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Skew (antenna) - Wikipedia

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searchaux" style="display:none">Method of placing the antennas in a transmitter station</div> <p><b>Skew</b> is a term used in <a href="/wiki/Antenna_(radio)" title="Antenna (radio)">antenna engineering</a>. It is a technique to improve the horizontal <a href="/wiki/Radiation_pattern" title="Radiation pattern">radiation pattern</a> of a high power <a href="/wiki/Transmitter_station" title="Transmitter station">transmitter station</a>. </p><p>In a high power <a href="/wiki/VHF" class="mw-redirect" title="VHF">VHF</a> or <a href="/wiki/UHF" class="mw-redirect" title="UHF">UHF</a> station, usually the antenna system is constructed to broadcast to four directions each separated <b>90°</b> from each other. So the directivity of the antenna system resembles a <a href="/wiki/Four_leaf_clover" class="mw-redirect" title="Four leaf clover">four leaf clover</a>. While settlements within the <a href="/wiki/Main_lobe" title="Main lobe">main lobe</a> receive enough energy, the energy received by the settlements between the main lobes may be <b>6 dB</b> less. </p><p>One popular method to solve the problem is to skew the antenna panels symmetrically around the central axis of the mast.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> Usually a skew of <b>λ/4</b> gives the desired almost-uniform horizontal radiation pattern. But in cases where more than one <a href="/wiki/Radio_frequency" title="Radio frequency">RF</a> signal is applied to antenna system (via <a href="/wiki/Combiner" class="mw-redirect" title="Combiner">combiner</a>), the improvement in the horizontal radiation pattern may be inadequate for some signals. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skew_(antenna)&amp;action=edit&amp;section=1" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">R.Busi: <i>High altitude VHF and UHF Broadcasting stations</i>, EBU technical center, Brussels, 1967 p 25</span> </li> </ol></div> <div class="navbox-styles"><style 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title="CCIR System N">System N</a>)</li> <li><a href="/wiki/819_line" title="819 line">819-line</a> (<a href="/wiki/CCIR_System_E" title="CCIR System E">System E</a>, <a href="/wiki/CCIR_System_E#System_F" title="CCIR System E">System F</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Color systems</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NTSC" title="NTSC">NTSC</a></li> <li><a href="/wiki/NTSC-J" title="NTSC-J">NTSC-J</a></li> <li><a href="/wiki/Clear-Vision" title="Clear-Vision">Clear-Vision</a></li> <li><a href="/wiki/PAL" title="PAL">PAL</a></li> <li><a href="/wiki/PAL-M" title="PAL-M">PAL-M</a></li> <li><a href="/wiki/PAL-S" title="PAL-S">PAL-S</a></li> <li><a href="/wiki/PALplus" title="PALplus">PALplus</a></li> <li><a href="/wiki/SECAM" title="SECAM">SECAM</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Video</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Analog_television#Structure_of_a_video_signal" title="Analog television">Back porch</a> and <a href="/wiki/Analog_television#Structure_of_a_video_signal" title="Analog television">front porch</a></li> <li><a href="/wiki/Black_level" title="Black level">Black level</a></li> <li><a href="/wiki/Blanking_level" title="Blanking level">Blanking level</a></li> <li><a href="/wiki/Chrominance" title="Chrominance">Chrominance</a></li> <li><a href="/wiki/Chrominance_subcarrier" title="Chrominance subcarrier">Chrominance subcarrier</a></li> <li><a href="/wiki/Colorburst" title="Colorburst">Colorburst</a></li> <li><a href="/wiki/Color_killer" title="Color killer">Color killer</a></li> <li><a href="/wiki/Color_television" title="Color television">Color TV</a></li> <li><a href="/wiki/Composite_video" title="Composite video">Composite video</a></li> <li><a href="/wiki/Frame_(video)" class="mw-redirect" title="Frame (video)">Frame (video)</a></li> <li><a href="/wiki/Horizontal_scan_rate" title="Horizontal scan rate">Horizontal scan rate</a></li> <li><a href="/wiki/Horizontal_blanking_interval" title="Horizontal blanking interval">Horizontal blanking interval</a></li> <li><a href="/wiki/Luma_(video)" title="Luma (video)">Luma</a></li> <li><a href="/wiki/Nominal_analogue_blanking" title="Nominal analogue blanking">Nominal analogue blanking</a></li> <li><a href="/wiki/Overscan" title="Overscan">Overscan</a></li> <li><a href="/wiki/Raster_scan" title="Raster scan">Raster scan</a></li> <li><a href="/wiki/Safe_area_(television)" title="Safe area (television)">Safe area</a></li> <li><a href="/wiki/Television_lines" title="Television lines">Television lines</a></li> <li><a href="/wiki/Vertical_blanking_interval" title="Vertical blanking interval">Vertical blanking interval</a></li> <li><a href="/wiki/White_clipper" title="White clipper">White clipper</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Sound</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Multichannel_television_sound" class="mw-redirect" title="Multichannel television sound">Multichannel television sound</a></li> <li><a href="/wiki/NICAM" title="NICAM">NICAM</a></li> <li><a href="/wiki/Sound-in-Syncs" title="Sound-in-Syncs">Sound-in-Syncs</a></li> <li><a href="/wiki/Zweikanalton" title="Zweikanalton">Zweikanalton</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Modulation</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Frequency_modulation" title="Frequency modulation">Frequency modulation</a></li> <li><a href="/wiki/Quadrature_amplitude_modulation" title="Quadrature amplitude modulation">Quadrature amplitude modulation</a></li> <li><a href="/wiki/Single-sideband_modulation#Vestigial_sideband_(VSB)" title="Single-sideband modulation">Vestigial sideband modulation (VSB)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Transmission</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Amplifier#Electronic_amplifiers" title="Amplifier">Amplifiers</a></li> <li><a href="/wiki/Antenna_(radio)" title="Antenna (radio)">Antenna (radio)</a></li> <li><a href="/wiki/Broadcast_transmitter" title="Broadcast transmitter">Broadcast transmitter</a>/<a href="/wiki/Transmitter_station" title="Transmitter station">Transmitter station</a></li> <li><a href="/wiki/Resonator#Electromagnetic" title="Resonator">Cavity amplifier</a></li> <li><a href="/wiki/Differential_gain" title="Differential gain">Differential gain</a></li> <li><a href="/wiki/Differential_phase" title="Differential phase">Differential phase</a></li> <li><a href="/wiki/Diplexer" title="Diplexer">Diplexer</a></li> <li><a href="/wiki/Dipole_antenna" title="Dipole antenna">Dipole antenna</a></li> <li><a href="/wiki/Dummy_load" title="Dummy load">Dummy load</a></li> <li><a href="/wiki/Frequency_mixer" title="Frequency mixer">Frequency mixer</a></li> <li><a href="/wiki/Intercarrier_method" title="Intercarrier method">Intercarrier method</a></li> <li><a href="/wiki/Intermediate_frequency" title="Intermediate frequency">Intermediate frequency</a></li> <li><a href="/wiki/Output_power_of_an_analog_TV_transmitter" title="Output power of an analog TV transmitter">Output power of an analog TV transmitter</a></li> <li><a href="/wiki/Pre-emphasis" class="mw-redirect" title="Pre-emphasis">Pre-emphasis</a></li> <li><a href="/wiki/Residual_carrier" title="Residual carrier">Residual carrier</a></li> <li><a href="/wiki/Split_sound_system" title="Split sound system">Split sound system</a></li> <li><a href="/wiki/Superheterodyne_transmitter" title="Superheterodyne transmitter">Superheterodyne transmitter</a></li> <li><a href="/wiki/Television_receive-only" title="Television receive-only">Television receive-only</a></li> <li><a href="/wiki/Direct-broadcast_satellite_television" class="mw-redirect" title="Direct-broadcast satellite