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#1
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All Band Coax-fed Dipole ??????????
Owen Duffy wrote:
Search for 8010ABD100 on their home page. It says "ready to connect to *your* coax", "RG8X not included)" It's not their fault if *your* coax is lossy. :-) Wonder what kind of balun that is? -- 73, Cecil http://www.qsl.net/w5dxp |
#2
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All Band Coax-fed Dipole ??????????
the loss is unacceptable in my opinion. the lobes off the antenna are
unpredictable. an all band antenna like that is just to get on the air. i have met Mr. Rogers several times. Gravity |
#3
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All Band Coax-fed Dipole ??????????
"gravity" wrote in message
reenews.net... the loss is unacceptable in my opinion. the lobes off the antenna are unpredictable. an all band antenna like that is just to get on the air. i have met Mr. Rogers several times. Gravity The antenna pattern is highly predictable using modeling software. The transmission line losses are probably not as high as Owen predicts since we do not know the value of the attenuator inside the balun. I have seen at least three antennas that had attenuators in antenna matching networks in order to meet wideband VISOR requirements. These included a 25 ft marine whip, and a military vehicular antenna. All you need is a 3 dB pad for 3:1 VISOR. Giving a power rating to a dipole is suspicious also; although voltage breakdown may be a factor. Note that it is rated at 400 WE "ROMS" -- whatever the heck that is supposed to mean. Regards, Frank |
#4
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All Band Coax-fed Dipole ??????????
Sorry I must have clicked spell check for VSWR not "VISOR"! Also
"W" for "WE" and "RMS" for "ROMS". Frank "Frank" wrote in message newsWxng.91970$S61.1023@edtnps90... "gravity" wrote in message reenews.net... the loss is unacceptable in my opinion. the lobes off the antenna are unpredictable. an all band antenna like that is just to get on the air. i have met Mr. Rogers several times. Gravity The antenna pattern is highly predictable using modeling software. The transmission line losses are probably not as high as Owen predicts since we do not know the value of the attenuator inside the balun. I have seen at least three antennas that had attenuators in antenna matching networks in order to meet wideband VISOR requirements. These included a 25 ft marine whip, and a military vehicular antenna. All you need is a 3 dB pad for 3:1 VISOR. Giving a power rating to a dipole is suspicious also; although voltage breakdown may be a factor. Note that it is rated at 400 WE "ROMS" -- whatever the heck that is supposed to mean. Regards, Frank |
#5
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All Band Coax-fed Dipole ??????????
"Frank" wrote in message news:uZxng.91997$S61.76029@edtnps90... Sorry I must have clicked spell check for VSWR not "VISOR"! Also "W" for "WE" and "RMS" for "ROMS". i googled VISOR thinking it was some cool military antenna. Gravity |
#6
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All Band Coax-fed Dipole ??????????
The antenna pattern is highly predictable using modeling software.
he would have to model the antenna, then figure out what beam headings he desires, then find supports for the antenna. this is IMPOSSIBLE on most sububan lots. The transmission line losses are probably not as high as Owen predicts since we do not know the value of the attenuator inside the balun. he might as well use a dummy load. Gravity |
#7
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All Band Coax-fed Dipole ??????????
The antenna pattern is highly predictable using modeling software.
oh it's predictable all right, however it's often USELESS. it's a compromise antenna relative to decent dipoles. Gravity |
#8
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All Band Coax-fed Dipole ??????????
These included
a 25 ft marine whip, and a military vehicular antenna. All you need is a 3 dB pad for 3:1 VISOR. you can burn up 6 dB in an antenuator and RG 58. and that's if the SWR is 1 to 1. if someone has interest in 28 mhz, just put up a rotatable dipole too. Gravity |
#9
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All Band Coax-fed Dipole ??????????
Giving a power rating to a dipole is suspicious also; although voltage
breakdown may be a factor. Note that it is rated at 400 WE "ROMS" -- whatever the heck that is supposed to mean. 400 w RMS. 750 w peak. Gravity |
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