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Article #9258Re: TV Antennas, the knob
From: Tad Cook
Date: Wed, 02 Jan 1991 23:17
Date: Wed, 02 Jan 1991 23:17
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In article <6690003@hpcvaac.cv.hp.com>, billn@hpcvaac.cv.hp.com (bill nelson) writes: > > Absolutely correct - I believe the primary cause of the impedence variation > is due to mounting height variation. I know the effect decreases as the > height (in wavelengths) increases. I don't think the 25-40 ft above ground > level is enough to minimize this factor. Maybe at HF, but at VHF 25-40 feet above ground without nearby obstructions should be just fine for minimizing impedance variations. I have seen charts in the ARRL Antenna Book which shows impedance variation based upon height above ideal ground, and they are talking about at a wavelength or less. One wavelength at lowest frequency (TV ch2) is something around 17 feet. Tad Cook Seattle, WA Packet: KT7H @ N7HFZ.WA.USA.NA Phone: 206/527-4089 MCI Mail: 3288544 Telex: 6503288544 MCI UW USENET:...uw-beaver!sumax!amc-gw!ssc!tad or, tad@ssc.UUCP
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!uunet!pilchuck!ssc!tad From: tad@ssc.UUCP (Tad Cook) Newsgroups: sci.electronics Subject: Re: TV Antennas, the knob Summary: impedance Message-ID: <725@ssc.UUCP> Date: 2 Jan 91 23:17:21 GMT References: <14239@mcdphx.phx.mcd.mot.com> <6690003@hpcvaac.cv.hp.com> Organization: very little Lines: 24