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Cushcraft
Amateur Radio Antennas
LFA-2M12EL
12 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-2M12EL
- Page 1 Cushcraft Amateur Radio Antennas LFA-2M12EL 12 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 IDENTIFICATION Here are the 5 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.
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Page 4: Boom Assembly
BOOM ASSEMBLY Place a #16 hose clamp over the tube before inserting next section Hose clamp Middle Boom Section 5.75 38.75 1-1/2 X .058 X 72 WITH INSERT 2 HOLES 1-3/8 X .058 X 65 Note this hole toward rear of boom Rear Mid boom section SLOT Front Mid Boom Section... - Page 5 Long tube with saddle Rear of Antenna Element saddle and half washer. short tubes with insulator 8-32 x 2 8-32 nut #8 lock washer 7/16 X 14-1/2 7/16 X 14-1/2 Mount the insulator on the Boom at the second hole from the rear of the antenna using the 8-32 x 2 inch bolt.
- 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 3/16 ELEMENT ROD LENGTHS Color code chart AND COLORS BLACK BROWN R1 41 INCH BROWN R2 38.15 INCH RED ORANGE R3 35.54 INCH ORANGE YELLOW R4 36.79 INCH YELLOW GREEN R5 36.54 INCH GREEN BLUE R6 36.08 INCH BLUE VILOET R7 35.33 INCH VIOLET GREY R8 34.79 INCH GREY...
- 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 Antenna shown in vertical position for Illustration only. 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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