[Hammarlund] Sweep-alignment.

[Kenneth G. Gordon]

On 27 Jul 2014 at 21:38, Bob Camp wrote:

> By far the most impressive job I´ve ever seen (in 50 years doing this) was on
> the production line at Motorola. They had a setup for doing 455 KC IF´s with a
> sweeper. The gal could do an entire IF from off the chart to dead nuts in spec
> in under 20 seconds. That´s crazy good for a > 16 can IF (including the 
> filter).  It was an amazing feat that I´ve never seen equaled. 

Man! Would I ever have loved to see that, and to learn how it was done!
 
> Anything I´ve ever tried to do, you need to slow things down so much that the
> sweep is a bit of a pain to use. It works much better on wide band stuff than
> narrow.

Yes. Too fast of a sweep can make the tuned circuit ring which causes the 
display to be difficult to analyze.

Lately, I have been using a cheap B&K Sweep Function Generator to both 
FM the signal generator (HP-8640B) and to simultaneously sync the scope.

Works well for normal vintage receiver's 455 Khz IFs, but I have not yet tried 
this method with "tighter" IF stages nor crystal filters.

Ken W7EKB