[ARC5] Visual alignment of BC-454

[WA5CAB at cs.com]

Ken,

Some better 'scopes have buffered sweep output on the front panel.  One 
benefit of using it is that the CRT is blanked during retrace.

In a message dated 5/23/2013 2:51:40 PM Central Daylight Time, 
kgordon2006 at frontier.com writes: 
> >Ken,
> >
> >To be more clear:  The asymmetry to which I was referring was the the
> >freqeuency hump in the passband, not the asymmetry of the retrace.
> 
> Yes. I figured that out, thanks.
> 
> >Ian is right in stating that the retrace should look like a mirror
> >image of the forward trace.  Something is going non-linear during the
> >retrace.  I think that is a separate issue from the passband hump.
> 
> Well, IMHO, IFF the sweep is REALLY a ramp or true sawtooth, rather than 
> a triangle, the retrace should show essentially a very weak straight line.
> 
> A triangle wave or a sine wave would show two traces, one the mirror-image 
> 
> of the other.
> 
> My sweep output is almost a ramp. The return-to-zero end is NOT a vertical 
> 
> line. It a quite finite, and then some, return to zero. 
> 
> And the ramp itself is not straight either. In fact, the slower the 
> sweeps, the 
> more curved the ramp actually is. 
> 
> As I said, in order to get what is really there, I need a much better 
> ramp-generator...one with almost instant return-to-zero, and with a truly 
> linear ramp.
> 
> I am investigating various circuit diagrams.
> 
> Ken W7EKB
> 

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