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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: Re: fm sleuth ???? posted by bartc on November 21, 2005 at 06:06:21:
during WWII in the UK 40-42 when the firts AA gunnery Radar sets came into use, rotating phased arrays of H antennas, one for azimuth / one for elevation, they found it benefitted from an artificial ground plane / E plane, laid on the ground and tyed down.The cheapest material was chicken wire, ie ~> one inch sq. holes. But, resourceful poms who were going all 'dig for Britain' who wanted a chook-run as well, suddenly found that all stock was now strategic, the problem was only brief.
What you would need is a flat 'panel' behind the antenna, it would need to be 6 feet square minimum by 6 feet or so, minimum. You could even have a U-shaped screen but with sides angled out wards this would cut pick up from the side and rear, If say you had a mountain beside/behind you, or a block of flats. I have one on either side, but only the near one. Mt Taylor is close enough and high enough, and it DOES cause a tiny almost parallel ghost on VHF and UHF TV via the external mast and antennas.
One other advantage of loft antennas, assuming one direction is enough, is that wind load is no longer a factor- so strength is less important, and > ing the surface area of elements is now possible. You can build a 3 element quad of say 3 inch wide aluminium foil on cardboard even, or 3mm MDF. One director, one active pick-up element, and one reflector, add a shield. ||| > ing in size to the back like a Yagi but 4 sides.
another option is two matching Yagis crossed, + coaxially, if you have multipath probs and plenty of signal strength.
PIN your meters to max!!!!
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
http://www.theanalogdept.com/tim_bailey.htm
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Follow Ups
- Chicken wire. - Timbo in Oz 11/22/0518:23:39 11/22/05 (0)
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