Advanced(Beverage(Antenna Designs - W4HODw4hod.org/K4IQJ Beverage Talk.pdf ·...
Transcript of Advanced(Beverage(Antenna Designs - W4HODw4hod.org/K4IQJ Beverage Talk.pdf ·...
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Advanced Beverage Antenna Designs
Compiled & Annotated by
Richard C. Jaeger, K4IQJ July 9, 2013
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TransacHons of the AIEE, pp. 215-‐265, February 1923.
50 pages!
Actually a BOG!
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Single Wire Beverage
Two Wire Beverage
TransacHons of the AIEE, pp. 215-‐265, February 1923.
Note!
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Borrowed from Wikipedia “Beverage Antenna”
• The Beverage antenna is a long wire receiving antenna mainly used in the high frequency (shortwave) and medium frequency radio bands. It is used by amateur radio, shortwave listening, longwave radio DXers and in military applicaHons.
• The antenna was patented in 1921 and named for its inventor Harold H. Beverage.
• Beverage experimented with receiving antennas similar to the Beverage antenna in 1919 at the O_er Cliffs Radio StaHon.
• By 1921, Beverage long wave receiving antennas up to nine miles (14 km) long had been installed at RCA's Riverhead, New York, Belfast, Maine, Belmar, New Jersey, and Chatham, Massachuse_s, receiver staHons.
• Perhaps the largest Beverage antenna—an array of four phased Beverages three miles (5 km) long and two miles (3 km) wide—was built by AT&T in Houlton, Maine, for the first transatlanHc telephone system opened in 1927.
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h_p://www.navycthistory.com/o_ercliffs01.html
Radio NBD, O,er Cliffs, Maine (circa 1917-‐1919)
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Radio NBD, O,er Cliffs, Maine (circa 1917-‐1919)
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• Lossy Ground Electric Field Tilts • No Tilt = No Output (E . dL) • Doesn’t work well over high conducHvity ground
(as discovered by many DXpediHons to remote islands)
Figures borrowed from: ON4UN’s Low-‐Band DXing Book
VerHcally Polarized Signals With Wave Fronts Tilted
• Desired Signal Appears at Antenna Feed Point • Unwanted Signal Dumped into TerminaHng Resistor
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Pa_ern vs Length
Similar to a single loop
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Pa_ern vs Length (cont.)
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Beverage TerminaHon Techniques
• Basic TerminaHon (≅ 470 Ω)
• (B-‐C) Good for poor ground and for simulaHon (EZNEC) – terminated by λ/4 lines
• (D) Preferred to reduce verHcal pickup from verHcal end
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h_p://kw2p.blogspot.com Wednesday, August 18, 2010 KW2P Beverage Antenna Designs
Desired Signal
3’ to 6’ High
TerminaHon Feed Point
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Two-‐Wire Beverage Using “ReflecHon Transformer”
Remember Beverage’s Paper! & ReflecHon transformer
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• Received signals SR and SL are common to both closely spaced wires (common-‐mode signals)
• SL is picked off by at center-‐tap of T2 by transformer T1 and fed to J1
• SR is picked off from center-‐tap of transformer T3 and sent back down the two-‐wire transmission line as a differenHal-‐mode signal and into coax connected to T2 and J2
Two-‐Wire Bi-‐direcHonal Beverage Clever Use of Transformers!
SL
SR
ReflecHon Transformer! (only a 90 year old concept)
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KW2P Beverage Antenna Designs
End Fed Coax Beverage
ReflecHon transformer
Feed Point & TerminaHon
Desired Signal (On Outside of Coax)
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Coaxial Bi-‐DirecHonal Beverage More Clever Use of Transformers!
• Received signals SR and SL are both on the outside of the coax
• SL is picked off by transformer T1 and fed to J1
• SR is picked off by transformer T3 and sent back down the inside of the coax transmission line and into the coax connected to T2 and J2
SL
SR
ReflecHon Transformer
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Coax + Wire Beverage – Middle Fed
ReflecHon Transformer
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Coax Beverage with Reversible Feed
Switch Coax and TerminaHon ZT to Reverse DirecHons
ReflecHon Transformer
ReflecHon Transformer
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Beverage on Ground (BOG or Snake Antenna)
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BevPro-‐1
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$300
$ 299.95