[ARC5] Visual alignment connections

[J. Forster]

By 'diode load at 2nd detrectot' you mean the point where the top of the
volume control is often connected?

If that is the case, you would be seeing the response of the entire IF strip.

To aliogn a receiver, looking only at that point, you need to inject the
swept IF starting at the end furthest from the antenna, and aligh stage by
stage, moving toward the antenna.

If you monitor at the tail end and inject at the antenna end you will get
garbage.

-John

===================


> Well, I am still very confused by what I have read concerning connection
> of a
> Frequency Modulated signal generator to a receiver and viewing the output
> on a 'scope.
>
> According to every single book and article I have read over the past few
> days
> on this subject, they ALL show the "Y" axis of the scope connected
> directly to
> the diode load at the "2nd detector" and a synchronizing signal fed to the
> scope's external "X" input or to its external horizontal sweep input.
>
> All of those photos and drawings all show the outline of the IF passband
> appearing exactly as one can see in my Photos 2, 3, and 4.
>
> Yet, every time I try to connect my equipment the way those other books
> and
> articles show, the results are most decidely NOT the "outline of the IF
> passband". Most of the time there is simply nothing recogizable seen.
>
> ALL of those documents by so many different outfits cannot ALL be wrong
> the same way!
>
> The only way I can get what I want is to use (as John Forster
> mentioned....more than once) an RF probe with an LP filter included,
> removal of the 2nd detector tube completely, and connection to the input
> of
> the detector diode at the output of the last IF transformer.
>
> Might anyone have even a clue as to what in the heck is going on here?
>
> I might add that I have connected a standard scope probe to the same point
> I connect my RF probe. What I get on the screen is a vertical
> double-image,
> one up and one down, "filled in" but with the outline identical to what I
> see
> with the probe alone in place.
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
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