Topband: Tunable filter for MFJ-259B - more info appreaciated

[Jerry T Dowell]

That would be the MFJ-731 Analyzer filter. It is basically a series-tuned
circuit shunting the "Antenna" port of the analyzer and tuned to the
frequency of the interfering BC station. The frequency range switch adds a
fixed parallel LC across the line also. Several adjustments must be made in
order to do a given measurement with the antenna analyzer. You can download
the manual without schematic from the website Bill posted.

73, Jerry  AI6L