Calculating example of element cutting
length.
*Since quantity of the frequency change by cutting adjustment el-
ement may change more or less depending the place where the
antenna is installed, it is recommended to cut the element a bit
shorter for adjustment.
Cf. If desired frequency is 7.052MHz at the 40m band and pres-
ent resonant frequency when the antenna is initially installed is
7.010MHz, VSWR and reflected power is lowest in 7.010MHz:
7.052MHz (desired frequency)
-) 7.010MHz (present frequency)
42KHz (frequency difference)
Since frequency change per 1cm at the 40m band is 7KHz from
the chart.
42(KHz) ÷ 7(KHz/cm) = 6(cm)
Since present frequency is lower than desired frequency, cutting
the element for 6cm will make resonant frequency to desired
7.052MHz.
If antenna has two elements such as W-8010.
1.
The antenna can be operated with unused band element being
removed. In case of the W-8010, however, 80m, 40m, and 15m
share one element. And 20m, and 10m share another element,
therefore, only one of those bands can not be removed.
2.
As shown in the following figure, one element does not have to
be installed for the same direction as another element.
( >30°)
To add new band.
It is possible to add 15m band the the W-735 antenna. As shown
in the following figure, installing self-made 15m element to the
balun will add 15m band to the antenna.
t
15m band elemen
elf-made
S
VSWR charts
o
z
t
o
t
o
t
o
t
o
t
z
-250KH
z
-200KH
z
-50KH
z
-30KH
z
-12KH
z)
10m(28MH
z
15m(21MH
z)
20m(14MH
z)
40m( 7MH
)
80m(3.5MH
1.1
1.2
1.3
1.4
1.5
z
+250KH
z
+200KH
z
+50KH
z
+30KH
z
+12KH
o
z
t
o
t
z
-75KH
z
-15KH
z)
40m( 7MH
)
80m(3.5MH
1.1
1.2
1.3
1.4
1.5
z
+75KH
z
+15KH
W-8010
W-735
Specifications
Model
W-8010
W-735
Frequency
80m/40m/20m/15m/10m
(3.5/7/14/21/28MHz)
80m/40m
(3.5/7MHz)
Impedance
50Ω
50Ω
VSWR
Less than 1:5:1
Less than 1:5:1
Max. power rating
1.2KW PEP
1.2KW PEP
Length
19.2m(60.0’)
26m (85.3’)
Weight
2.5kgs. (5.50lbs)
1.85kgs. (4.07lbs)
Type
5 band dipole
2 band dipole
Connector (BU50 Balun)
UHF female (SO-239)
UHF female (SO-239)
Origin
Made in Japan
Made in Japan
4
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacific Street • San Marcos, CA 92078 • (760) 744-0900
www.diamondantenna.net
