Comet CHF-10 User manual

MODEL CHF-10
Thank you for purchasing our products.
For your safety :
Read this manual carefully for proper handling and operation before using.
Keep this manual in a safe place for future reference.
【Features】
● 1/4λ Base loading type, multi-band HF Antenna.
● Designed to be widely adjustable, simple and compact.
【Specification】
【Appearance】
HF~50MHz 10 Band Mobile Antenna
● TX Frequency : 3.5/3.8/7/10/14/18/21/24/28/50MHz
● Max. Power : 200W J3E/SSB
● Impedance : 50Ω
● VSWR : 1.5 or less
● Connector : PL-259 (M-P)
● Max. Length : 1.88m
● Weight : 830g
Antenna
Base
Element
fixation
screw
Top
Element
Tuning
Bracket
Knurling Vis
Hex Wrench
Knurling Vis
(Long)
Knurling Vis
(Short)
PRECAUTIONS for mounting
!
●Check if the connecting cable fits into the antenna connector. If they don’t
match, it could cause damages or disconnection.
●While driving, the antenna could fall down and SWR could be higher due to
the lack of ground contact area.
●Placing any other antennas or electrical conductors nearby this product
could make SWR higher or fluctuateresonance frequency.
For : 3.5/3.8/7/10/14/18/21/24/28/50MHz
Instruction Manual
Connector
3.5MHz : Aprrox. 5 KHz/cm
3.8MHz : Aprrox. 6 KHz/cm
7.0MHz : Aprrox. 10 KHz/cm
10MHz : Aprrox. 12 KHz/cm
14MHz : Aprrox. 30 KHz/cm
18MHz : Aprrox. 50 KHz/cm
21MHz : Aprrox. 80 KHz/cm
24MHz : Aprrox. 100 KHz/cm
28MHz : Aprrox. 110 KHz/cm
50MHz : Aprrox. 120 KHz/cm
【VSWR Data】

COMET CO.,LTD.
4-18-2, Tsuji, Minami-ku, Saitama-shi, Saitama-Pref, 336-0026, JAPAN
TEL : [phone] / FAX : [phone]
URL : http://www.comet-ant.co.jp/english
【Maintenance】
Check SWR before using to confirm if the antenna works normally.
Check if screws, bolts and nuts are tightened securely, and if not, retighten them.
Be sure to change the parts, deformed by long-term use or low in intensity.
!
Knurling Vis
for temporary use
【How to Adjust】
1. Make sure to choose the right terminal, according to
the right fig.
2. Slide the Tuning Bracket to the designated terminal.
3. Adjust the length of the element to the designated
length, shown in the right fig.
4. Measure SWR at operational freq. Cut the element in
case tuning freq is lower.
5. Extend the element in case tuning freq is higher.
*Freq band could be narrower depending on the
distance with a human body.
**Tuning Bracket should be fixed at Terminal 0 when
used at 3.5/3.8MHz.
Term. 8
Use with 14MHz
for 50MHz
Standard Length L
3.8 MHz :
7 MHz:
10 MHz:
21 MHz:
24 MHz:
28.5 MHz:
51 MHz:
1365 mm905 mm
900 mm945 mm
1020 mm950 mm
1128 mm1050 mm
14MHz:
Term. 7
Term. 6
Term. 5
Term. 3
for 28MHz
for 24MHz
for 21MHz
for 14MHz
It the position
changes to the
top and bottom.
Standard Length L
3.5 MHz : 18 MHz: 1030 mm1185 mm
Term. 4 for 18MHz
Term. 2 for 10MHz
Term. 1
for 7MHz
Precautions for using
This antenna is only for ham radio. Do not use this for other purposes.
Operation outside the specification might damage the antenna.
Adjust the antenna correctly. Elevated SWR could damage the antenna.
Never attempt to modify or fix the antenna by yourself.
Do not touch the antenna while transmitting.
【How to use】
1. Make sure all the screws are securely tightened.
2. Mount the antenna to the base etc.
3. Keep the antenna as vertically as you can for better
transmitting.
4. Measure SWR before using.
Copyright (C) 2010 COMET CO.,LTD. All Rights Reserved.
Specifications or appearance is subject to change without notice.
*Each freq band shall be clearly marked on the element.