CUSHCRAFT MA6B Manual de usuario

Cushcraft MA6B Six-Band MiniBeam

Parts Inventory: As you unpack, identify and check off each item against the Master

Parts List on the next page. This important step will familiarize you with the various parts

and confirm that you have everything needed to complete construction. If any element

tubes appear to be missing, check inside other larger tubes. Marking each tube as you

inventory—it will speed assembly later, as will sorting the hardware. Save the weight

label attached to the carton. If you claim a missing part, the label has information you'll

need to provide!

Planning: Plan assembly carefully – the work area must be large enough to handle the

10-foot boom and elements up to 18-feet long. Also, the antenna will need to be

supported off the ground when installing the capacitive-hat rods (sawhorses work well).

Trap vents will be exposed the weather during assembly, so cover them if it rains.

Finally, proceed methodically, allow plenty of time, and always have one or more helpers

available to assist with the final installation!

Important Warning: Never attempt to install the MA6B by yourself!

Antenna Location: To realize the best on-air performance, mount the MA6B as high

and in the clear as safety permits -- and remove all vegetation and tree branches from

the area. If you guy the support mast near the antenna, be sure to use Phillystran cord

or an equivalent non-conductor to prevent detuning. Finally, never install where the

antenna could fall and hit power lines, where people or animals could accidentally come

into physical contact with the elements, or where humans could be exposed to high-

intensity RF-fields. See the ARRL Handbook or FCC website for detailed RF exposure

information and guidelines.

Important Safety Warnings: Never assemble or install this antenna where it could

contact power lines or residential entrance cables -- you could be killed! Also,

when the MA6B is energized with RF, touching the elements could cause painful

injury from RF burns – even at low power levels. Finally, never install where

humans could become chronically exposed to high-intensity RF fields.

Mast: The MA6B mounting bracket accepts masts up to 2 inches in diameter. For safety

reasons, the minimum diameter should be at least 1-1/2 inches with 1/8-inch wall

thickness. If thick-wall tubing is unavailable, use two 1/16-inch-wall tubes telescoped

together. Note that the structure supporting your mast must be able to support the 33-

pound antenna plus the added weight of your mast and rotor.

Safely Ground: All towers and masts require a safety ground to help protect against

lightning strikes and static build up. Where possible, drive one or more ground rods

directly underneath the antenna and use solid 10-gauge wire secured with non-corrosive

hardware for all connections. Note that the MA6B driven elements are balanced and

have no direct dc path to ground, so installing a coaxial lightning arrestor is also a good

idea. Of course, the best protection of all is to disconnect all feedlines outside of the

building any time the station is not in use or at the first sign of threatening weather!

MA6B Parts List:

[X] Quan Part # Description .

[ ] 2 MT1 21/28 MHz driven element trap assembly

[ ] 4 MT2 24.9 MHz trap assembly

[ ] 2 MT3 21/28 MHz reflector element trap assembly

[ ] 1 80-MN6B-MB Feed network with coax cables

[ ] 2 MA5BEF Element Tube, 1-1/8" OD x 84", slotted both ends

[ ] 2 MA5BEE Element Tube, 7/8" OD x 12", slotted one end

[ ] 2 MA5BED Element Tube, 1-1/8" OD x 46", slotted one end, drilled other end

[ ] 4 MA5BEC Element Tube, 7/8" OD x 7" slotted one end, drilled other end

[ ] 2 MA5BEJ Element Tube, 7/8” OD x 13-1/2 slotted one end, drilled other end

[ ] 6 MA5BEB Element Tube, 1" OD > 7/8" OD (swaged) x 36", slotted one end

[ ] 2 MA5BEA Element Tube, 1-1/8" OD x 34", slotted one end, drilled other end

[ ] 2 MA5BEG Element Tube, 1" OD > 7/8" OD, (swaged) x 41-1/2", slotted one end

[ ] 2 20-MA6B-DD Element Tube, 7/16" OD x 48", drilled one end, slotted other end

[ ] 2 20-MA6B-DE Element Tube, 3/8" OD x 9"

[ ] 1 20-MA6B-EG Element Tube, 7/16” OD x 72", slotted both ends, drilled at center

[ ] 2 20-MA6B-EH Element Tube, 3/8" OD x 28"

