[Hammarlund] HQ-110 alignment - the "visual" alignment method.

[Kenneth G. Gordon]

On 6 Apr 2006 at 23:29, James A. (Andy) Moorer wrote:

> The only thing the fast rate will do is to limit how narrow a
> bandwidth you can reasonably expect to measure.
> 
> At 1ms sweep rate, any bandwidth near or below 1 kHz will be dubious -
> that is, what you see won't necessarily have anything to do with the
> "actual" filter response. A filter with a 1 kHz bandpass takes a
> couple of milliseconds to wake up and hear the electrons rumbling down
> the wire, much less decide what it is going to do with them.

Ah! I had misread his setup. I thought the 1ms sweep rate was the 
horizontal sweep rate of the scope, while he was setting his sweep 
generator to a very slow rate.

You're right, of course, and I was wrong. Ya gotta keep that sweep 
generator moving SLOOOOWLY so the IF stage doesn't ring and give 
you false indications.

> . . . but it is still a really cool setup! I gotta get me one of them
> sweep generators.

I use a cheap B&K sweep generator, and it works like a charm. I have 
seen them for sale on eBay for around $50.00.

Ken W7EKB