,i noticed when i key up on fm there is a slight buzz in the audio & it picks it up even worse if i put the mike close to the inbuilt transformer inside the rig.Also if i go on usb the audio warbles ever so slightly on the edge of my audio using the standard mike & increase's cosiderably ...

DIRTY HARRY

Nobody have the answer to this problem??

DIRTY HARRY

Hi Guys , i own a Stalker XX & the squelch seems to have a delay as it seems to be considerably slower at opening & closing compared to the 9fdx i used to own, any idea's??

Cheers

DIRTY HARRY

Hi warhorse

yep i did the mod & it had the reverse effect as you suggested it might,coz when i swapped the transistor rx sensitivity went down so i have replaced the 2sc1730, was worth a try,cheers for your input on this,Shaun

DIRTY HARRY

Can anybody pleae tell me which is the IF amp transistor in the President Adams? as i have a bagfull of new 2sc2999's,would like to swap the original & see if there is a dramatic improvement, as this mod worked superbly in my old Lincoln

,cheers.

DIRTY HARRY

think i will get back to you on this when i have a more accurate frequency counter in my possesion,also i would have to measure the amount of drift over a period of time,as it just does not occur all the time,cheers anyway.

DIRTY HARRY

Cheers for that warhorse, but i already have access to all the info etc,thing is i would'nt know where to start as its all above my head,thats why im here for idea's as to what the problem could be,cheers again,Shaun

DIRTY HARRY

Hi, yep its drifting about 1khz on both, (when it does)

DIRTY HARRY

both drift,but this is an irregular thing,sometimes its stable for hours.

DIRTY HARRY

Hi Rick

, yes i have already put the clarifier back to being a stock one, the drift is there still on ssb,i have exchanged the ssb crystals out of my realistic trc-449 as they are the same but the problem still persists, any idea where else i could try,cheers mate,Shaun

DIRTY HARRY

Hi Zodiac or who ever is reading this, thought i would start a new thread for the Adams mod talk etc since we were talking about it in the wrong area before, right Zodiac i tried your slide mod & yes it went about 3khz either side of the 12 o'clock position, any idea's on how i could increase the ...

DIRTY HARRY

Rick wrote:
I think you should start a new thread in CB Radio Modifications.
As this is a mod and not alignment question.

Yeah your most right to say that, just got carried away while we were on the subject of the Adams

DIRTY HARRY

This pin 7 is normally tied high.
The easy way to do this is to cut the track to pin 7 and solder a 4K7 resistor across the track you have cut, now solder a wire to the pin side of the resistor and solder a second wire to ground then solders the ends of the wires to a switch.
When the switch is ...

DIRTY HARRY

Rick wrote:How about switching Pin 7.

How would i do that to get it to work Rick? i aint seen that mod on the web.

DIRTY HARRY

But how do you get on the 5's, you'll only have the zero's.
You'd need to be able to switch from one to the other not just replace it. Good point zodiac, so if i just exchanged the 10.240mhz crystal with a 5.120mhz one would it definetly just transmit on the zero's only? as im not well up on how ...

DIRTY HARRY

Hi zodiac & cheers for getting back to me,o.k if thats only how far it slides then its not worth doing for me, was hoping it would slide 5kc either side, i was doing a google search & came by this...

Cool radio hack #2: A President Adams CB radio, 40 channel, 858 SSB chassis. The 858 PLL is capable ...

DIRTY HARRY

NightRanger,
It may be a bit late but D32 in the MK2 Adams PC 346 is part of clarifier being unlocked and that may be reason your having trouble getting on frequency.
The full unlock.
Desolder one end of R117, D30 and lift them out of the holes or remove them both.
Remove the wire from next to ...

DIRTY HARRY

Cheers for Explaining Rick, i will have a look at it & let you know the outcome,regards,Shaun

DIRTY HARRY

Hi Scott

,, i do have a thurlby thandar lab counter with a probe leads, i know its not 100 % accurate but works , So i could test the i,f & loop frequencys if you could please tell me the test points & procedure to carry this out,thanks beforehand,Shaun

DIRTY HARRY

I have just replaced balanced modulator AN612 & still no success, Dam! wish i could get this old bird to work on USB

as its in exceptionally good physical condition

DIRTY HARRY

Hi Brian

, yep im also getting confused, especially with those voltage readings off the pins, i just tested C125 & C126 & they are alright to, im thinking of letting a decent tech to look at it as its doin my head in mate

Shaun.

