{"id":8096,"date":"2016-06-16T00:29:13","date_gmt":"2016-06-16T05:29:13","guid":{"rendered":"http:\/\/sanantoniohams.org\/blog\/?p=8096"},"modified":"2016-06-16T00:33:13","modified_gmt":"2016-06-16T05:33:13","slug":"back-packing-antenna-for-40-and-20-meters","status":"publish","type":"post","link":"http:\/\/sanantoniohams.org\/blog\/?p=8096","title":{"rendered":"BACK PACKING ANTENNA FOR 40 AND 20 METERS"},"content":{"rendered":"
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W2IK LADDER LINE BACK PACK ANTENNA<\/span><\/strong><\/div>\n
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\u00a0\u00a0\u00a0\u00a0 GREAT FOR CAMPING OR EMERGENCY COMMUNICATIONS<\/b><\/span><\/div>\n<\/td>\n
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BOB HEJL – W2IK<\/i><\/b><\/span><\/div>\n<\/td>\n
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EVER WISH YOU HAD A VERY SIMPLE, LIGHT WEIGHT HAM RADIO ANTENNA THAT COULD BE STUFFED IN<\/span>\u00a0YOUR BACKPACK AND DOES NOT NEED A TUNER? HERE IS A SIMPLE DESIGN THAT I BUILT MANY YEARS<\/span>\u00a0AGO AND FOUND IT TO BE VERY USEFUL WHILE CAMPING OR FOR EMERGENCY COMMUNICATIONS. IT’S<\/span>\u00a0GREAT IF YOU DON’T HAVE THE ABILITY TO TAKE ALONG MY\u00a0<\/span><\/span>“IK-STIC<\/span>\u00a0<\/span>2″<\/span><\/a>ANTENNA<\/span><\/a>\u00a0<\/span>(TO BUILD THAT\u00a0<\/span><\/span>ANTENNA, SEE ANOTHER POSTING ON THIS SITE.<\/span><\/span><\/div>\n<\/td>\n
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WHEN YOU ARE CAMPING, YOU HAVE TO MAKE COMPROMISES. THE SAME IS TRUE ABOUT CAMPING<\/span>WITH HAM RADIO. USUALLY YOU’LL BE OPERATING ON 20 METERS IN THE DAY AND 40 METERS AT NIGHT.\u00a0<\/span><\/span>THAT BEING SAID, I DEVISED A VERY SIMPLE ANTENNA IN A SINGLE FORM THAT WILL COVER BOTH\u00a0<\/span><\/span>BANDS\u00a0<\/span><\/span>WITHOUT THE NEED FOR A TUNER.<\/u><\/span><\/div>\n<\/td>\n
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TO BUILD THIS ANTENNA YOU WILL NEED<\/u><\/b><\/span><\/div>\n
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50 FEET OF 450 – 600 OHM LADDER LINE (NOT TWIN LEAD)<\/b><\/span><\/div>\n
2 THREE INCH PIECES OF 1\/2 INCH PVC TUBING<\/b><\/span><\/div>\n
ONE CENTER CONNECTOR (DIPOLE TYPE-WIRE TO SO-239 CONNECTOR)<\/b><\/span><\/div>\n<\/td>\n
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UNROLL THE COIL OF LADDER LINE AND CUT THE LADDER LINE IN HALF SO YOU HAVE TWO LENGTHS\u00a0<\/span><\/span>EXACTLY 25 FEET LONG. \u00a0 EACH LENGTH BECOMES A SIDE OF YOUR DIPOLE SYSTEM. AT THE EVERY\u00a0<\/span><\/span>END OF EACH WIRE, STRIP OFF THE INSULATION EXPOSING ABOUT 4 INCHES OF BARE WIRE. ON ONE\u00a0<\/span><\/span>SIDE OF EACH LADDER LINE TWIST THE BARE WIRES TOGETHER AND SOLDER ONE END OF EACH\u00a0<\/span><\/span>LADDER LINE TO THE WIRES ON THE CENTER CONNECTOR.<\/span><\/div>\n
\u00a0(SEE PICTURE BELOW)<\/span><\/div>\n<\/td>\n
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AT THE OTHER END OF EACH OF THE LENGTHS OF LADDER LINE, TAKE ONE PIECE OF 1\/2 INCH PVC<\/span>TUBE AND SLIDE THE WIRES THROUGH 1\/4 INCH HOLE DRILLED NEAR ONE END OF THE PVC TUBE. PULL\u00a0<\/span><\/span>THE PVC AROUND SO YOU CAN CONNECT THE WIRES TO EACH OTHER AND SOLDER THEM TOGETHER<\/u>.<\/span><\/div>\n
(SEE PHOTO OF THE ONE OF THE TWO END INSULATORS BELOW)<\/strong><\/span><\/div>\n
DRILL ANOTHER 1\/4 INCH HOLE ON THE OTHER END OF THE PVC TUBE SO YOU CAN HANG THE DIPOLE\u00a0<\/span><\/span>SYSTEM UP USING NYLON CORD.<\/span><\/div>\n<\/td>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 THE SPECIAL CUT<\/span><\/strong><\/u><\/span><\/div>\n<\/td>\n
