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INSTRUCTION MANUAL
179893
CAUTION: Read All Instructions Before Operating Equipment
VERSION 1A
Cushcraft
Amateur Radio Antennas
LFA-6M8EL
6 Meter 8 Element Loop Feed Antenna
Cushcraft
Amateur Radio Antennas
308 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-9538 Fax: 662-323-6551
170424
175661
170410
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Summary of Contents for CUSHCRAFT LFA-6M8EL
- Page 1 Cushcraft Amateur Radio Antennas LFA-6M8EL 6 Meter 8 Element Loop Feed Antenna INSTRUCTION MANUAL 179893 170424 175661 170410 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...
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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 FIRST BRACKET Inches from rear of boom 1 INCH FROM to back of bracket END OF BOOM #12 bracket Assemble the brackets as shown in Figure 2 and #13 bracket with insulator locate them on the boom assembly as shown in #12 bracket Figure 3.
- Page 5 Install boom caps 172928 7/16 x 53 inches 59 INCHES 175512-1 Identify the element tubes by their total 49-1/2 INCHES length given on the left side of the diagram. Instal the tubes in the locations shown. 175512-1 7/16 x 42-3/4 inches Don’t tighten loop clamps The element lengths are given from the until final tuning is done...
- 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 Place the clamp next to the 351244 378208 boom section bolt.
- Page 7 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.
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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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