long wire antenna
in [Repair]
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From: Sjouke Burry on 6 Mar 2010 21:38 hr(bob) hofmann(a)att.net wrote: > On Mar 6, 8:17 am, klem kedidelhopper <captainvideo462...(a)gmail.com> > wrote: >> A customer lives in an apartment house on the 17th floor. He wants to >> use an old Hallicrafters AM and SW radio. He cannot put up a long wire >> antenna in the conventional way, however he wants to "weave" a sort of >> antenna outside on his terrace, sort of like a web, with insulators to >> hold the wire in every bend off ground. In this way he hopes to >> achieve the length of a long wire antenna in a confined space. Will >> this scheme work? The other option would be to hang a 2 X 4 off the >> edge of the terrace and drop a wire down with an insulator on it and >> hope that he can secure it to a neighbors terrace several floors >> below. Anyone have any thought on this problem. Thanks, Lenny > > What is the railing on the deck, wood or metal? He needs to keep the > wire aeay from any metal. Or use the railing as antenna. Also, when sort on space, a loop antenna might be usefull.
From: Arfa Daily on 7 Mar 2010 20:45 "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote in message news:hmtoke$5hi$1(a)news.eternal-september.org... > In a very broad sense, the customer is correct. A 10m wire forms a 20m > half-wave antenna, pretty much regardless of how it's oriented or it > snakes > around. > > There are books on compact and hidden antennas you might want to look at. > > It's not unlike a wing. Almost any surface flat on the bottom and curved > on > the top can produce lift. > > So how come a symmetrical wing, such as might be found on a stunt plane, still flies, and most asymmetric wings fly quite happily upside down ? :-) Arfa
From: Phil Allison on 7 Mar 2010 20:51 "Arfa Daily" >> It's not unlike a wing. Almost any surface flat on the bottom and curved >> on the top can produce lift. >> > > So how come a symmetrical wing, such as might be found on a stunt plane, > still flies, and most asymmetric wings fly quite happily upside down ? > :-) > ** I ask people who *think* they know how a plane flys that same Q. Stumps them all the time. Goes to show how simple explanations are often highly flawed. ...... Phil
From: William Sommerwerck on 7 Mar 2010 23:43 >> It's not unlike a wing. Almost any surface flat on the >> bottom and curved on the top can produce lift. > So how come a symmetrical wing, such as might be found > on a stunt plane, still flies, and most asymmetric wings fly > quite happily upside down ? :-) I don't know. But that wasn't the point I was making.
From: tnom on 8 Mar 2010 04:35
On Sat, 6 Mar 2010 06:17:39 -0800 (PST), klem kedidelhopper <captainvideo462009(a)gmail.com> wrote: >A customer lives in an apartment house on the 17th floor. He wants to >use an old Hallicrafters AM and SW radio. He cannot put up a long wire >antenna in the conventional way, however he wants to "weave" a sort of >antenna outside on his terrace, sort of like a web, with insulators to >hold the wire in every bend off ground. In this way he hopes to >achieve the length of a long wire antenna in a confined space. Will >this scheme work? The other option would be to hang a 2 X 4 off the >edge of the terrace and drop a wire down with an insulator on it and >hope that he can secure it to a neighbors terrace several floors >below. Anyone have any thought on this problem. Thanks, Lenny With just a randomly oriented long wire you will get unpredictable results. A better idea would be to get a PVC form of three to six inches and helically wind the wire. The exact length won't matter because you do not have a specific frequency in mind. Generally the more wire the better. Mount it vertically or if you like move it around for the best reception. |