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#1
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Has anyone ever designed a SW transmission system using curtan arrays that has a beamwidth of 2.5 to 5 degrees?
Has anyone ever designed a SW transmission system using curtain arrays that
has a beamwidth of 2.5 to 5 degrees? Most standard curtain arrays [HR 4/4/1 to 12/6/1] have 15 to 30 degrees of beamwidth. |
#2
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I don't know what a curtain array is for SW (Shortwave)
Transmitting.Perhaps someone else has more information. cuhulin |
#3
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Has anyone ever designed a SW transmission system using
curtain arrays that has a beamwidth of 2.5 to 5 degrees? I'd guess that if it were done, it would've been inspired by the cold-war broadcaster vs jammer "contests". If you can find pictures of antenna farms from the 50's/60's/70's (sometimes pictured on QSL cards for example) you might look for patterns indicative of the arrays you're interested in. Tim. |
#4
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Curtain Array - Last picture in the series.. http://www.xs4all.nl/~gouwelee/pj4pa2vst.htm - ALSO.. heard on WBCQ that there is someone in Florida who made their antenna(s) Check around.. |
#6
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Bonaire,looks like a nice place.I didn't know those kinds of antennas
are called curtain antennas,but I have seen them before in movies and books and magazines. cuhulin |
#7
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Max Power wrote in message ... Has anyone ever designed a SW transmission system using curtain arrays that has a beamwidth of 2.5 to 5 degrees? Most standard curtain arrays [HR 4/4/1 to 12/6/1] have 15 to 30 degrees of beamwidth. Talk about the curtain array... that brings to mind a somewhat recent class I took, that of all students attending, there was the daughter of a VOA engineer responsible for rebuilding a number of stations; she was in my study group and what a nitwit! I played dumb and never let on I knew anything about shortwave broadcast stations or the pecuilar circumstances and delicate political situation regarding one of her father's constructions. RG |
#8
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#9
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"Max Power" wrote in message
... Has anyone ever designed a SW transmission system using curtain arrays that has a beamwidth of 2.5 to 5 degrees? Most standard curtain arrays [HR 4/4/1 to 12/6/1] have 15 to 30 degrees of beamwidth. It's gonna be big! A 3 meter diameter dish at 4 GHz has a beanwidth of 1.75 degrees. Scale that to 4 MHz and it will need a diameter of 3 kilometers. For 5 degree beamwidth, probably about 1 kilometer diameter for 4 MHz, and 400 meter diameter at 10 MHz. An array will have similar dimensions for similar results. Tom |
#10
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What the hell! What is in the water over there in Colliersville anyway?
I am going to sic all of them mean old Pitt Bulldogs on you.Hey,I don't know everything about Shortwave Radio and Shortwave Antennas and Shortwave Transmitters.I do know what Curtain Antennas are now though.Sheeesh!,,,y'all Tennesseans sure are dense! Memphians don't like Mississippians either.Those Alabama Dumb Asses are far better than y'all Tennesseans and so are those Louisiana Cajun Coon Asses too.I suppose you have always all your life known what Curtain Antennas/Transmitters are eh? Every since the day you was born! cuhulin |
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