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Selecting the Frequency
The rods can be adjusted to nearly any frequency. If the desired
frequency lies outside the listings on
Table 2
, simply follow the
directions below to fine-tune your system.
Lowering the Frequency
To lower the frequency of a Hot Rodz® equipped antenna, do the
following until you achieve the desired results:
1.
Move the rods out from the center to form a larger capacity hat.
2.
Add more stainless steel rods (6 maximum).
3.
Use longer rods.
4.
Add a whip.
5.
Extend an existing whip further in length.
Increasing the Frequency
To raise the frequency of a Hot Rodz® equipped antenna, do the
following until you achieve the desired results:
1.
Move the rods in toward the center to form a smaller capacity
hat.
2.
Add fewer stainless steel rods.
3.
Use shorter rods.
4.
Remove an existing whip.
5.
Retract an existing whip (less length).
Installation example for 40 Meters
Ordinarily mobile operation on 40 Meters requires users to install a 40 Meter coil and 32-inch whip
on a Hustler MO-2 mobile mast, resulting in an antenna about 102 inches high (54 inches for the
MO-2 and 48 inches for the resonator and whip). This combination resonates at about 7.16 MHz.
From the chart you can see that by using DX Engineering Hot Rodz® you can install a Hustler 20
Meter coil (RM-20) and the 24-inch rods (supplied) and the 12-inch whip that resonates even lower
at 7.1 MHz, but is only 78 inches high!
As a result, the base impedance drops to 20 Ω, a decrease of approximately 30 Ω resistance from
your antenna system. This may not present a problem for you. This combination successfully was
used with and automatic tuner in an FT-900 radio and excellent reports were received. The
DXE-
MM-1
Dual Impedance Transformer will make it easier on your rig's tuner and may increase the
frequency range that you can achieve a low SWR.
