Diamond Antenna W-735 Technical manual

HF Multi-band Wir Dipol (Trap Dipol ) Ant nnas
Diamond W-S ri s
W-8010 - 80m/40m/20m/15m/10m. Fiv Band Trap Dipol Ant nna
W-735 - 80m/40m. Dual-Band Trap Dipol Ant nna
Op ration Instructions
Parts List
Each model con ains he following par s. Please confirm all par s are accoun ed for before assembly.
W-8010 W-735
BU-50 BALUN with two screws, nuts, and washers 1 1
80m Trap 2 2
40m Trap 2 -
20m Trap 2 -
Wire Element A 3.75m (12.3ft) 2 -
Wire Element B 4.2m (13.8ft) 2 -
Wire Element C 2.8m (9.2ft) 2 -
Wire Element D 2.8m (9.2ft) 2 -
Wire Element E 1.4m (4.6ft) 2 -
Wire Element F 10.95m (35.9ft) - 2
Wire Element G 2.9m (9.5ft) - 2
Wire Element H 3.75m (12.3ft) - -
Wire Element I 3.4m (11.2ft) - -
Adjustment Element 0.4m (1.3ft) 6 2
Insulator 4 2
Nylon Rope 10m (32.8ft) 2 1
Self-melting plastic sealing tape 0.3m (1.0ft) 1 1
Binding wire 0.6m (2.0ft) 2 1
D scription
(1) The W-Series an ennas are very easy o assemble. Wi h 10 guage s randed plas ic coa ed wire wi h low s re ch ra io for elemen s.
(2) Adjus men elemen s are provided o adjus each band wi hou affec ing he res of he bands.
(3) A comple ely molded wideband balun enables perfec wea her proof performance.
Ass mbl d ant nnas
Insulator
Wire
Element C
Wire
Element B 40m Trap Wire element A Balun
Nylon rope
80m adjustment
element
80m Trap Wire element D
15m adjustment
element
20m Trap
10m adjustment element
Wire
Element E
20m adjustment
element
Insulator
eerWirWi t Ae elemenir
W
or
t C
40m T
elemen
Elemen
or
t
ope
ap
t
nsula
I 20m adjustmen
Wi
r
0m T
elemen
t
80m adjustmen
ylon r
t BElemenElemen
t
nsula
I
ap
t A
un
t D
ap
t
t
t E
elemen
t20m adjustmen
Elemen
er t elemen
10m adjustmen
ap
r
r
20m T
20m T
telemen
t
15m adjustmen
e elemenirW
e elemenir
W
r40m T
Nylon rope Wire element G Wire element F Balun
Insulator
80m adjusment
element 80m trap 40m adjustment element
t G
or
tap
80m tr
elemen
80m adjusmen
tnsulaI
e elemenirW
ope
ylon r
N
Balun
telemen
t40m adjustmen
t Fe elemenirW
W-8010
W-735
Fig.1
Fig. 2
1

