[Hallicrafters] SX-28 Questions

[Joe Connor]

Thanks to the group, individually and collectively, my SX-28 is really starting to shape up. I've replaced all the paper caps (including the notorious 11 in the RF deck) as well as out-of-spec resistors. Sensitivity is now excellent (at least below 12 mHz). 

I have two more questions.

1. The ANL transformer (T-5) has an open primary. Until I can get that apart, is it likely to affect performance?

2. The IF alignment puzzles me.

     a. the first step is to adjust T1, T3 and only one screw on T2. I understand that. 

     b. The next step is to turn on the BFO and adjust to Crystal Broad. It says to adjust the top screw on T2 while varying the signal generator frequency until I get two maximums and a dip between them. It's described as a swishing note, as opposed to a sharp crystal note. This is the part I don't understand. Am I using a modulated signal through my generator? Can someone explain this step to me? I assume it's designed to adjust the IFs to the crystal frequency. 

    As always, thanks.

                                                Joe Connor