President DwightD
President DwightD
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
anyone have the alignment procedure for this radio
the board is PC-198AA with the D858 chip
all help is much appreciated
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
http://www.radiomods.co.nz/unidenpresidentvrlist.html
Re: President Dwight D (uPD858) RX alignment procedure.
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.
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.
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
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.
Re: President Dwight D (uPD858) RX alignment procedure.
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.
What is the ref and ic number of the AF amps you should find two AF amps.
Rick.