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Summary of Contents for CUSHCRAFT LFA-6M7EL
- Page 1 Cushcraft Amateur Radio Antennas LFA-6M7EL 6 Meter 7 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 Assembly of the Boom figure 1 Slide the boom insert into boom ends, as shown in Figure 1. Select the boom-to-mast bracket and clamp parts. Loosely assemble them on the boom ends. 5/16 x 5 Secure the boom ends and brackets together with 102734 four (4) 1/4"-20 x 3/4"...
- Page 4 Inches from rear of boom to back of bracket 3 inches #12 bracket Assemble the brackets as shown in Figure 2 and locate them on the boom assembly as shown in #13 bracket Figure 3. It is easier to assemble the brackets on with insulator the boom at the correct location, rather than try to slide them on the boom.
- Page 5 Install boom caps 58-3/8 INCHES 172928 7/16 x 53 inches Identify the element tubes by their total length given on the left side of the diagram. 175512-1 Instal the tubes in the locations shown. The element lengths are given from the 49-1/2 INCHES center of the boom to the tip of the tube.
- Page 6 Chain link 351244 Turnbuckle 351243 358731 Tape one end of the cable to the chain link with electricians tape. 5/16 x 1-5/8 Make a sufficient number of wraps, then wrap with electricians tape. 1/4-20 x 3/4 Chain link 351244 Place the clamp next to the 378208 boom section bolt.
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Page 7: Feed Line Connection
5-3/4” FEED LINE CONNECTION To RF Choke Connect your feed line as shown in the diagram. One side of the driven element Coax Stripping 5” 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 #13 bracket. -
Page 8: 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 11: Parts List
PARTS LIST DESC 172928 7/16 tube 175512 7/16 tube 174865 7/16 tube 172922 7/16 tube 102734 mast brick 172732 mast clamp 172735 mast plate 455625 2" CAP 505266 1/4-20 X 3/4 BOLT 554099 1/4-20 NUT HEX 551367 1/4-20 NUT SQUARE 500156 1/4-20 X 3/8 BOLT 562961...
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