[ ] 2 20-MA6B-BC Boom Tube, 1-1/2" OD x 48", slotted one end

[ ] 1 20-MA6B-BD Boom Tube, 1-1/2" OD x 21", slotted both ends

[ ] 1 20-MA6B-BE Boom Tube Insert, 1-3/8" OD x 48"

[ ] 2 735-1106 Element Mounting Bracket, 6M driven element

[ ] 2 205560-1 Insulating plate, 6M driven element

[ ] 2 193-853 90-degree mounting bracket for insulating plate

[ ] 1 738-1213 Reflector insulating plate, ¼” x 2-1/2” x 3-1/2”

[ ] 1 735-1109 “L”-mounting bracket for reflector insulating plate

[ ] 16 HXR41 41" X-hat rod

[ ] 8 HXR26 26" X-hat rod

[ ] 2 HXR24 24" X-hat rod

[ ] 1 240116 Silicone grease packet

[ ] 1 050115 UHF connector boot, black

[ ] 28 190028 X-hat Half-washer

[ ] 26 190026 X-hat Element bracket

[ ] 4 190033 U-Bolt Backing plate for elements

[ ] 4 190143 Element-to-Boom clamp

[ ] 4 190033 U-bolt backing plate

[ ] 1 758-9200 1/4”-20 x 2-3/4” U-bolt assembly

[ ] 4 010402 1/4"-20 x 1-1/2" ID x 3-3/4" U-bolt

[ ] 10 010085 1/4-20 Hex nut

[ ] 10 010084 1/4" Split lock washer

[ ] 1 190070 Boom-to-Mast clamping plate

[ ] 2 010403 5/16-18 x 1-5/8" x 3" U-bolt

[ ] 2 010404 5/16-18 x 2-1/8" x 3-1/4" U-bolt

[ ] 8 010119 5/16 split lock washer

[ ] 8 010118 5/16-18 Hex nut

[ ] 2 122096 Fiberglass driven-element insulator, 1" OD x 10"

[ ] 1 030413 Worm clamp, 1-1/2 to 1-3/4"

[ ] 4 030412 Worm clamp, 1-1/4" to 1-1/2"

[ ] 8 030411 Worm clamp, 1" to 1-1/4"

[ ] 16 030410 Worm clamp, 7/8" to 1"

[ ] 4 030407 Worm clamp, 3/8 to 1/2”

[ ] 2 050046 1-1/2" Plastic end cap, for boom

[ ] 8 050061 7/8" Plastic end cap for HF elements

[ ] 4 050251 3/8" Plastic end cap for 6M elements

[ ] 46 010941 #8 Lock washer

[ ] 46 010011 8-32 Nut

[ ] 6 010079 1/2" x 8-32 Screw

[ ] 4 010072 3/4” x 8-32 Screw

[ ] 2 010229 1" x 8-32 Screw

[ ] 2 010040 1-1/8” x 8-32 Screw

[ ] 16 010120 8-32 x 2" Screw

[ ] 14 010231 8-32 x 1-3/4" Screw

Step-1. Assemble the boom using the parts listed below:

[ ] 2 Boom Tube, 1-1/2" OD x 48", slotted one end (20-MA6B-BC)

[ ] 1 Boom Tube, 1-1/2" OD x 21", slotted both ends (20-MA6B-BD)

[ ] 1 Boom Tube Insert, 1-3/8" OD x 48" (20-MA6B-BE)

[ ] 4 Worm clamp, 1-1/4" to 1-1/2"

[ ] 1 Boom-to-Mast clamping plate

[ ] 2 5/16-18 x 1-5/8" x 3" U-bolt

[ ] 4 5/16" split lock washer

[ ] 4 5/16-18 Hex nut

[ ] 2 1-1/2" Plastic end cap, for boom

Boom Assembly Stages

Boom Assembly

Boom-to-Mast Clamp Assembly

57"

Reflector End Driven Element End

60"

1-1/2" Worm Clamp (4)

1-1/2"OD x 48" 1-1/2"OD x 48"1-1/2" x 21"

1-3/8" x 48"

13-1/2" 13-1/2"

1-3/8" x 48"

1-1/2" x 21"

