[Premium-Rx] Arg! Help with Alignment and test equipment set up

[Paul]

Boy oh boy!

Ya think ya know it all and have good test equipment and then go to use it
and don't get the expected results. I am thinking I may not have a real
problem with the Racal 6790, I think I may have just mucked it up when I
really did have a 15 error last month. 15 came up after a random BITE I did,
and found that the group of coils in A2 were a little off so I did an
alignment on A1 input filter and A2 1st mixer. That fixed the 15 error but
now that I have my 6793 installed, I see there is a definite lack if
sensitivity in the 6790. 

Here is my situation. The test equipment I have to play with is an IFR-1500,
HP 8901B mod analyzer, 8640B generator, 475B scope, Booton RF millivoltmeter
with RF probe, Millivac RF meter with RF probe, lot's of 50ohm cables with
SMA, SMB, N etc connectors. Probably some other stuff too but this is what
is currently setup on the bench. I used the IFR-1500 in Duplex mode, which
has a spectrum analyzer and sweep function in it, to just tune up the input
filter, the round cylinder with 4 or 5 slugs in it. Thanks to Francis et al
who sent me the alignment instructions. Following the instructions, I am
unable to see any change when I spin the L1 slug around at 30MHz. Nada. Zip,
no diff. When I use the Boonton with the probe, measuring the open ended
output of the filter, unterminated, I can see a change but no peak, it just
keeps rising until I run out of slug. I think I am doing this properly?

I would really like to get the front of this receiver back in alignment and
get it back in the rack. This should be a simple procedure but it's tunring
into a multi day project.

I have been working with RF for many years and just can't figure this out. 

Any help, suggestions, a shotgun, would be appreciated.

Kind regards,

Paul
VE7KHz