开云体育

I said that two sentences later:

"At narrow
RBW settings, you have to fine-tune the TG to be exactly
on frequency, that's the screwdriver adjustment on the front
panel. Since you don't know that it's spot-on, start with
a wide RBW then narrow it down."

Said screwdriver adjustment trims the 3MHz LO which mimics the
final I.F. of the 8552. Late versions of the 8443A have a
"Restore Signal" mode which uses the actual IF signal from
the 8552. In that mode, as long as it's within the SA's RBW,
the TG puts out exactly the frequency presented to the SA's RF input.
Note: This doesn't work with early 8552's, they don't bring
their final IF out to the bulkhead. While the mod is conceptually
simple, it's physically difficult due to the location of
the contacts, so I haven't done it to my 8552A.

And another note: When the 8553B is in FULL scan mode, it
puts out its own marker in addition to the one from the
8443A. Fortunately they are recognisably different:
the former is a dip in trace height while the latter
is a change in trace intensity. And a note about that.
How much brighter it gets depends on the Marker Intensity
control, which adjusts the time the scan is paused at
the marker position.

Regards,
Dave Wise