End cap End cap

Step-1

Step-2

Step-3

Installation Notes: Assemble boom tubes as shown above. Install end caps and secure

all worm clamps tightly to prevent the boom sections from rotating out of alignment when

elements are attached. Before installing the mast-to-boom clamp, measure off and mark

the boom at 57" (see below):

Top View, Mast-to-Boom Plate Installation

Boom

3" U-Bolt (2)

Boom-to-Mast Plate (1)

5/16" Lockwasher (4)

5/16" x 18 Nut (4)

57" mark

Step-2. Assemble the 20/15/10-Meter Driven Element using parts listed below:

[ ] 2 Element Tube, 1-1/8" OD x 34", slot one end, drilled other end (MA5BEA)

[ ] 2 Element Tube, 1" swaged to 7/8" x 36", slotted one end (MA5BEB)

[ ] 2 Element Tube, 7/8" OD x 7" slotted one end, drilled other end (MA5BEC)

[ ] 2 Trap, 21/28 MHz driven element, MT1

[ ] 1 Driven-element insulator, fiberglass, 1" OD x 10"

[ ] 4 Worm clamp, 7/8" to 1"

[ ] 2 Worm clamp, 1" to 1-1/4"

[ ] 2 8-32 x 1-3/4" Screw

[ ] 2 #8 Lock washer

[ ] 2 8-32 Nut

[ ] 2 7/8" Plastic end cap

20/15/10 Driven Element Assembly

EB EB

EC EC

MT1 MT1

7/8"-1" worm clamp (2)

End Cap

7/8"-1" worm clamp

End Cap Insulator

8-32 x 1-3/4" screw (2)

(Insert 4") (Insert 4")

1" to 1-1/4"

Worm Clamp 1" to 1-1/4"

Worm Clamp

1-3/4" 8-32 Screw

8-32 Hex Nut

#8 Lockwasher

Insulator

Installation Notes: Insert the insulator attachment screws in same direction and tighten

securely (these screws will become the connection points for the feedline). Insert EB

tubes 4 inches into EA tubes. Install all traps with the arrow pointing away from the

boom. Install end caps on EC tubes.

Step-3. Assemble the 17/12-Meter Driven Element using parts listed below:

[ ] 2 Element Tube, 1-1/8" OD x 46", slot one end, drilled other end (MA5BED)

[ ] 2 Element Tube, 1" swaged to 7/8" x 36", slotted one end (MA5BEB)

[ ] 2 Element Tube, 7/8" OD x 12" slotted one end (MA5BEE)

[ ] 2 Trap, 24.9 MHz driven element, MT2

[ ] 1 Driven-element insulator, fiberglass, 1" OD x 10"

[ ] 4 Worm clamp, 7/8" to 1"

[ ] 2 Worm clamp, 1" to 1-1/4"

[ ] 2 8-32 x 1-3/4" Screw

[ ] 2 #8 Lock washer

[ ] 2 8-32 Nut

[ ] 2 7/8" Plastic end cap

17/12-Meter Driven Element Assembly

EE EE

EBEB ED ED

MT2 MT2

1" to 1-1/4"

7/8" to 1"

End Cap

Worm Clamp

Worm Clamp End Cap

1" to 1-1/4"

Worm Clamp

7/8" to 1"

Worm Clamp Insulator

8-32 x 1-1/2"

Screw

Insert 5" Insert 5"

Installation Notes: Follow the same procedure as Step-4, but insert EB tubes 5inches

into ED tubes for this element.

Step-4. Assemble the 20/15/10-Meter Reflector using parts listed below:

[ ] 1 Element Tube, 1-1/8" OD x 84", slotted both ends (MA5BEF)

[ ] 2 Element Tube, 1" swaged to 7/8" x 36", slotted one end (MA5BEB)

[ ] 2 Element Tube, 7/8" OD x 7" slotted one end, drilled other end (MA5BEC)

[ ] 2 Trap, 21/28 MHz reflector element, MT3

[ ] 4 Worm clamp, 7/8" to 1"

[ ] 2 Worm clamp, 1" to 1-1/4"

[ ] 2 7/8" Plastic end cap

20/15/10-Meter Reflector Assembly

EB EB

EC MT3 EC

MT3

1" to 1-1/4"

Worm Clamp

1" to 1-1/4"

Worm Clamp

(4" insert) (4" insert)

7/8" to 1"

Worm Clamp 7/8" to 1"

Worm Clamp

End Cap

Installation Notes: Insert EB tubes 4inches into EF for this element.

