Building a Doublet Aerial. Post 1829.
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The classic multiband HF doublet antenna is a surprisingly effective antenna which is easy and fairly inexpensive to make. Fed with balanced feedline and connected to a balun/"tuner" combination, the doublet will let you cover any amateur radio band between 160 and 6 meters. Just cut the antenna for the lowest frequency of use and you're on the way to a decent, high performance antenna which won't close out your credit card.
In this video, "One Time Pad" takes us through the entire design, construction, tuning, and use process. Here us the list of materials needed to make this antenna reality:
"Antenna Components: Copper wire for radiating element (I used multi –strand Flexweave) Ladder line/Open wire/Ribbon (I used 300Ω ribbon because its neater) x3 eye bolts with associated nuts as washers x1 straight wastewater pipe connector x2 access plugs for above wastewater pipe connector x2 wing nuts and bolts x2 Dog bone Isolators (to isolate end of each antenna leg) x1 spool Rosin core solder (i.e. solder with embedded flux) Cable ties Heat shrink tubing Mast Components: You will need to determine your mast location in advance. You will also need to determine where each (equally sized) leg of your antenna will end and then identify to what you will fix them to. Remember, the legs have to be electrically isolated wherever they terminate. x1 antenna mast (may take more than one section to reach desired height) x2 sets T & K wall brackets (to mount mast) Fixing bolts and Rawl plugs for above brackets U Bolts to fix mast to brackets x1 long bolt to act as antenna boom with fixings to hold pulley x1 Pulley x1 carabineer x1 rope/cord to hoist antenna Fixings to anchor dog bone isolators (dependent on situation) Tools: Screwdrivers (manual/electric) Spanners Socket set/torque wrench Drill (with selectable hammer action) Drill bits for metal (for work on mast) Drill bits for concrete/brick (for mounting mast brackets) Drill stand (with vice) Soldering Iron (need minimum 40W to do large gauge antenna wire) Heat gun (for heat shrink tubing) Permanent marker (for marking antenna length etc) Stanley knife Small file Safety googles Remember Be safe! I needed help with ladders etc. http://southdublinradioclub.weebly.com"
Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).