CUSHCRAFT MA6B Manual
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CUSHCRAFT MA6B Manual

CUSHCRAFT MA6B Manual

2 element compact beam. for 6-20 meters.
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Summary of Contents for CUSHCRAFT MA6B

  • Page 2 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.
  • Page 3 MA6B Parts List: Quan Part # Description 21/28 MHz driven element trap assembly 24.9 MHz trap assembly 21/28 MHz reflector element trap assembly 80-MN6B-MB Feed network with coax cables MA5BEF Element Tube, 1-1/8" OD x 84", slotted both ends MA5BEE Element Tube, 7/8"...
  • Page 4 8-32 x 1-3/4" Screw Step-1. Assemble the boom using the parts listed below: Boom Tube, 1-1/2" OD x 48", slotted one end (20-MA6B-BC) Boom Tube, 1-1/2" OD x 21", slotted both ends (20-MA6B-BD) Boom Tube Insert, 1-3/8" OD x 48" (20-MA6B-BE) Worm clamp, 1-1/4"...
  • Page 5 Top View, Mast-to-Boom Plate Installation 5/16" x 18 Nut (4) 5/16" Lockwasher (4) 57" mark Boom-to-Mast Plate (1) Boom 3" U-Bolt (2) Step-2. Assemble the 20/15/10-Meter Driven Element using parts listed below: Element Tube, 1-1/8" OD x 34", slot one end, drilled other end (MA5BEA) Element Tube, 1"...
  • Page 6 Step-3. Assemble the 17/12-Meter Driven Element using parts listed below: Element Tube, 1-1/8" OD x 46", slot one end, drilled other end (MA5BED) Element Tube, 1" swaged to 7/8" x 36", slotted one end (MA5BEB) Element Tube, 7/8" OD x 12" slotted one end (MA5BEE) Trap, 24.9 MHz driven element, MT2 Driven-element insulator, fiberglass, 1"...
  • Page 7 Step-5. Assemble the 17/12-Meter Reflector using the parts listed below: Element Tube, 1-1/8" OD x 84", slotted both ends (MA5BEF) Element Tube, 1" swaged to 7/8" x 41-1/2", slotted one end (MA5BEG) Element Tube, 7/8" x 13-1/2 " slotted one end, drill other end(MA5BEJ) MT2 Trap, 25.9 MHz Worm clamp, 7/8"...
  • Page 8 Element Spacing 17/12 REF 3" < > 29" 20/15/10 REF < > 117" Boom 111" Total 57" 82" - 17/12M Spacing 82" - 20/15/10M Spacing 60" 53" 17/12 DE < > 29" 20/15/10 DE < > 3" Installation Notes: Measure and mark each element location before installing the element (see diagram above).
  • Page 9 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: 41" X-hat rod 26" X-hat rod 24" X-hat rod X-hat Half-washer X-hat Element brackets #8 Lock washer...
  • Page 10 X-Hat Placement Diagram 17/12 REF < > 20/15/10 REF < > 17/12 DE < > 20/15/10 DE < > Step-8. Install the Feedline Junction Box (MN6B) using the parts listed below: MN6B feed network with coax cables (80-MN6B-MB) Worm clamp, 1-1/2 to 1-3/4" #8 Lock washer 8-32 Nut...
  • Page 11 Step-9. Install the Six-Meter Driven Element: The six-meter driven element is installed “piggyback” in parallel with the 17/12-meter driven-element. Use the parts listed below: Element tube, 7/16" OD x 48", (20-MA6B-DD). Element tube, 3/8” OD x 9" (20-MA6B-DE). Element mounting bracket, supports driven element Insulating plate, supports 7/16”...
  • Page 12 Step-10. Install the Six-Meter Reflector Element using the parts listed below: Element Tube, 7/16” OD x 72", slotted ends, drilled center (20-MA6B-EG) Element Tube, 3/8" OD x 28" (20-MA6B-EH) Insulator Plate, ¼” x 2-1/2” x 3-1/2”...
  • Page 13 115" total Important Note: Prior to installing the MA6B on a mast, check all hardware and worm clamps to confirm everything is properly aligned and tight. Also, check trap orientation -- drain holes must face the ground when the antenna is flipped over and installed on the mast.
  • Page 14 5/16" Lockwasher (4) 5/16" x 18 Nut (4) In Case of Trouble: The MA6B should exhibit low in-band SWR readings. If the lowest (minimum) SWR reading you can measure on any band is over 1.5:1, or if the minimum SWR reading occurs outside the band, check the potential causes listed below: [ ] Antenna too close to ground, metal roof, house wiring, gutters, foil-insulation, etc.
  • Page 15 Typical MA6B Specifications: Spec 20-M 17-M 15-M 12-M 10-M F/B Ratio 18-dB 20-dB 12-dB 16-dB 10-dB 20-dB Gain dBd +3.6 +4.7 +4.8 +4.9 +5.3 +5.5 Min SWR 1.15 Power Rating: 1200-W ICAS SSB/CW, 350W AM/FM/RTTY/Digital Elements: 6 (2 per band) Longest Element: 17' - 1"...

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