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Balun Mounting Bracket for
COMTEK Baluns and
Wire Antennas
Patent Pending
DXE-WA-BMB
DXE-WA-BMB-INS Rev 0c
Shown with optional parts
© DX Engineering 2018
DX Engineering - 1200 Southeast Ave. - Tallmadge, OH 44278 USA
Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200
Fax: (330) 572-3279 ∙ E-mail:
DXEngineering@DXEngineering.com
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Table of Contents
Related Manuals for DX Engineering DXE-WA-BMB
Summary of Contents for DX Engineering DXE-WA-BMB
- Page 1 Patent Pending DXE-WA-BMB DXE-WA-BMB-INS Rev 0c Shown with optional parts © DX Engineering 2018 DX Engineering - 1200 Southeast Ave. - Tallmadge, OH 44278 USA Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200 Fax: (330) 572-3279 ∙ E-mail: DXEngineering@DXEngineering.com...
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Page 2: Introduction And General Information
Every effort is made to supply the latest manual revision with each product. Occasionally a manual will be updated between the time your DX Engineering product is shipped and when you receive it. Please check the DX Engineering web site (www.dxengineering.com) for the latest revision manual. -
Page 3: Parts List
Note: The following assembly instructions are based on building a typical resonant dipole for 15 meters. Optional items include a COMTEK balun, DX Engineering Antenna Wire, DX Engineering Coax Strain Relief, DX Engineering Rope, DX Engineering Coaxial Cable, suggested Never- ®... -
Page 4: Antenna Installation
A 40 Meter dipole at 70 feet is approximately 1/2-wavelength high and is likely to be good for DX and less optimal for local or short range communications. For more information on antenna design, feedline and radiation angles, consult a reliable text such as the "ARRL Antenna Book" which is available from DX Engineering. Page 4... -
Page 5: Basic Assembly
Note: The following assembly instructions are based on building a typical flat top resonant dipole for 15 meters. Optional items include a COMTEK balun, DX Engineering Antenna Wire, DX Engineering Coax Strain Relief, DX Engineering Rope, DX Engineering Coaxial Cable, suggested ®... - Page 6 When building a single band coaxial cable fed HF dipole antenna, you may easily use the formula L = 468/F to determine the overall length of the wire (L in feet, F in MHz). The formula takes into account the end-effect of the antenna wire to give you the overall length of the wire portion. As an example, using the formula L = 468/F, the overall length of a half wave dipole for 3.800 MHz would be L = 468/3.800 or 123.2 feet.
- Page 7 Trim approximately 1 inch of insulation from the two dipole wires that will connect to the COMTEK Balun. Route the dipole wire ends through the mounting bracket in a serpentine manner as shown below. Note where the wire enters the bracket through the cupped area. Loosen the connection hardware on the COMTEK balun.
- Page 8 Refer to the detailed instructions that are included with the strain relief for details on the assembly. Connect the coaxial cable (in this example DX Engineering DXE-8X (with PL-259s attached) to the bottom of the Balun. This coaxial connection should be weather proofed using the DX Engineering TES-2155 Temflex ®...
- Page 9 Wrapping and soldering is not required. Attaching Rope to the End Insulators DX Engineering Double-braided Polyester Rope SYN-DBR should be secured to the Balun Mounting Bracket and the End Insulators (depending on your installation) using a non-slip knot. The rope hole (diameter) on the Balun Mounting Bracket is 0.371"...
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Page 10: Support Line
Flat Dipole Installation between trees using a Messenger Line DX Engineering Double-braided Polyester Rope SYN-DBR is used for the messenger line by forming a loop at the mid-point of the rope. Push the loop through the Center-T top hole, and pull the rest of the rope through the loop.. - Page 11 The top support hole may also be used for rope to install it as an inverted-V. Inverted-V Dipole – Tower Side Arm Installation Tower side arm Universal Mounting Plates and Saddle Clamps are available from DX Engineering. Tuning Once the dipole is completed, raise the dipole to its operating position.
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Page 12: Technical Support
All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a period of one (1) year from date of shipment. DX Engineering’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted; no allowance shall be made for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by DX Engineering.
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