CP6A
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6 Band Trap Vertical 75-6m
Instruction Sheet
The CP6A is a multi-band trap-vertical antenna for HF bands, covering the 75*, 40, 20, 15, 10m & 6m amateur bands.
Made from heavy duty aluminum, the CP6A is easily assembled, yielding excellent performance and reliability from
a compact base station antenna.
Specifications
FREQUENCY: 75* – 40 – 20 – 15 – 10 – 6m
POWER: 200 Watts P.E.P.
IMPEDANCE: 50 Ohms
VSWR: 1.8:1 (Nominal). See table A for tuning.
ELEMENT PHASING: 1/4 Wave trap vertical groundplane.
GROUNDING: Direct Grounding. Antenna element & radials connected to mounting pipe.
MAX WIND RATING: 80 MPH (no ice)
MAX DIA ACCEPTANCE: 1.2 – 2.4 inches
OVERALL LENGTH: 15.10 feet (4.9kg)
WEIGHT: 9.9 lbs. (130 g)
CONNECTOR: SO-239 female UHF
WARRANTY: 90 Days limited waranty against defects in material and workmanship.
Antenna Location & Mounting
The CP6A is a compact vertical antenna using loading-coil radials. The compact size offers many options on mounting
location. When choosing a mounting location, keep the following factors in mind:
(1) Resonant frequency of HF antennas can change based on location. Antenna should be mounted away from trees, buildings and other antennas.
(2) If mounting near house or balcony, best performance will be achieved if mounted at least 15 feet away from structure.
(3) To avoid unsafe conditions, do not install near electrical or power lines.
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacific Street • San Marcos, CA 92069 • (760) 744-0900
www.diamondantenna.net
Antenna Assembly Instructions
(1) Before assembly, verify all parts are included for proper assembly. The following tools will be required for assembly:
tape measure, phillips screwdriver, and two crescent wrenches or metric open-end wrenches.
(2) Radial Assembly. Assemble each radial trap coil (part #: 15210-15215) to a radial element (part #: 15216) using
fastener ring (part #: 15217); see figure A. Adjust for proper radial length. See table A (page 3). Lightly tighten setscrew at
this time, as later adjustment may be required for VSWR tuning.
(3) Assemble mast pipe #1 (part #: 15205); double element trap coil assembly (part #: 15206); single element trap coil
assembly (part #: 15207); and mast pipe #2 (part #: 15208) together with self-tapping screws & washers enclosed (part #:
15211 & 15222). Align holes in each joint section and fasten.
(4) Assemble capacity hat assemblies (part #: 15223) with radials (part #: 15209). Assemble 75m capacity hat (top) with
standard radials (13-3/4”). Assemble 40m capacity hat with 2 standard radials (13-3/4”) and 2 longer radials (20”).
Note: some applications will require adding additional longer radials to tune 40m bands to desired frequency. See #12
below for additional tuning info.
Secure radials with lock nut fasteners. Attach capacity hat assemblies in proper location.
Note: capacity hat holder is located 9.4” (24cm) below the top end of single element trap coil assembly. See figure B.
The lower holder is located 3.1” (8cm) below the top end of double element trap coil assembly. Align capacity hat assemblies
for proper appearance.
(5) Attach support pipe to mast with brackets and U-bolts. Support pipe's bolt hole must be above brackets and pointed
away from mast (see figure C). Support pipe must be 4.7” (12cm) above tip of mast; this provides adequate clearance for
radial assemblies.
(6) Lightly attach element holders on support pipe.
Note: Damage may occur to support pipe if fastened too tight, as matching network will not fit into support pipe.
(7) Insert coax-cable through support pipe and attach to matching network (part #: 15204). Align threaded hole with
matching network and fasten bolt.
(8) Place assembled vertical elements on matching network with fasten bolts.
(9) Attach radials to element holders (see figure D).
Note: Position of radials is not critical, but 80m and 40m radials should be positioned further from surrounding objects
or structures.
If mounting radials in one direction, 80m and 40m must mount on opposite ends from each other. You must lower element
holder 0.8” (2cm). See figure E.
(10) Thread radial until snug and reverse until water drain hole is in downward position (see figure D). Secure radial with
lock nut attached to trap.
(11) After antenna assembly is complete, securely faten all screws and fastener bolts.
(12) Check VSWR (see figure F) with quality meter (Bird, Coaxial Dynamics, Diamond, etc. MFJ Analyzer is not recommended for this antenna) and adjust each radial to desires center frequency. Refer to table A for tuning adjustments.
Note: VSWR tuning may vary based on mounting location and obstructions.
40m tuning can be adjusted by adding additional longer capacity hat radials. The longer radials will have the effect of raising
the center frequency. Once adjustment range is achieved, 40m tuning radial can be adjusted for best VSWR.
(13) After antenna VSWR adjustment, an antenna tuner may be utilized to extend useable bandwidth.
We suggest mounting immediately beneath the antenna a one-turn choke coil of approximately 6-10” diameter. This will act
as an isolation choke, and release strain on connector. The coil diameter is not critical.
Note: Some cables require a larger diameter coil to prevent movement of center conductor. Tape coil to mast (see figure G).
capacity hat
capacity hat
15m radial
15212
10m radial
15211
6m radial
15210
Antenna Description Part Description
Part # Description Quantity
15201 Mounting clamps w/u-bolts 2
15202 Support pipe 1
15203 Radial element holders (CP-6) 2
15204 Matching network 1
15205 Assembly pipe #1 1
15206 Double element trap coil assembly 1
15207 Single element trap coil assembly 1
15208 Assembly pipe #2 1
15209 Capacity hat radials w/lock nuts 8
15209A 40m capacity hat radials (long) 4
15210 6m radial assembly 1
15211 10m radial assembly 1
15212 15m radial assembly 1
15213 20m radial assembly 1
15214 40m radial assembly 1
15215 75m radial assembly 1
15216 Radial elements w/lock nut (CP-6) 6
15217 Radial element fastener rings (CP-6) 6
15218 Radial lock nut (CP-6) 6
15219 Heck head bolts M6X8 5
15220 Lock washers M6 3
15221 Self tapping screws M4X8 6
15222 Internal tooth lock washers 6
15223 Capacity hat radial holders 2
75m
40m
15204
15208
15207
15206
15221
15222
15205
15220
15219
15209
15223
15216
15217
80m radial
15215
15218
15201
40m radial
15214
see Fig. A
15203
15202
20m radial
15213
Table A
Note: VSWR tuning varies based on mounting location. Adjust for minimum VSWR.
Approximate Radial Length Approx. Length/ Approx. Bandwidth
Band for VSWR adjustment Frequency Change 1.8:1 SWR or better
75m/3.9 MHz 17.5 inches 1.4 inches / 10 KHz ± 20 KHz
40m/7 MHz 31 inches 0.4 inches / 10 KHz ± 40 KHz
20m/14 MHz 18 inches 0.6 inches / 20 KHz ± 100 KHz
15m/21 MHz 17 inches 1.25 inches / 50 KHz ± 200 KHz
10m/28-29 MHz 26 inches 1.1 inches / 50 KHz ± 500 KHz
6m/50 MHz 13 inches 2.0 inches / 1 MHz ± 3 MHz
(see Table A)
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page 4
One Direction Mounting
Fig. A Fig. B
Fig. C
Checking VSWR
standard
mounting
Fig. E
Fig. D
Fig. F Fig. G
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