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Foryoursafety:
Instruction Manual
Read this manual carefully for proper handling and operation before using.
Keep this manual in a safe place for future reference.
you might be killed or injured if you
don’t follow the below instructions.
Warning
Warning : you might be killed or injured if
you don’t follow the below instructions.
① Select a safe place, according to the related laws
and regulation in your country.
② Choose a calm day to erect the antenna to avoid
accidents.
③ Do not try to erect the antenna while lightning.
④ Do not touch the antenna while transmitting,
otherwise you might get burned.
⑤ Do not erect this antenna near any overhead
wires or illuminating lamps. It would cause a serious
You could be injured, or property
damage could be caused if you
Caution
don’t follow the below instructions.
Caution
① Check SWR before using. COMET Antenna Tuner
CAT‐300 is highly recommended for tuning. (In case
you use the tuner, make sure to check its max power.)
② Operation at this antenna in a residential area is
likely to cause interference. You’ll be required to take
whatever measures to correct the interference.
③ This antenna is outdoor large equipment, so you’ll
be careful when you erect this antenna in order not to
bother your neighbors.
accident if the antenna falls.
⑥ Select a stable site. Erecting the antenna in a
precarious place might cause serious accident.
⑦ Be careful not to fall any tools or screws from
the high place while erecting the antenna.
Make sure to fix the coax cable securely. Otherwise
stiff wind could fan the cable, and cause the serious
damage.
● Specifications
Frequency Range : 2‐30MHz
Input Impedance : 50Ω
Max. Input Power : 150W (PEP)
VSWR : 2.0 or less (2‐18MHz), 3.0 or less (18‐30MHz)
Connector : Balun SO‐239 (M‐J type)
Antenna length : Approx. 25m (82ft)
● Appearance
● Parts List
1. CWD‐230 Antenna … 1 set
(w / Balun)
● Installation instructions & image
1. Confirm if it complies with the safety standardorrelatedlawsinyourcountry.
2. Keep the antenna as parallel as you can. Turn the Terminal‐R up and the balun down. Use the
nonmetallic rope to fix the both ends of antenna to the pole.
3. After inserting the connector, Stretch the self‐fusing tape two times longer and wrap it around
the connector. Wrap the vinyl tape on the self‐fusing tape to keep weather resistance in case you
use it for a long time.
● Installation Image
● How to check VSWR
1. VSWR could be changed due to the environmental influence.
Check before using if VSWR is in the normal range(around 2.0 or less).
2. Measure VSWR in the shortest possible time, at the lowest power. Strong radio signals could
be blanketing.
3. As necessary, follow the below diagram.
Surrounding buildings, trees or low ground height could be the cause of high VSWR. 10m or more
above the ground is highly recommended.
Connection Diagram
(Example of reference)
COMET CO.,LTD.
336‐0026 Japan
4‐18‐2,Tsuji,Minami‐ku,SaitamaCity,Saitama‐Pref
TEL: +81‐48‐839‐3131 , FAX: +81‐48‐839‐3136
URL http : //www.comet‐ant.co.jp
Appearance and specifications are subject to change without notice.
2nd edition. May 2018
Copyright (C) 2018 COMET CO.,LTD. All Rights Reserved.
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