President DwightD

For discussions on CB Radio Alignment and Tuning
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fatdude1
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President DwightD

Post by fatdude1 »

trying to fix this for an old timer

anyone have the alignment procedure for this radio

the board is PC-198AA with the D858 chip

all help is much appreciated
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Min
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Post by Min »

Here is a link to something I just found for ya, Not sure what kind of alignment you are wanting to do.

http://www.radiomods.co.nz/unidenpresidentvrlist.html
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Min
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Post by Min »

Dwight D

AMC-VR6
RF POWER- L13
MOD Meter- VR5
RF Meter- VR4
AM S-Meter- VR2
AM Squelch- VR3
TX Freq- L21

I hope thats what you where after. Let us know.
fatdude1
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Post by fatdude1 »

oh im sorry need the full alignment procedure receice is low on this one
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Rick
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Re: President Dwight D (uPD858) RX alignment procedure.

Post by Rick »

Radio setup:
Channel 19 (27.185 MHz).
RF gain set to max.
N.B switched off.
Set Signal generator to 27.185 MHz with a signal of 1uv.

RX alignment procedure tune L1, L2, L3, L4, L5, L6, L7 and L8 for max signal on scope at the junction C29 and C30 this is TP8 not show no diagram.

Run through the alignment for a second but with Signal generator set to 0.5uv, when you completed the alignment adjust L1 clockwise 1/4 to 1/2 turn, this stops front end flood on strong signals.
S meter is VR1.
Rick.
fatdude1
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Post by fatdude1 »

Thanks very much rick

my scope took a crap so all i can do is use the meter of the radio for now


Merry Christmas & Happy New Year to ya & everyone else
fatdude1
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Post by fatdude1 »

Rick

this radio does not have the L2 can you listed is there another board out there for this

i believe this a president honest abe on bigger box
Last edited by fatdude1 on Tuesday 18th Dec 2007, 9:01, edited 1 time in total.
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Rick
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Post by Rick »

The alignment procedure I gave you is for PC-198. You quote below
trying to fix this for an old timer

anyone have the alignment procedure for this radio

the board is PC-198AA with the D858 chip

all help is much appreciated
Rick.
fatdude1
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Post by fatdude1 »

ok dude

the board does say PC-198AA

cant find L2 anywhere on the board

thanks for the fast reply
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Post by fatdude1 »

will the s/n number help
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Rick
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Re: President Dwight D (uPD858) RX alignment procedure.

Post by Rick »

Do you have the sch diagram for the radio?
What is the ref and ic number of the AF amps you should find two AF amps.
Rick.
fatdude1
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Post by fatdude1 »

no but im look to see if they are marked
fatdude1
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Post by fatdude1 »

cant read them bro sorry
fatdude1
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Post by fatdude1 »

thanks for all the help rick

after really looking at this radio its a wash because it was stored in a damp place for some time there are lots of the components are corroded.
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