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President DwightD

Posted: Sunday 16th Dec 2007, 18:54
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

Posted: Sunday 16th Dec 2007, 19:04
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

Posted: Sunday 16th Dec 2007, 19:12
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.

Posted: Monday 17th Dec 2007, 3:00
by fatdude1
oh im sorry need the full alignment procedure receice is low on this one

Re: President Dwight D (uPD858) RX alignment procedure.

Posted: Monday 17th Dec 2007, 4:44
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.

Posted: Monday 17th Dec 2007, 4:57
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

Posted: Tuesday 18th Dec 2007, 8:37
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

Posted: Tuesday 18th Dec 2007, 8:56
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

Posted: Tuesday 18th Dec 2007, 9:03
by fatdude1
ok dude

the board does say PC-198AA

cant find L2 anywhere on the board

thanks for the fast reply

Posted: Tuesday 18th Dec 2007, 9:10
by fatdude1
will the s/n number help

Re: President Dwight D (uPD858) RX alignment procedure.

Posted: Tuesday 18th Dec 2007, 9:16
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.

Posted: Tuesday 18th Dec 2007, 9:18
by fatdude1
no but im look to see if they are marked

Posted: Tuesday 18th Dec 2007, 9:23
by fatdude1
cant read them bro sorry

Posted: Friday 28th Dec 2007, 4:22
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.