[Hallicrafters] SX-28 Questions

[rbethman]

Joe,

The "swishing note" is just like setting calibration against a carrier.  
Ignore modulation.  Remember "zero beat" of days gone by.  When you are 
within a "few" cycles of zero, the S-meter will SLOWLY swing back and 
forth, AND you hear a "swishing" sound in the audio. 

The purpose of THIS step is to align to the BFO center frequency.

Are faint memories coming back? <BG>

Bob - N0DGN

Joe Connor wrote:
> 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
>
>
>       
>
> ______________________________________________________________
>
>   

-- 
Bob - NØDGN