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#1
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Hello,
As my 40 m. rotable dipole (2* 7 m. = 42 feet with coals) was damaged by the storm I am thinking to make something different. The dipole height was at 40 feet. I can increase the heigth with a pipe to 60 feet and make a 80m. dipole 2 * 20 m. (120 feet) Inv. V. (West/East) and a 40 meter dipole 2 * 10m ( 60 feet) or a doublet of 88 feet (South/North)? Both with ladder line. I mainly work on 80/40 and 30 m. the other bands are nice to have. The question is should I make the 40 m. dipole or the doublet or renew the old rotable dipole? Or any other suggestions.. 73 pa3glf |
#2
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Check out w4rnl at cebik . com he is a proponent of the 88 foot doublet.
I have a 90 foot doublet, as that is what my trees provided for. An advantage is that it is a 1/2 wave on 60 meters so I don't have to adjust my calculations for erp on that band. In order to tune the 90 footer which is fed by about 50 feet of 450 ohm line, I had to make a modification to my Johnson Matchbox. I could have altered the feed line length, but I chose not to. I use the doublet on 80 through 10, and it does what the models say it should at the low hieght (28 feet) that I have it. Since I am not worried about directionality, I have considered going to a 132 foot dipole when I can consider a way to suport it. KA9CAR "Dick" wrote in message ... Hello, As my 40 m. rotable dipole (2* 7 m. = 42 feet with coals) was damaged by the storm I am thinking to make something different. The dipole height was at 40 feet. I can increase the heigth with a pipe to 60 feet and make a 80m. dipole 2 * 20 m. (120 feet) Inv. V. (West/East) and a 40 meter dipole 2 * 10m ( 60 feet) or a doublet of 88 feet (South/North)? Both with ladder line. I mainly work on 80/40 and 30 m. the other bands are nice to have. The question is should I make the 40 m. dipole or the doublet or renew the old rotable dipole? Or any other suggestions.. 73 pa3glf |
#3
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"Dick" wrote in message ...
Hello, As my 40 m. rotable dipole (2* 7 m. = 42 feet with coals) was damaged by the storm I am thinking to make something different. The dipole height was at 40 feet. I can increase the heigth with a pipe to 60 feet and make a 80m. dipole 2 * 20 m. (120 feet) Inv. V. (West/East) and a 40 meter dipole 2 * 10m ( 60 feet) or a doublet of 88 feet (South/North)? Both with ladder line. I mainly work on 80/40 and 30 m. the other bands are nice to have. The question is should I make the 40 m. dipole or the doublet or renew the old rotable dipole? Or any other suggestions.. 73 pa3glf If it were me, I'd probably parallel 80 and 40 dipoles on the same feedline using coax. 30 meters I would either use a tuner, or add a 30m dipole also in parallel for that band if you don't want the tuner. If ladder line fed, it doesn't matter a whole lot, but I'd make the dipole as close to 80m size as possible. I'd probably use a full size 80m dipole, and feed as two half waves on 40, and whatever on 30. I prefer coax fed though. More efficient overall being you need no tuner or matching devices. You also get a normal dipole pattern for each band you cut a dipole for. MK |
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