Asse bly
The antennas are assembled as shown per figures.
1. Turn wire element approximately 20cm (7.9”) through balun and
bind two parts by binding wire as shown per Fig.1. In case of the W-
8010, two wire elements for one side are bound together.
Note: Cut binding wire for approximate y 10cm (3.9”) each to bind.
2. To install a trap, turn a wire element approximately 15-16cm (5.9”-
6.3”) and then hook the element to wire holder section of the trap and
turn crimped terminal side of the element four times around the other
side of the element. Put crimped terminal through wire holder and fix
with nut and spring washer. (each adjustment element is to be set at
balun side of each trap.)
3. To install a insulator, put a element approximately 55cm (21.7")
through the insulator and tie the element once as shown per
Fig.3. Then bind the element with binding wire as shown per Fig.3.
Note : Since each wire e ement is being affixed with its own cord.
assemb e the antenna by referring to each assemb ed an-
tenna figure.
Note : Set adjustment e ement downward to avoid effecting reso-
nant frequency of the main e ement. And at insu ator sec-
tion at both ends. rest of 55cm (21.7') turned back be-
comes an adjustment e ement.
Note : Tie an insu ator and ny on rope firm y as shown per Fig 4.
4. Finally, connect 50Q coaxial cable to the balun.To make con
nector Section waterproof, wrap around self-melting adhesive
plastic tape supplied by stretching it about two times. Then wrap
around conventional plastic tape to ensure it.(Fig 5)
Installation
There are various ways of installing the antenna depending on
the place where it is installed. In any case, take the following
points into account.
1. Since maximum voltage occurs at both ends of the antenna in
transmission, touching these points may lead to electric shock.
And it is recommended to locate both ends of the antenna al
least 1 to 2m (3.3'to 6.6') away from a building wall to avoid
spark noise which may cause TVl.
2. If the antenna is installed the way it is shown in Fig.B or D. to
avoid having direct load from coaxial cable, turn a coaxial cable
around the balun once and fix with a plastic tape. Set coaxial
cable away from the element to avoid causing bad VSWR or
unstable VSWR.
3. If the antenna is installed between two trees, to avoid breaking
the element by strong wind, it is recommended to pul elastic ma-
terial such as rubber band or coil spring at the both ends of the
element.
4. Since antenna adjustment has to be practiced at the place where
the antenna is being operated, it is useful to make the antenna
up and down easily. It is also useful get rid of earth effect if the
antenna is installed as a horizontaldipole antenna, for the height
of the antenna is related with propagation impedance of the an-
tenna.
20cm(7.9”)
7cm(2.8”)
20cm(7.9”)
7cm(2.8 )
15-16cm
(5.9”-6.3”)
Spring washer
Adjustment element
Trap
Wire holder
(5.9”-6.3”)
asher
t
ing
t elemen
djustmen
A
ing w
Spr
Spr
15-16cm
eholder
p
ir
W
a
Tr
55cm(21.7”)
5cm(2.0”)
Binding wire
Adjustment element
55cm(21.7”)
5cm(2.0”)
e
tt elemendjustmenA
Binding wir
Fig. 1
Fig. 2
Fig. 3
Fig.4
Fig.5
2

Adjust ent
1. Prepare a VSWR power meter for applicable frequencies and RF
power, and set the meter as shown in the following figure. Practice
test transmission for the adjustment as short time and least RF
power as possible. (Maximum power rating in canstant wave (CW)
mode is approximately 1/3 of one in SSB mode.)
er
er met w
VSWR po
eiv
ansc
r
T
er
enn
t
n
A
Start adjustment from the highest operating frequency downward
by cutting adjustment element, both sides in same length, to de-
sired resonant frequency, least VSWR return at the frequency.
Since cutting the element in excess may skip desired frequency
and result in losing resonant frequency, cut the element little by lit-
tle.
* If VSWR cannot be better
If VSWR can not be lowered even though resonant frequency came
to be desired frequency by cutting the element, it is most likely that
the antenna is being effected by earth or near by nuildings. Then it
is advised to change antenna height or antenna location. Bending
the element downward from the balun can also change VSWR.
Adjust ent ele ent cutting chart
*Cutting adjustment element will raise resonant frequency.
t elemen
djustmen
A t elemen
*The following chart shows resonant frequency change per 1cm
element cut
Frequency W-8010 W-735
80m(3.5MHz) 4 HZ 4 Hz
40m(7MHz) 7 Hz 7 Hz
20m(14MHz) 45 Hz -
15m(MHz) 40 Hz -
10m(28MHz) 70 Hz -
*Above values may change depending on surrounding environment
h
t
t suppor
o poin
w
T
Tw
> 120°
(
ed
tervnI
Fig. A
Fig. B
Fig. C
Fig. D
Fig. E
3

Calculating exa ple of ele ent 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)
42 Hz (frequency difference)
Since frequency change per 1cm at the 40m band is 7 Hz from
the chart.
42( Hz) ÷ 7( Hz/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 ele ents 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.
t15m band elemen
elf-madeS
VSWR charts
o
z
t
ot
ot
ot
ot
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
ot
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 1.2 W PEP 1.2 W 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 • [phone]
www.dia ondantenna.net