Topband: MFJ 259B on 160M

[Guy Olinger K2AV]

Another approach to interference off band uses a different analyzer, with a
BC rejection band pass filter in line.

The AIM4170 will allow you to run a "calibration" through the BC filter to a
50 ohm reference and save the scan data as a custom calibration.  Using that
calibration allows it to see "through" the filter, presenting a scan without
filter distortions.

The AIM4170 works with a laptop which does all the number crunching using a
program supplied with the unit, making the combo a "software defined"
process.

The various kinds of units all have their particular useful circumstances.

73, Guy.

On Thu, Sep 24, 2009 at 9:25 PM, Art <k6xt at arrl.net> wrote:

> Par Electronics makes a very good BC filter. Easily meets specs in 50
> ohms according to my swept analyzer.
>
> http://www.parelectronics.com/bcst-hpf.htm
>
> 73 Art
>
> Glen wrote:
> > Hello,
> >
> > Has anyone made an effective AM broadcast filter (HB) for their analyzer?
> >
> > I have to feel that my lack of readings on the unipole may stem from AM
> > interference.
> > I have a station here in town, or close on 1400khz.
> >
> > 73's
> >
> > Glen K4KV
> >
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> >
> >
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