television">Direct-broadcast satellite television</a></li> <li><a href="/wiki/Television_transmitter" title="Television transmitter">Television transmitter</a></li> <li><a href="/wiki/Terrestrial_television" title="Terrestrial television">Terrestrial television</a></li> <li><a href="/wiki/Transposer" title="Transposer">Transposer</a></li> <li><a href="/wiki/Digital_television_transition" title="Digital television transition">Digital television transition</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Radio_frequency" title="Radio frequency">Frequencies</a> &amp; bands</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Frequency_offset" title="Frequency offset">Frequency offset</a></li> <li><a href="/wiki/Microwave_transmission" title="Microwave transmission">Microwave transmission</a></li> <li><a href="/wiki/Television_channel_frequencies" title="Television channel frequencies">Television channel frequencies</a></li> <li><a href="/wiki/Ultra_high_frequency" title="Ultra high frequency">UHF</a></li> <li><a href="/wiki/Very_high_frequency" title="Very high frequency">VHF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Radio_propagation" title="Radio propagation">Propagation</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Beam_tilt" title="Beam tilt">Beam tilt</a></li> <li><a href="/wiki/Distortion" title="Distortion">Distortion</a></li> <li><a href="/wiki/Earth_bulge" class="mw-redirect" title="Earth bulge">Earth bulge</a></li> <li><a href="/wiki/Field_strength_in_free_space" class="mw-redirect" title="Field strength in free space">Field strength in free space</a></li> <li><a href="/wiki/Noise_(electronics)" title="Noise (electronics)">Noise (electronics)</a></li> <li><a href="/wiki/Null_fill" title="Null fill">Null fill</a></li> <li><a href="/wiki/Path_loss" title="Path loss">Path loss</a></li> <li><a href="/wiki/Radiation_pattern" title="Radiation pattern">Radiation pattern</a></li> <li><a class="mw-selflink selflink">Skew</a></li> <li><a href="/wiki/Television_interference" title="Television interference">Television interference</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Testing</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Distortionmeter" title="Distortionmeter">Distortionmeter</a></li> <li><a href="/wiki/Field_strength_meter" title="Field strength meter">Field strength meter</a></li> <li><a href="/wiki/Vectorscope" title="Vectorscope">Vectorscope</a></li> <li><a href="/wiki/VIT_signals" title="VIT signals">VIT signals</a></li> <li><a href="/wiki/Zero_reference_pulse" title="Zero reference pulse">Zero reference pulse</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Artifacts</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dot_crawl" title="Dot crawl">Dot crawl</a></li> <li><a href="/wiki/Ghosting_(television)" title="Ghosting (television)">Ghosting</a></li> <li><a href="/wiki/Hanover_bars" title="Hanover bars">Hanover bars</a></li> <li><a href="/wiki/Sparklies" title="Sparklies">Sparklies</a></li></ul> </div></td></tr></tbody></table></div> <!-- NewPP limit report Parsed by mw‐api‐ext.eqiad.main‐6696b4cc84‐lqh45 Cached time: 20241122144516 Cache expiry: 2592000 Reduced expiry: false Complications: [vary‐revision‐sha1] CPU time usage: 0.152 seconds Real time usage: 0.292 seconds Preprocessor visited node count: 275/1000000 Post‐expand include size: 19769/2097152 bytes Template argument size: 576/2097152 bytes Highest expansion depth: 8/100 Expensive parser function count: 0/500 Unstrip recursion depth: 0/20 Unstrip post‐expand size: 8710/5000000 bytes Lua time usage: 0.099/10.000 seconds Lua memory usage: 1598885/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 250.515 1 -total 55.07% 137.957 1 Template:Short_description 43.58% 109.180 1 Template:Analogue_TV_transmitter_topics 42.50% 106.461 1 Template:Navbox 32.20% 80.678 2 Template:Main_other 31.32% 78.453 1 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