[Premium-Rx] Fwd: WJ8888 LO problem finally sorted

[Peter Rovardi]

Sent from my iPhone

Begin forwarded message:

> From: Peter Rovardi <peter.rovardi at btinternet.com>
> Date: 6 March 2014 10:05:44 GMT
> To: "premium-rx at mailman.qth" <premium-rx at mailman.qth>
> Subject: WJ8888 LO problem finally sorted
> 
> Hello group,
> 
> Service note for any WJ8888 with the following symptom:-
> 
> Front panel controls all appear to function correctly ie audio present, filter selection, even tuning the full range 0.5 to 30.5Mhz as indicated on the display,  However the radio does NOT tune but is fixed on one frequency.
> The problem was traced to board A18 
> ( 1st / 3rd LO / Time base) chip "U3" which is a 74S00. Use only this chip as other equivalent types are not fast enough, and create strange frequency offsets on the display.
> 
> For any questions relating to this problem mail me direct.
> 
> 73,s.  Peter G4HSB.
> 
> 
> Sent from my iPhone