--- In [email protected], Mathew Quaife <[EMAIL PROTECTED]>
wrote:
"... will just have to do it with the SA and see what happens there."
______________________________________________________________________
If your spectrum analyzer has a tracking generator - just sweep align
the filters and forget the procedure in the book.
You would start by setting the analyzer center frequency to the
frequency the station used to be on. Set your sweep width [span or
dispersion on some instruments] to 40 or 50 MHz. Then normalize the
instrument to remove the test cable insertion loss. When you connect
the filter, observe the flat passband and skirt characteristics and
measure the filter's insertion loss. When you move it down in
frequency, you want the picture on the screen and the insertion loss
to be the same.
If your spectrum analyzer does not have a tracking generator you can
connect it to the Motorola probe and use it as a frequency selective
voltmeter. Once you get close to the correct adjustment, some
analyzers will let you change the vertical display to 1 or 2 dB per
division or even to linear which will help you fine tune it.
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