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Related Manuals for MFJ MFJ-1890
Summary of Contents for MFJ MFJ-1890
- Page 1 MFJ-1890 2 Element Moxon Beam for 10 meters INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-9715 Fax: 662-323-6551 COPYRIGHT 2012 MFJ Enterprises Inc. Rev 1A...
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Page 2: General Description
GENERAL DESCRIPTION The Moxon Rectangle is a close-spaced 2-element Yagi consisting of a driven element and a reflector with the element tips folded toward each other to reduce turning radius. The Moxon features a broad cardioid pattern with roughly 3.3 dBd of foward gain and front to back ratio measuring -30 dB or more. -
Page 3: Permanent Installation
The use of soft or thin wall mast is not recommended. Portable Operation The MFJ-1890 may be easily transported to temporary locations for portable, emergency, and contest operation. Even for temporary or portable operation, do not be casual about selecting a suitable mast. If the antenna falls, it can be damaged and may cause serious injury. - Page 4 Install the 5/8 elements into the bracket while it is loose on the boom. Tighten them enough to hold the element but allow for the bracket to rotate on the boom as you will have to align the elements with the mast when the antenna is fully assembled. Figure 2 Secure the driven element insulator to the other end of the boom also allowing 3 inches from the center of the bracket to the end of the boom.
- Page 5 Reflector element Short side on Driven element Driven element Figure 4 Install the end pieces onto the elements using the #4 hose clamps. Sliding these end pieces in and out will be how you adjust the final length of each element. Measure the distance from the center of the boom to the outside of the element.
- Page 6 6-1/4” 20-1/2” 28-1/2 7/16 x .028 x 18 7/16 x .028 x 26 3/8 x 9” DIRECTION OF RF ENERGY 3” 3” 55-1/4” Figure 6...
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Page 7: Final Assembly
Connect the coax balun to a high quality low loss cable such as LMR-400 or equivalent. SWR Check Resonance can be checked with an MFJ-256 or MFJ-269. Alternately a transceiver and SWR meter can be used. Resonance may be changed by adjusting the length of the elements. -
Page 8: Parts List
Rod, Fiberglass 3/8 x 9” ------------------------------------------- 13-1890-1 Balun Assembly ------------------------------------------------------ 161422 Bracket, # 11 --------------------------------------------------------- 165138 Bracket, # 1 ---------------------------------------------------------- 17-1890-1 Parts Pack MFJ-1890 745-3104S Hose Clamp #4 ------------------------------------------------------ 461057 Insulator 1-1/4- 5/8 ------------------------------------------------ 171329 Clamp, 5/8 ------------------------------------------------------------ 455630 Caplug, 1-1/4 ABS ------------------------------------------------... - Page 11 NOTES...
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Page 12: Full 12 Month Warranty
MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.