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#12
March 1st 11, 11:38 PM
posted to rec.radio.shortwave
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2 kinds of loops
On Mar 1, 5:58*am, dave wrote:
On 03/01/2011 12:35 AM, wrote: On Feb 28, 9:12 am, *wrote: My large horizontal loop requires no aiming nor tuning. It is for SWL and amateur receiving only. Set it and forget it. QRM was the main problem. It is 95% solved. I never (never) hear light switches (which cause huge explosions on my ham radio) or the oscillators in my analog TV; and like that there.- Hide quoted text - - Show quoted text - Horiz. sweep circuits in the CRT based units are extremely rich in harmonics . You must have built an extremely successful product . Any details/schematic available ? Length feet = 1005/frequency of interest Make area inside the loop as large as possible. Get it up in the air (although under the eaves will work if you don't have a lot of metal flashing.) It seems to be deaf to most QRM generated in the "near field", so I have it 3' above my roof, generally in the same shape as the house, parallel to the ground. I cut the loop and put an MFJ-913 4:1 current BalUn, 'cause that's what I had lying around. For receive you can get away with a reversed CATV BalUn. It wants to be balanced. Use ladder line, twinlead, or a BalUn with coax. This article is only about half bull****: http://n1su.com/loop.html SkyWires · SkyWire Loop Antennas http://groups.yahoo.com/group/SkyWires/ |
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