Related Manuals for MFJ MFJ-1835H
Summary of Contents for MFJ MFJ-1835H
- Page 1 MFJ-1835H 10,12,15,17,20 METER HIGH POWER 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 2015 MFJ Enterprises Inc.
- Page 2 Introduction Thank you for purchasing the MFJ-1835H five band HF antenna. You new antenna is composed of High strength material for excellent rigidly and light weight. The MFJ-1835H 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 4 element arms 1 feed arm 5 insulators 1 matching box Parts pack Lots of Nuts and Bolts 2 rolls of element wire for each band...
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Page 4: Support Arms
Assembly Select one of the two mounting plates. Install the mount bracket onto the plate using four 6-32 x ½ screws and nuts. Make sure the nuts are on the bracket side mounting bracket 4 places holes Support arms Select one of the four element arms. Install the arm between the two plates using four 6-32 x 1 inch screws and nuts. - Page 5 Feed tube Install the feed tube using the last two holes in the plate. It does not matter which end you use. The hole patterns are the same. These holes are under the mounting bracket but it is not shown in this diagram. Feed arm mounting holes...
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Page 6: Matching Box
Matching box The matching box can now be mounted to the feed arm. Use the hole closest to the end of the tube. The other hole will not be used. Use the 6-32 locking nut to secure it to the tube. Use the nylon ties to route the coax along the tube back towards the mounting plates. - Page 7 Element Wires Now it is time to route the element wires around the antenna. Start with the 10 meter wire on the inner most loop. The 10 meter wire will be the shortest one. Attach the end with the eyelet to one side of the balun box. Route the wire around the antenna to each of the inner most holes in the support arms.
- Page 8 Tuning The antenna should already be close the correct frequency for each band. Tuning strips have been included to adjust the frequency of operation for each band. Use an SWR analyzer or transceiver with an SWR meter to determine where the antenna is tuned to.
- Page 9 Tuning option 2 Some customers have had success tuning the antenna wires simply by allowing excess wire to hang down from the insulators after looping around the bolts. Tuning adjustment is done by trimming the excess wire. The excess wire will cause the antenna to be tuned to a frequency below the band.
- Page 10 1-1/2" OD to 1-1/4" OD and with a length that will place the antenna base at a safe height. The MFJ-1835H 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 11 PART # DESCRIPTION 737-1835 8 x 8 aluminum plate 72 inchfiberglass tube 811-1835-1 811-1835-2 43 inch Fiberglass tube Matching Box 10-1835H-1 735-1835 Mounting bracket 13-1835-10 10 meter wire assembly 13-1835-12 12 meter wire assembly 15 meter wire assembly 13-1835-15 13-1835-17 17 meter wire assembly 13-1835-20 20 meter wire assembly...
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