[Hammarlund] IF bandwidths?

[Eugene Hertz]

Hello all,

I am undertaking a project (probably foolishly) to adapt a 21.4mhz panadapter for use with various hammarlunds, specifically sp600, hq140x, hq129x.  The idea is to use a balanced modulator, and no, I havent figured it all out yet (and it may not even be possible).

In trying to figure it all out, I was wondering if anyone has ever made any IF bandwidth measurements of these receivers at their widest points in the circuits, before filters.  

Thanks
Eugene