.net barcode reader component download 9-9B Gain versus length of vee beam and rhombic beam antennas in Software

Generation Data Matrix in Software 9-9B Gain versus length of vee beam and rhombic beam antennas

9-9B Gain versus length of vee beam and rhombic beam antennas
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224 Longwire directional antennas
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Beverage or wave antennas
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9-10 Nonresonant vee beam antenna
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The termination resistance for the nonresonant rhombic is 600 to 800 , and must be noninductive For transmitting rhombics, the resistor should be capable of dissipating at least one-third of the average power of the transmitter For receiveonly rhombics, the termination resistor can be a 2-W carbon composition or metalfilm type Such an antenna works nicely over an octave (2:1) frequency range
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The Beverage or wave antenna is considered by many people to be the best receive antenna available for very low frequency (VLF), AM broadcast band (BCB), medium
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Nonresonant single-wire longwire antennas 225
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wave (MW), or tropical band (low HF region) DXing The Beverage was used by RCA at its Riverhead, Long Island (NY) station in 1922, and a technical description by Dr H H Beverage (for whom it is named) appeared in QST magazine for November 1922, in an article titled The Wave Antenna for 200-Meter Reception In 1984, an edited and updated version of the 1922 article appeared in the same magazine In 1921, Paul Godley, under sponsorship of the American Radio Relay League, journeyed to Scotland to erect a receiving station at Androssan His mission was to listen for amateur radio signals from North America As a result of politicking in the post World War I era, hams were consigned to the supposedly useless shortwave ( < 200 m), and it was not clear that reliable international communications were possible Godley went to Scotland to see if that could happen; he reportedly used a wave antenna for the task (today, called the Beverage) The Beverage antenna is a longwire of special design, more than one wavelength (1 ) long (Fig 9-12), although some authorities maintain that >05 is minimally sufficient The Beverage provides good directivity and good gain, but is not very efficient
226 Longwire directional antennas As a result, it is preferred for receiving, and is less useful for transmitting This is an example of how different attributes of various antennas make the Law of Reciprocity an unreliable sole guide to antenna selection Unlike the regular longwire, which is of a different design, the Beverage is intended to be mounted close to the earth s surface (typically < 01 ); heights of 8 to 10 feet is the usual prescription Figure 9-12 shows the basic single-wire Beverage antenna It consists of a single conductor (no16 to no8 wire, with no14 being most common) erected about 8 to 10 ft above ground Some Beverages are unterminated (and bidirectional), but most of them are terminated at the far end in a resistance R equal to the antenna s characteristic impedance Zo The receiver end is also terminated in its characteristic impedance, but generally requires an impedance matching transformer to reduce the antenna impedance to the 50- standard impedance used by most modern transmitters The Beverage works best in the low-frequency bands (VLF through MW), although at least some results are reportedly relatively easy to obtain up to 25 m (115 MHz) Some questionably successful attempts have been made at making Beverage antennas work as high as the 11-m Citizens Band or the 10-m ham band (297 MHz) The Beverage antenna works on vertically polarized waves arriving at low angles of incidence These conditions are normal in the AM BCB, where nearly all transmitting antennas are vertically polarized In addition, the ground- and sky-wave propagations found in these bands (VLF, BCB, and low HF) are relatively consistent As the frequency increases, however, two factors become increasingly dominant First, the likelihood of horizontal polarization increases because of the size of a wavelength at those frequencies The polarization of the received signal not only changes in those bands, but does so constantly when conditions are unsettled It is the strong dependence of the
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