MFJ-1798 Vertical Antenna Instructions
21
FREQUENCY AND SWR ADJUSTMENT
This antenna covers wide frequency ranges on higher bands, and
narrower segments on lower frequency bands. The 40 meter band has
the narrowest range of operation (approximately 40 KHz). The 80
meter band has a bandwidth of approximately 60 KHz and is the
most sensitive to adjustments.
Please read the following hints:
1.) The normal resonant frequency of this antenna is at (or just
below) the bottom of each amateur band.
This allows the user to
"trim" a small amount off the inside end of the capacitance
spokes to raise the resonant frequency. Conversely, adding a
longer capacitance spoke will lower the resonant frequency of a
loading assembly. Spare spokes are included in case you need to
lower the resonant frequency of the antenna.
Figure
10
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