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40m,15m,10m and 6m(7/21/28-29 and 50MHz) Four-band Vertical Antenna
CP-725H
Operation Instructions
・ Description
①The CP-725H is a four-band vertical
antenna for HF band.
②Compact, light weighted and very easy
to assemble.
③It is completely self-supported and
does not need any guy wires.
④Trap radials could be concentrated on
one direction instead of spreading
them around the antenna. This is
especially convenient if the antenna is
installed on balconyrailing or window
side of condominiums and urban
apartments.
⑤Since the antenna is direct DC ground
at the feed point, coaxial cable and
transceiver are beingprotected from
the high voltage caused by lighting.
⑥Center frequencies of the antenna are
adjustable in each band simply by change
the length of each radial element.
⑦Top loading structure utilizing capacitive
hat enables the antenna to complete
with full quarter wave length antennas
in its performance.
⑧It is rigid and rugged enough to withstand
the wind pressure over 100MPH.
⑨Mast brackets area adjustable to accept
1 1/5" to 2 1/3" diameter mast.
⑩Feed point section is kept waterproof
by covering it with support pipe.
⑪10m FM band compatible.
・ Parts Description
Parts # Description
M27001 Mast bracket set
M27002 Mast support pipe
M27003 Radial element holder
M27004 Feed point assembly
M27005 Pipe No. 1 φ15
M27006 Double element trap coil
assembly
M27007 Pipe No. 2 30φ
M27008 Capacity hat assembly
M27009 6m(50MHz) radial element
trap coil assembly
M27010 10m(28-29MHz) radial
element trap coil assembly
M27011 15m(21MHz) radial element
trap coil assembly
M27012 40m(7MHz) radial element
trap coil assembly
M27013 Radial element
M27014 Radial element fastener ring 4
M27015 Grip nut
M27016 Hex head screw M6 x 8
M27017 Spring washer M6
M27018 Tapping screw M4 x 8
M27019 Internal tooth lock washer M4
M27020 Capacity hat fastener ring
M27021 V-bolt with nut
・ Parts Description
Radial element fastener ring
M27014
Qty
2
1
1
1
1
1
1
4
1
1
1
1
4
4
3
3
4
4
1
2
Capacity hat assembly
M27008
8cm
Capacity hat
fastener ring
M27020
Screw with radial
element fastener ring
Nut with radial
element fastener ring
Radial element
M27013
Feed point
assembly
10m(28-29MHz) radial
M27004
element trap coil assembly
M27010
Radial element holder
M27003
6m(50MHz) radial element
trap coil assembly
M27009
Mast support pipe
M27002
Mast bracket set
M27001
Pipe No. 1 φ15
M27005
Internal tooth lock washer M4
M27019
Tapping screw M4 x 8
M27018
Double element
trap coil assembly
M27006
※ Radiator has a water drain hole.
Leave it opened.
Internal tooth lock washer M4
M27019
Tapping screw M4 x 8
M27018
Pipe No. 2 30φ
M27007
Spring washer M6
M27017
Hex head screw
M6 x 8
M27016
15m(21MHz) radial element
trap coil assembly
M27011
Screw with radial
element holder
Grip nut
Radial nut
40m(7MHz) radial element
trap coil assembly
M27012
Hex head screw
M6 x 8
M27016
Spring washer M6
M27017
V-bolt with nut
M27021
（Fig 1）
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Related Manuals for Diamond Antenna CP-725H
Summary of Contents for Diamond Antenna CP-725H
- Page 1 40m,15m,10m and 6m(7/21/28-29 and 50MHz) Four-band Vertical Antenna CP-725H Operation Instructions ・ Description ・ Parts Description ①The CP-725H is a four-band vertical antenna for HF band. ②Compact, light weighted and very easy to assemble. ③It is completely self-supported and does not need any guy wires. Pipe No. 1 φ15 ④Trap radials could be concentrated on M27005 one direction instead of spreading them around the antenna. This is Capacity hat assembly especially convenient if the antenna is M27008 installed on balconyrailing or window side of condominiums and urban Internal tooth lock washer M4 apartments. Capacity hat M27019 fastener ring ⑤Since the antenna is direct DC ground M27020 Tapping screw M4 x 8 at the feed point, coaxial cable and M27018 transceiver are beingprotected from Double element the high voltage caused by lighting. trap coil assembly ⑥Center frequencies of the antenna are M27006 Screw with radial ...
- Page 2 ①Keeping transmitting with high VSWR mast bracket set and attach the ③Donʼt drop the antenna, tools and may cause the radio to be damaged. insulators at within 1m from the attachment when installing the antenna Stop transmitting immediately and mast bracket set in order to in the height. Install the antenna before check the following matters. If it insulate. assembling it on the ground. doesnʼt solve the problem, please ・ It is possible to remove the ask the dealer or Diamond Antenna radials you donʼt use the band 《Antenna location》 Corporation. for. ①If the CP-725H is located on the [Condition: If the antenna doesnʼt seem roof of a house or top of a building, to receive well or propagate well] One direction style radial elements look around the roof to see if there Check 1: Is the antenna too close to are any obstacles such as an electronic the building wall? If the obstacles are wire or TV antenna. The CP-725H too close to antenna, VSWR is higher has to be located as far away as and the radiation pattern is disturbed. possible from those things to obtain Please install the antenna from the its maximum performance. Installing building as far away as possible. (Fig-3) the antenna too close to the building wall may cause bad effect for electrical ...
- Page 3 Frequency range 40, 15, 10, 6m (7, 21, 28-29, 50MHz) ①Prepare suitable VSWR meter for Support Feed point Impedance 50Ω Mast pipe operating frequencies and output VSWR Less than 1.5 RF power. Then connect it as shown Maximum power rating in below. 200W SSB (7MHz) V-bolt CP-725H (Fig-6) 400W SSB (21MHz) 500WSSB(28/29/50MHz) ⑥Place the radial element holder from Maximum RF power rating of upper end of the support pipe and VSWR continuous wave (FM/CW) is about Tranceiver fasten temporary with screwdriver. meter 1/3 of it in SSB mode. Do not fasten too tightly at this stage, Maximum wind resistance 100MPH (Fig-8) otherwise feedpoint assemblies might ...