[R-390] aligning an R-391 IF deck

[Paul H. Anderson]

Howdy,

I'm still aligning my 391.  I left my URM-25D on for 3 days, and it is
stable enough to get the job done (I'll leave it on until I'm done).

The coil in Z501 still doesn't peak - in fact, doesn't affect the vtvm at
all.

I went further in alignment, and found one dead 2nd oscillator band - will
check crystals.  This problem I can see how to work and will track it
down.

However, when I went to align the RF slugs, and the first set (3-4MC, I
think) didn't affect vtvm output at all!  I'll double check again tonight,
but am interested in course of action to take when tuning coils or slugs
don't change the diode load level.


On Mon, 29 Apr 2002, Roy Morgan wrote:

> At 10:24 PM 4/28/02 -0400, Paul H. Anderson wrote:
> >I notice that with my URM-25D, the output frequency drifts fast enough
> >that it is fairly difficult to find peak frequencies -
>
>
> There is something very wrong with your URM-25.
>
> Push and pull on the frequency set knob.. if the frequency changes much,
> the shaft end play mechanism is loose.  Gotta fix that.

It is loose - it seems to be stable if I'm not pushing or pulling hard on
the knob, however.  I have a decent frequency counter to verify this.

> Other wise something else is out of whack.

The URM-25 appears to need recapping and re-alignment.  I'll try and make
do with it for now, however, as I've got too many other broken things to
fix first.  I've got Dallas Langsford's (sp) notes, and should be ok with
those.

Paul