Step-5. Assemble the 17/12-Meter Reflector using the parts listed below:

[ ] 1 Element Tube, 1-1/8" OD x 84", slotted both ends (MA5BEF)

[ ] 2 Element Tube, 1" swaged to 7/8" x 41-1/2", slotted one end (MA5BEG)

[ ] 2 Element Tube, 7/8" x 13-1/2 " slotted one end, drill other end(MA5BEJ)

[ ] 2 MT2 Trap, 25.9 MHz

[ ] 4 Worm clamp, 7/8" to 1"

[ ] 2 Worm clamp, 1" to 1-1/4"

[ ] 2 7/8" Plastic end cap

17/12-Meter Reflector Assembly

Installation Notes: Double check all work so far against the assembly diagrams before

continuing.

Step-6. Install the HF elements on the boom: If possible, install them with the boom

resting on a flat surface to help you maintain parallel element alignment.

[ ] 4 Element-to-Boom clamp

[ ] 4 U-bolt backing plate

[ ] 4 1-1/2" ID x 3-3/4", 1/4-20 thread SS U-bolt

[ ] 8 1/4-20 Hex nut

[ ] 8 1/4" Split lock washer

Element Spacing

17/12 DE

20/15/10 DE

20/15/10 REF

29"

53"

29"

111" Total

82" - 17/12M Spacing

82" - 20/15/10M Spacing

117" Boom

60"

57"

17/12 REF

Installation Notes: Measure and mark each element location before installing the

element (see diagram above). Install the elements on top of the boom and, once

secured in place, rotate the traps so their drain holes face straight up (when the

completed antenna is installed, it will be flipped over and the drain holes will face the

ground). Refer to the Element Mounting Diagram below for details:

Element Mounting Diagram

Driven Element

1/4-20 Hex Nut (2)

1/4" Lockwasher (2)

Backing Plate

Element-to-Boom

1/4-20 x 1-1/2" x 3-3/4" U-Bolt (1)

Clamp Boom

Step-7. Install X-hats on the HF elements: Before installing X-hats, double-check all

element measurements against the diagram below and correct as needed. Also, ensure

all elements are aligned parallel to each other and the boom-to-mast plate is

perpendicular to the elements by 90 degrees:

Element-Length Diagram

Step-7. Install X-hats on the HF elements: To avoid damaging the X-hat rods, the

antenna must be elevated on saw horses or similar supports. Install X-hats using the

components listed below:

[ ] 16 41" X-hat rod

[ ] 8 26" X-hat rod

[ ] 2 24" X-hat rod

[ ] 26 X-hat Half-washer

[ ] 26 X-hat Element brackets

[ ] 26 #8 Lock washer

[ ] 26 8-32 Nut

[ ] 16 8-32 x 2" Screw

[ ] 10 8-32 x 1-3/4" Screw

X-Hat Installation Detail

8-32 x 2" Screw

Half washer

X-Hat rod (41")

Element Bracket

Element (EB)

#8 Lock Washer

8-32 Nut

Trap

X-Hat Installation Notes: Each X-hat rod is secured to its element as shown in the

installation diagram above. All 41" rods are installed on 1" tubes using 8-32 x 2" screws

and the 26" and 24" rods are installed on 7/8" tubes using 1-3/4" screws. Loosen worm

clamps and align the rods so they all form an "X" pattern when sighting down the length

of the element. Then, tighten all hardware securely. Rod locations are shown in the

placement diagram below:

X-Hat Placement Diagram

X26 X26

X41

X24

X26

X41

X24

X41

X41 X41

X41

X41 X41

20/15/10 DE

17/12 DE

20/15/10 REF

17/12 REF

MT1 MT1

MT2 MT2

MT3 MT3

MT2 MT2

Step-8. Install the Feedline Junction Box (MN6B) using the parts listed below:

[ ] 1 MN6B feed network with coax cables (80-MN6B-MB)

[ ] 1 Worm clamp, 1-1/2 to 1-3/4"

[ ] 4 #8 Lock washer

[ ] 4 8-32 Nut

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