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NOW JUST ONE MORE THING TO DO. IN ORDER TO MAKE THIS A 40 AND 20 METER ANTENNA, YOU NEED\u00a0<\/span><\/span>TO MEASURE 16.4 FEET FROM THE MIDDLE OF THE CENTER CONNECTOR AND ON ONE WIRE OF <\/span>EACH\u00a0<\/span><\/u><\/span>SIDE OF THE LADDER LINE YOU WILL CLIP OUT A 1\/4 INCH SECTION OF WIRE. IF POSSIBLE, CLIP THE\u00a0<\/span><\/span>SECTION OUT WHERE THERE IS A SEPARATING PIECE OF THE LADDER LINE WEBBING SO THE ANTENNA\u00a0<\/span><\/span>WILL BE PHYSICALLY MORE STABLE.<\/span><\/div>\n
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\u00a0THIS WILL LEAVE YOU WITH TWO ANTENNAS IN ONE SYSTEM. ONE ANTENNA’S TOTAL DIPOLE LENGTH\u00a0<\/span><\/span>IS 32.8 FEET (16.4 FEET ON EACH DIPOLE LEG) OR A 20 METER DIPOLE, AND THE OTHER IS THE 40 METER\u00a0<\/span><\/span>DIPOLE AS THE WIRE IN LADDER LINE YOU DIDN’T CLIP WILL NOW RUN THE ENTIRE LENGTH OF EACH\u00a0<\/span><\/span>SIDE, CONTINUE AROUND THE END INSULATORS AND CONTINUE IN A HAIRPIN \u00a0RUN AROUND TO THE\u00a0<\/span><\/span>OTHER (LOWER) SIDE OF THE LADDER LINE ON THAT SAME SIDE MAKING A LENGTH OF ABOUT 66.8 FEET\u00a0<\/span><\/span>TOTAL OR 33.4 FEET ON EACH LEG (LESS THAN THE MATH OF JUST ADDING AND SUBTRACTING BECAUSE\u00a0<\/span><\/span>YOU LOST LENGTH WHEN YOU SOLDERED THE WIRES THAT ARE IN THE END CONNECTORS) THIS IS FINE\u00a0<\/span><\/span>FOR A 40 METER DIPOLE.<\/span><\/div>\n
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\u00a0THERE IS JUST A LITTLE INTERACTION WITH THE TWO ANTENNAS SO CLOSE TOGETHER. IF YOU WISH TO\u00a0<\/span><\/span>BE REALLY FUSSY, YOU MAY WANT TO DO THE WIRE CLIP ACTION AND CHECK THE TUNING USING AN\u00a0<\/span><\/span>ANTENNA ANALYZER. IF THIS IS THE CASE, DO NOT CLIP OUT A 1\/4 INCH PIECE YET, JUST CLIP THE WIRE,\u00a0<\/span><\/span>MEASURE THE SWR WITH THE ANTENNA HUNG AND MAKE ANY CORRECTIONS (DO THIS BY<\/span>RESOLDERING THE CUT YOU MADE AND MAKE ANOTHER CUT DEPENDING UPON THE ANTENNA’S<\/span>RESONANT FREQUENCY). ALTHOUGH THIS ANTENNA IS NOT AS EFFICIENT ON 40 METERS AS A DIPOLE<\/span>STRUNG OUT INSTEAD OF FOLDED, I HAVE USED THIS ANTENNA ON MANY OUTINGS WITH GREAT<\/span>RESULTS AND IT IS MORE CONVIENT TO PUT UP OR STORE. YOU CAN EASILY COIL IT UP AND STORE IN<\/span>YOUR BACK PACK. IT CAN BE PUT UP AS A DIPOLE, SLOPER OR INVERTED “V”. MAKE SURE YOU HAVE<\/span>NON-CONDUCTING CORD TO HANG IT UP. AND BY THE WAY, SINCE THE 40 METER SECTION LOOPS<\/span>AROUND, ALL YOU NEED IS 52 FEET BETWEEN TREES TO HANG THIS ANTENNA AS A DIPOLE!!!<\/span><\/div>\n<\/td>\n
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LADDER LINE ANTENNA<\/i><\/span><\/div>\n
COILED UP FOR STORING IN A<\/i><\/span>BACK PACK SO IT CAN BE USED<\/i><\/span>WHILE HIKING OR CAMPING<\/i><\/span><\/div>\n<\/td>\n
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ALL DESIGNS COPYRIGHTED<\/b><\/span><\/div>\n
BY W2IK – BOB HEJL<\/b><\/span><\/div>\n
MY NOT BE USED WITHOUT<\/b><\/span><\/div>\n
AUTHOR CREDIT<\/b><\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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W2IK LADDER LINE BACK PACK ANTENNA \u00a0\u00a0\u00a0\u00a0 GREAT FOR CAMPING OR EMERGENCY COMMUNICATIONS \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 BOB HEJL – W2IK EVER WISH YOU HAD A VERY SIMPLE, LIGHT WEIGHT HAM RADIO ANTENNA THAT COULD BE STUFFED IN\u00a0YOUR BACKPACK AND DOES NOT NEED A TUNER? HERE IS A SIMPLE DESIGN THAT I BUILT MANY YEARS\u00a0AGO AND FOUND IT […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[22,349,737,19,4,14],"tags":[],"_links":{"self":[{"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8096"}],"collection":[{"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8096"}],"version-history":[{"count":5,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8096\/revisions"}],"predecessor-version":[{"id":8101,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8096\/revisions\/8101"}],"wp:attachment":[{"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8096"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/sanantoniohams.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}