Radiator
Feed point assembly
Screw
Grip nut
Radial element
Hex head screw
Radial element holder
Mast support pipe
Align water drain hole
downward when attach
Frequency
3.500-
3.62MHz
3.68-
3.72MHz
3.745-
3.805MHz
Radial Standard Length
Approx. 550mm
(3.55MHz)
Approx. 300mm
(3.68MHz)
Approx. 250mm
(3.745MHz)
Variation
30mm/10KHz
40mm/5KHz
25mm/10KHz
Combinations
Hatx2, HatSx2
HatSx4
HatSSx4
Frequency
7MHz
Radial Standard Length
Approx. 570mm
(7.05MHz)
Variation
10mm/10KHz
CP8040
Tranceiver
VSWR
meter
(Fig-8
）
Hex head screw
(Table A)
(Table B)
Coaxial cable
↑
Applox. 12cm(4.7")
↓
Mast
Trapping hole
this side
Support pipe
Mast brackets
Spring washer
Nut
V-bolt
Mast
Support
pipe
（
Fig-6
）
(Fig-7
）
1.5
1.4
1.3
1.2
1.1
3.5
7
MHz
-10
-15
KHz
+10
+15
KHz
f
0
f
0
⑤
Attach mast support pipe to mast
with mast brackets. Mast support
pipe’s tapping hole has to be
placed above the brackets and it
has to be pointed outside against
the mast. Upper end of mast
support pipe has to be placed
more than 12cm(4.7’) above the
top end of the mast.
⑥
Place two radial element holders
from upper end of the support pipe
and
fasten
temporary
with
screwdriver. Do not fasten too
tightly at this stage, otherwise
feedpoint assemblies might not be
put into the support mast later.
⑦
Connect a coaxial cable to
feedpoint assemble through the
support pipe. Then align the hole
in the lower part of feedpoint
assembly with the hole in the
support pipe and secure them with
hex head screw and spring
washer.
(Note) Please do the waterproof
processing to the connector
section.
⑧
Place
vertical
element
on
feedpoint assembly and fix with
two hex head screws and spring
washers.
⑨
Turn each radial element into
radial element holders. Then align
water drain hole in each radial
element trap coil assembly
downward by turning backward
and fasten each element with grip
nut.
<<Note>>
To avoid breaking each radial
element trap coil assembly, turn it
into a holder lightly till it stops and
turn backward to align water drain
hole downward and secure with a
screw.
・
Adjustment
<<Note for frequency adjustment>>
Practice the following adjustment
procedure at the place where
theantenna is actually installed.Test
transmission for the adjustment has
to be performed for as short time as
possible and with as low RF power
as possible. Maximum RF power
rating of continuous wave (CW) is
about 1/3 of it in SSB mode.If the
antenna is installed on a long
balcony railing, the railing itself may
work as a radial element and VSWR
of the antenna may not be changed
with the adjustment of attached
radial element length. If resonant
frequency of the antenna is within a
desired range, the antenna can be
used normally in this case. If
resonant frequency is out of desired
frequency range and adjustment is
required, the antenna has to be
isolated from the railing, moved to a
different place or installed on a mast,
which is at least 1m to 2m (3.3’ to
6.6’) long.
①
Prepare suitable VSWR meter for
operating frequencies and output
RF power. Then connect it as
shown in below.
②
Adjustment procedure can be
started from any frequency you
like. Transmit at desired frequency
and trim adjustment length of radial
element to have lower VSWR at
the frequency.
・
Adjustment length of radial element
Adjustment length of each radial
element is shown in the following
table. If you do not have a VSWR
meter, adjust it to a typical
adjustment length.
(3.55MHz/7.05MHz)
※
7.0-7.2MHz can be adjustable.
※
3.500-3.805MHz can be adjustable.
※
If the radial element of a band is
made longer, resonant frequency
of the band is made lower propor-
tionally.
※
Though typical adjustment length
of each radial element is set at
center frequency of each band, it
varies more or less depending on
the place the antenna is installed.
Adjustment example:
If center frequency of 40m band is
set at 7.050MHz and real center
frequency when the antenna is
installed is at 7.010MHz, then
frequency difference between is
7.050MHz (desired center frequency) -
7.010MHz (real center frequency) =
40KHz.
From Table A, adjustment length at
40m band is about 10mm per
10KHz,therefore:
10mm x 40KHz / 10KHz = 40mm
Since real center frequency is lower
than desired center frequency, radial
element has to be made 40mm
shorter to have 7.050MHz center
frequency.
・
VSWR
・
Specifications
Frequency range
3.500-3.805MHz
7.00-7.20MHz
Feed point Impedance 50Ω
VSWR
Less than 1.5
Maximum power rating 200W(SSB),
70W(FW/CW)
Maximum wind resistance 35m/sec
Vertical element length 6.53m
Radial element length
1.8m
Weight
4.1kg
Connector
M-J
Mast diameter accepted 1 1/5” - 2 1/3”
(30-62
φ
)
Design
2 band trap vertical
antenna with trap radials
Though these products purchased
are manufactured under strict quality
control, if damage is caused by
transporting, ask your dealer
promptly.
Design and specifications
of these products will be
changed
for
future
improvement
without
advance notice.
DIAMOND ANTENNA CORPORATION
Miyata Building, No.15-1,1-chome Sugamo,Toshimaku Tokyo,Japan 170-0002 TEL.03-3947-1411 FAX.03-3944-2981
Home Page http://www.diamond-ant.co.jp
E-mail [email protected]
