[R-390] First 390A Alignment prep and weak bands

[Tim Shoppa]

> The signal level was fairly consistent across all bands with the
> 2 and 3 mc/s bands being the notable exceptions.

With regards to RF alignment, the bands are:

0.5-1 MC
1-2 MC
2-4 MC
4-8 MC
8-16 MC
16-32 MC

It looks like you need to check out the 2-4 MC RF section.  Not just
alignment but condition of the coils/caps, bandswitches, etc.

Sometimes the variable caps go shorted, other times the inductors
go open-circuit, etc.  The latter especially when somebody pumps a
few hundred watts of RF into the front end!

Sounds like your variable IF sections are OK too.  Not that they can't
be topped off, but look where the problem is first.  Tuning up your
IF's won't make 2 and 3 MC come back.  The right time to do the alignment
is after you've gotten all the bands working - if you have to change out
some parts then you may subtly affect the alignment of other bands.

It's vaguely possible that the crystal oscillator section for 2 and 3
MC's are both out of kilter but it seems unlikely.

And check mechanical cam alignment before suspecting any of the
electronics I mention earlier!  Sometimes it's as simple as the clamp
for the cam in question being loose or the springs not working for that
band.

Tim.