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Cushcraft
Amateur Radio Antennas
LFA-2M9EL
9 Element Loop Feed Beam
For 2 Meters
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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Summary of Contents for CUSHCRAFT LFA-2M9EL
- Page 1 Cushcraft Amateur Radio Antennas LFA-2M9EL 9 Element Loop Feed Beam For 2 Meters 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: Boom Assembly
BOOM ASSEMBLY Here are the 3 boom sections with measurements displayed for the pre-drilled holes. You won’t need these measurements, they are just there to identify the correct tube placement and orientation. Identify each tube by where the holes are. Once you have identified the tubes, determine which end of the tube will insert into the middle boom section. - Page 4 Secure the booms together with the #16 hose clamps. Don’t overtighten the clamps and remember they will probably need to be loosened when final alignment of the elements is done. 3 inches 3 inches #16 hose clamp Loop Assembly To assemble the feed loop onto the boom you will need the following parts. 2 feed loop ends 1 long 7/16 tube 2 short 7/16 tube...
- Page 5 long tube with saddle short tubes with insulator Mount the insulator on the Boom at the second hole from the rear of the antenna using the 8-32 x 2 inch bolt. Attach the two short 7/16 tubes to the insulator using the 8-32 x 1 inch bolt thru the holes in the ends of the tubes.
- Page 6 Put one hose clamp over each end of each tube. Insert the loop ends into the 7/16 tubes. Don’t force them. Keep them straight as they go in. Leave them loose for tunning the SWR later. The tubes will have enough friction to stay without the hose clamps being tightened.
- Page 7 27-5/16 29-1/8 Once you have all the elements on in the correct location, check the alignment of the elements on the boom sections. Check the distance between the elements that have boom joints between them. If the insertion depth is not correct then move the boom to make these measurements correct. Rotate the sections to align the elements if needed and retighen the clamps.
- Page 8 Attach your coax to the feed loop using the remaining 8-32 nuts and lock washers. Make the distance of the exposed conductors as short as possible. Seal this connection using a appropriate sealant to prevent water from entering the coax. Wind a choke balun into the coax using a household cleaner or spray paint can.
- Page 9 Tape coax to boom and mast when mounted at its final loacation The antenna is now ready for mounting on your pole or tower. Route the coax along the boom and mast. Secure it using cable ties or electrical tape. Check the antenna over one last time to make sure everything is in place and secure.
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