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Summary of Contents for CUSHCRAFT LFA-6M4EL
- Page 1 Cushcraft Amateur Radio Antennas LFA-6M4EL 6 Meter 4 Element Loop Feed Antenna INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment Cushcraft Amateur Radio Antennas 308 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-9538 Fax: 662-323-6551 VERSION 1A...
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Page 2: General Description
GENERAL DESCRIPTION The LFA (Loop Fed Array) Low-Noise Yagi is very different from the traditional dipole fed Yagi in many ways with its primary benefit being unwanted noise rejection. The LFA has a rectangular shaped, full wave loop driven element that is laid flat on the boom between and in-line with the parasitic elements . Then there is the way in which the loop functions. - Page 3 555747 Assembly of the Boom 564792 Assembly Instructions 562961,554099 Select the boom-to-mast clamp, (385142-1) the boom-to-mast bracket (385144-1) and four (4) 1/4" - 20 x 3/4" bolts (505266) four (4) internal lockwashers (562961) and four (4) 1/4" hex nuts (554099) 540067 385144-1 Place the boom-to-mast bracket (385144-1)
- Page 4 Inches from rear of boom Assemble the brackets as shown in Figure 2 and Install boom caps to back of bracket locate them on the boom assembly as shown in 2” #11 bracket Figure 3. It is easier to assemble the brackets on the boom at the correct location, rather than try 190002 to slide them on the boom.
- Page 5 59-3/4 INCHES 172928 7/16 x 53 inches Instal the tubing in the locations shown. The tubing can be identified by the lengths Don’t tighten loop clamps given on the left side of the diagram. until final tuning is done This is the total length of the tube. 175512-1 7/16 x 42-3/4 inches The element lengths are given from the center of the boom to the tip of the tube.
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Page 6: Feed Line Connection
FEED LINE CONNECTION Connect your feed line as shown in the diagram. One side of the driven element is connected to the center conductor of the coax and the other is connected to the shield. Route the conductors so that they do not touch the #1 bracket. -
Page 7: Final Tuning
FINAL TUNING Start by making sure the distance from the loop end to the center of the boom on one side is the same as the distance on the other side. These distances must be the same. If you move one, you must move the other. - Page 8 NOTES...
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Page 11: Parts List
PARTS LIST DESC 172928 7/16 tube 53 175512-1 7/16 tube 42.750 174865 7/16 X 48 172922 7/16 tube 47 161422 #11 bracket 165138 #1 bracket 505266 1/4-20 X 3/4 BOLT 554099 1/4-20 NUT HEX 555693 1 0-24 NUT SQUARE 500158 1 0-24 X 1/2 BOLT 562961 1/4 LOCK WASHER...
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