4-BTV, 5-BTV, 6-BTV Multiband HF - K6RF Home of the Porta Base ...

esistance and X=0 or ± j0 reactance are not realistic. The frequency where the lowest SWR occurs
will likely result in analyzer readings that are not perfect.]
If you only have an SWR or power meter use it at the antenna. Use your transceiver or analyzer
and plot a chart of SWR measurements at several frequencies across the range below and above
your target frequency, repeating after every antenna adjustment. Starting at a low frequency,
record SWR measurements at regular increments higher in frequency to determine where the
lowest SWR occurs.
When making antenna adjustments, DO NOT watch a certain frequency hoping for a minimum
SWR to appear. Over-adjustment could cause you to miss the “dip” as it passes your target
frequency. It is better practice to take enough readings in order to follow the minimum SWR point
as you make adjustments so you can achieve low SWR at your target frequency. Make sure you
adjust the antenna traps to
frequencies that are going to
be used, not simply in the
middle of the band.
Hustler Traps
The manufacturer sets the
traps to specific dimensions.
Since you are optimizing the
antenna system using a good
radial system, adjustments
will have to be made. For
reference, the photo below
shows the traps as they come
from the manufacturer. You
should mark spot where the
trap lower tube meets the trap
sleeve with a felt tip marker.
This will help in case you
have to go back to the initial
manufacturer's settings.
[Note: The dimensions shown may vary due to manufacturing assembly tolerances.]
In this tuning procedure we'll be talking about loosening the trap cover,
loosening the band clamp and adjusting the trap sleeve. The picture to the
left shows these parts.
The manufacturer puts a silicone sealant inside the black plastic trap
covers. Loosen the band clamp and twist the trap sleeve while holding the
black trap cover will loosen it. The silicone that was put in there can be
removed so the black trap cover and trap sleeve can be repositioned.
Resealing the trap cover may not be necessary, as it grips the trap top tube
tightly and the trap sleeve has slits at the bottom for moisture to escape. If
you choose to use silicone sealer, be certain it is non-acetic (without a
vinegar smell) and it does not contain metal (DXE-RTV598335).
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