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MFJ-1838
6,10,12,15,17,20,30,40 METER
HD
COBWEB ANTENNA
INSTRUCTION MANUAL
CAUTION: Read All Instructions
Before Operating Equipment
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-5869 Fax: 662-323-6551
COPYRIGHT
2018 MFJ Enterprises Inc.

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  • Page 1 MFJ-1838 6,10,12,15,17,20,30,40 METER COBWEB ANTENNA INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2018 MFJ Enterprises Inc.
  • Page 2 Introduction Thank you for purchasing the MFJ-1838 eight band HF antenna. You new antenna is composed of High strength material for excellent rigidly and light weight. The MFJ-1838 is compact and excellent for restricted space or portable installations. The antenna is omnidirectional enough to not require a rotator.
  • Page 3 In the box 2 mounting plates 1 mounting bracket 1 u-bolt bracket 4 x 1” 4 x 1-1/4” element arms element arms 1 matching box 1 feed arm 8 insulators 1 support arm Parts pack Lots of Nuts and Bolts 1 roll of element wire for each band 1 bundle of dacron rope...
  • Page 4 Assembly Select one of the two mounting plates. Install the mount bracket onto the plate using four 10-24 x ½ bolts split washers and nuts. Make sure the nuts are on the bracket side. mounting bracket holes Flap down 10-24 x ½ 6 places Support arms Select one of the four larger (1-1/4”...
  • Page 5 Install the smaller one inch tubes into the larger tubes. Align the holes and install the 1/4-20 bolt, washer and nylon lock nut as shown. 4 places...
  • Page 6 Matching box The matching box can now be mounted to the feed arm. Use the 6-32 nylon locking nut to secure it to the tube. Use the nylon ties to route the coax along the tube back towards the mounting plates. Mounting plate Mounting plate Now would be a good time to mount the antenna...
  • Page 7 The wire guides are assembled as shown below. Use a 5/16 nut driver or a flat head screwdriver to unscrew hose clamp and insert band through the two slotted holes. Note that one hole in the ABS plastic is larger than the rest. This is to allow an eylet to pass through the hole if needed.
  • Page 8 Assemble the rope ring support as shown. Two of the square pieces are used for greater strength. The assembly will fit snug into the support tube. Measure distance A before inserting it into the tube. Drive a self tapping #6 screw into the tube just above the bottom washer.
  • Page 9 Each band has a single wire with eyelets on each end. Start with the 10 meter wire and each band after that will be the same procedure. Unroll the wire and find the center by folding in half. Have someone hold the ends with eyelets or hook them over something. Be careful not to kink the wire.
  • Page 10 Make sure insulator is centered with mast plate Loop wire through eyelet and around itself three times. Allow excess to hang downward. Looping the wire around itself tightly is more than enough to hold the wire in place on the insulator.
  • Page 11 Wire guides 6 meters should be tuned the same way except the ends of the wire terminate at one of the wire guides. Loop the wire around one of the holes of the wire guide and leave some hanging off. The wire guide next to the mast plate can be moved where needed to make the 6 meter element as long or as short as needed.
  • Page 12 1-1/2" OD to 2" OD and with a length that will place the antenna base at a safe height. The MFJ-1838 is designed to operate at a height of 10 or more feet for proper performance. Placement on the side of a house or garage at eaves level is acceptable as long as the wires will not be in contact with anything.
  • Page 15 6. Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned. Wired and tested PC boards installed in the owner’s cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, Inc. will be returned at the owner’s expense unrepaired.

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