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12188

KLM 2M-14C CIRCULAR POLARIZED ANTENNA

ASSEMBLY TEXT

April 22, 1985

P.O. Box 816, Morgan Hill, California 95037 • (408) 779-7363

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Summary of Contents for 2M-14C

Page 1: ...12188 KLM 2M 14C CIRCULAR POLARIZED ANTENNA ASSEMBLY TEXT April 22 1985 P O Box 816 Morgan Hill California 95037 408 779 7363 ...

Page 2: ...al communications where signals fixed and mobile are disturbed by buildings movement mountains and or the earth s curvature Under these conditions circular wavefronts are also developed and compared with a linear polarized antenna a user of the 14C will enjoy less flutter fading less multipath distortion and possibly better S N ratios Benefits on transmitting are similar Built to last built to per...

Page 3: ...dware as is a marking pen for identifying components 2 Some simple tools are required a tape measure screwdriver and a set of spintite socket or end wrenches Common nut sizes are 5 16 6 32 hardware 7 16 1 4 20 hardware 11 32 8 32 hardware 1 2 5 16 18 hardware To avoid damage to antenna components be aware that most hardware needs only be moderately hand tightened with screwdriver or spintite to be...

Page 4: ...a letter in felt pen Assemble boom sections matching like letters A to A etc and aligning screw holes Each joint requires two sets of 8 32 x 1 3 4 screws lock washers and nuts Hand tighten nuts securely Section placement and length will follow the sketch below 2 Mount 1 steel clip to right side of boom when viewed from rear using the hole 25 1 2 from rear Secure with 6 32 x 1 3 4 hardware DRIVEN E...

Page 5: ...y with the insulator oriented on the underside of boom Add an additional lock washer and nut to the mounting screw to provide an even platform for mounting the PC board 4 Place the PC board onto the horizontal dipole studs first then add the coax balun leads lugs on feedpoints strap on mounting stud Secure with three sets of 8 32 flat washers lock washers and nuts 5 Place the SO 239 case into the ...

Page 6: ...rod director in the next hole and the next and the next until all the rod directors are in place Now return to the reflector and slide on the second button insulator from the opposite side of the boom Visually center the element in the boom Consult the antenna Dimension Sheet and using a tape measure set the element position so the element is centered in the boom THIS CENTERING OPERATION IS VERY C...

Page 7: ...6 DIMENSION SHEET KLM 2M 14C ELEMENT SPACING FEET INCHES FROM ELEMENT LENGTHS IN INCHES BOOM REAR X X FEEDPOINTS For 50 ohm feedline each set of feedpoints has an RG 142 4 1 Coax Balun rated at 2 KW PEP ...

Page 8: ...embly pictorial From this point tape or strap feedline and DC line together to aid in routing 3 Attach the 4 x 6 boom to mast plate as close to the balance point as possible Keep plate at least 1 2 from elements Secure with 1 1 2 U bolts 4 The 14C like any antenna with vertical elements MUST BE MOUNTED ON A NON CONDUCTIVE MAST Thick wall fiberglass tubing is ideal available from KLM although hardw...

Page 9: ...aid lug to insulator mounting screw stud Attach center conductor lug to either of the feedpoint studs 2 Stacking with other antennas Keep 14C at least 80 from 2 meter antennas 40 from non resonant antennas Keep element tips at least 1 4 wave 20 144 MHz from other antenna element tips or metallic objects 3 Always use high quality coax for your feedline s and eliminate one possible source of losses ...

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Page 11: ...un 2 Assembly Manual 84041 1 Hardware Bag 1 1 U Bolts and Cradles 1 1 2 28401 4 Hardware Bag 2 1 Screws 6 32 x 1 3 4 28008 1 Nut 6 32 28201 1 Lock washer 6 28351 1 Screws 8 32 x 1 28031 4 Screws 8 32 x 1 3 4 28016 4 Screws 8 32 x 3 28020 2 Nuts 8 32 28202 18 Flat washers 8 28302 8 Lock washers 8 28352 18 Nuts 5 16 18 28206 8 Lock washers 5 16 28356 8 Large Nylon Ties 66119 8 Type II Insulator 3 8 ...

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