long wire antenna
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From: klem kedidelhopper on 6 Mar 2010 09:17 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
From: William Sommerwerck on 6 Mar 2010 09:25 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.
From: hr(bob) hofmann on 6 Mar 2010 17:23 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.
From: Fred McKenzie on 6 Mar 2010 18:16 In article <b95b2e30-d784-4658-ad49-af533ad62b50(a)g7g2000yqe.googlegroups.com>, klem kedidelhopper <captainvideo462009(a)gmail.com> wrote: > 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. Lenny- This is a case of "try it and it will probably work". I once lived in an apartment with a balcony that had a railing. Someone before me had bolted a CB 3/8-24 mirror antenna mount to the rail. I attached a 40 Meter mobile whip and used it as a transmit antenna. The Kenwood TS-690SAT had no trouble matching it. It didn't get out very well but reception was good. For a general purpose shortwave antenna, a 102 inch CB Whip mounted this way on the railing, might work quite well. It could stick out away from the building. He could feed it with Co-Ax cable, or just another long wire between the whip and the radio's antenna terminal. Fred
From: Phil Allison on 6 Mar 2010 21:11
"klem kedidelhopper" > > A customer lives in an apartment house on the 17th floor. He wants > to use an old Hallicrafters AM and SW radio. ** For AM broadcast, by far the best is to use a frame aerial. Heaps of stuff on the net about making them. > He cannot put up a long wire antenna in the conventional way, ** Chances are any SW reception will be very badly affected by RFI from the thousands of nearby TVs, PCs and other assorted electronic devices using SMPSs that all radiate interference in the SW band. Only the strongest signals will be heard OK and them he can pick up on a whip antenna mounted on a balcony railing. ..... Phil |