DIRTY HARRY

Gooday Brian

,below are the measurements i am gettin on my multimeter
with the switch in the corresponding mode while testing on each tag.

Blue wire/L24/LSB/ 8.10 Vdc

Green wire/L25/AM/ 0.01 Vdc

Yellow wire/L26/USB/ 0.01 Vdc

DIRTY HARRY

Check L28 and D38 too.

If you have a continuity tester, put both probes accross the diode, then swap them round, it should conduct one way but not the other way.

Brian. Right Brian, i have tested D33,D37,D38 & D39 All only conduct one-way like you said at 0.6 volts or just above, so thats one we ...

DIRTY HARRY

They are probably just standard silicon diodes, in which case a 1n4148 will be fine as a replacement. Definitely worth cheching that L25 isn't open circuit as well.

Brian. Hi again Brian :D mmm i see maplin actually do stock something that i may need for once, as they actually stock 1n4148's.
Is ...

DIRTY HARRY

Brian Morris wrote:Did you test the diodes when you removed them, or replace them with new diodes?

Brian.

nope not yet Brian, i hav'nt looked at their values yet on the schematic & i have only just started looking at this rig ,so i have no replacements just yet.

DIRTY HARRY

Hi guys, i have just desoldered & resoldered..

Loop Oscillator:
L22,L23, CT1 and D33 (USB)

I.F. Oscillator:
L30, L31, CT2 and D39 (USB)

& D37, Yet still no joy!

DIRTY HARRY

Hi Scott

would the Balanced modulator be IC3 which is a AN612 ?

DIRTY HARRY

Cheers Brian, any help is very much appreciated

DIRTY HARRY

Hi Brian :) , i already tried the mode switch & that seems fine as i swapped the lsb & usb wires around & it still did'nt work on usb.I already have the circuit diagram & block diagram, but i am not that well electonically minded in knowing how to read or understand the different componants/stages ...

DIRTY HARRY

Radio Make.Uniden
Radio Model.Grant
PCB number.PC-409AC
PLL number. MB8719

Hi :D I have just acquired a Uniden Grant (basically a president Grant) Like brand new, with pc board number PC-409AC, But it has a problem i do not have any audio rx or tx on usb, yet am & lsb work 100% perfect.I can hear a ...

DIRTY HARRY

Hi Rick, i did'nt realise that schematic was yours,well done,best & the easiest schematics to read :D Had a look inside her & R168 has already been removed along with d33.So that says to me somebody has done half of a job trying to get swing on this 9fdx before, think i can manage to do what you ...

DIRTY HARRY

Rick wrote: Remove R168.

do i replace this with a jumper or just leave the 2 holes vacant??

DIRTY HARRY

LOL! Cool

I am going to buy/scrounge all the bits i need tonight, so after completion it should slide 5-6khz either side of the 12 'o clock position so then i can get onto the zero's ,yes??

DIRTY HARRY

Rick wrote: Change R231 from 6K8 to 3K3.

Hi Rick

do you mean change R231 to a 3.3 k ohms?

DIRTY HARRY

just been talking on another forum about this mod & a guy said this super diode would increase the slide

http://www.firecommunications.com/trdbase/mv1404.pdf

but they are not cheap..

http://cgi.ebay.co.uk/DIODE-MV1404 ...

DIRTY HARRY

Shaun,
Your right D31 is the varactor diode. You could also try a ITT410 out of an old Cybernet multimode radio but 10KCs of total slide, i don't think so. :cry: cheers zodiac, just looked inside her, & d33 has been removed & d31 is present,think its still the original varicap diode,think i shall ...

DIRTY HARRY

Change the Varicap diode d32 to some think like BB809 and unhook one end of d33.

James. Hi James, have you carried out this modification yourself to a 9fdx? & did it work o.k & how much swing did you get out of the clarifier?? also i was looking at the schematic here

http://www.cbtricks.com ...

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

Search found 54 matches

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Re: Stalker 9FDX Making the Clarifier in to a slider.