- 3 -
Install the Hustler® 75/80 RM Resonator to the top of the 4-BTV in the threaded rod that is
protruding from the top tube.
When installing stainless steel hardware, it is suggested that
UMI-81343, UMI-81464, DXE-
NSBT8
or
DXE-NMBT8 - Never-Seez®
or
Anti-Seize
be used to prevent thread galling.
Tuning
An antenna analyzer is the best way to adjust the resonant frequency of an antenna. The MFJ-259B
Antenna Analyzer is an ideal piece of equipment for tuning a Hustler® BTV antenna.
Measurements should be made at the antenna using a short (5 or 6 ft) piece of 50 Ω coax between
the antenna and the analyzer. If you are too close to the antenna your presence can affect the tuning,
if you are too far, the coax length may act as a radial and resonate. Taking readings close to the
antenna also eliminates the possibility of a long or marginal feedline influencing the tuning or
causing erratic readings. You should tune the antenna for resonance (X=0) rather than for low SWR,
although they are often close or at the same point. Normally, the SWR goes down somewhat and the
bandwidth increases once the feedline is reconnected and you measure the SWR at the operating
position.
The whip must be trimmed for the frequency desired. The chart below shows good starting points.
Using the MFJ-259B analyzer will aid in getting the desired resonance. Make small adjustments to
the whip length and verify you are going in the proper direction. Use the old adage "Measure twice,
cut once". If you desire to have two frequencies that are far apart (CW -vs- SSB), you may want to
have two whips One whip cut for the lower frequency in the CW area of the band, and another
whip cut for the higher end in the SSB area of the band.
DIMENSIONS INDICATED
ARE APPROXIMATE
FREQUENCY
(KHz)
Exposed Tip Rod
Length
Your Final
Length
4000
18”
3950
19-
5/8”
3900
21”
3850
22-
1/2”
3800
24-
1/8”
3750
25-
5/8”
3725
26-
1/2”
3700
27-
1/4”
3650
29”
3600
30-
5/8”
3550
33”
3500
34-5/8
The above dimensions
are the exposed tip rod
length. See illustration.
Detailed information on tuning and making the Hustler® BTV series vertical antennas top
performing systems can be found on the DX Engineering website (
www.DXEngineering.com
) -
look in the BTV antenna area of the website for the
"
BTV Guide
"
. Additionally there are a number
of add-on kits available to further enhance your Hustler® BTV antenna.
