Antenna bandwidth... | Forum for Electronics

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">Antenna bandwidth...</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/externet.13892/" class="username u-concealed" dir="auto" data-user-id="13892" data-xf-init="member-tooltip">Externet</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/antenna-bandwidth.413211/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-30T02:09:10+0000" data-time="1732932550" data-date-string="Nov 30, 2024" data-time-string="2:09 AM" title="Nov 30, 2024 at 2:09 AM">Today at 2:09 AM</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content">  <div id='div-gpt-eda_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eda_wallpaper'); }); </script> </div> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-413211"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="Externet" data-content="post-1784808" id="js-post-1784808" > <span class="u-anchorTarget" id="post-1784808"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/antenna-bandwidth.413211/post-1784808" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-30T02:09:10+0000" data-time="1732932550" data-date-string="Nov 30, 2024" data-time-string="2:09 AM" title="Nov 30, 2024 at 2:09 AM">Today at 2:09 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/antenna-bandwidth.413211/post-1784808" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784808/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/antenna-bandwidth.413211/post-1784808" rel="nofollow"> #1 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/externet.13892/" class="avatar avatar--m" data-user-id="13892" data-xf-init="member-tooltip"> <img src="/data/avatars/m/13/13892.jpg?1591248332" alt="Externet" class="avatar-u13892-m" width="96" height="96" loading="lazy" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/externet.13892/" class="username " dir="auto" data-user-id="13892" data-xf-init="member-tooltip">Externet</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Advanced Member level 2</h5> </div> <img src="/styles/images/ranks/glevel2.gif" alt="Advanced Member level 2"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Jan 29, 2004</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>616</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>28</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/externet.13892" class="fauxBlockLink-linkRow u-concealed">58</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>30</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,308</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Mideast+US" rel="nofollow noreferrer" target="_blank" class="u-concealed">Mideast US</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 6,147 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784808" data-lb-caption-desc="Externet · Nov 30, 2024 at 2:09 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hello. <br /> A television receiving simple antenna receives fine a dozen channels along the spectrum 50 to 700 MHz... The antenna is not tuneable, it has fixed dimensions. A couple of channels get poor-to-no reception. <br /> <br /> There is uncertainty if the <b>not</b> received channel signals are so because :<br /> - their signal strength is weak, or <br /> - the orientation is wrong, or <br /> - temperature affects the propagation, or <br /> - time of the day impairs reception, or <br /> - the dimensions of the receiving elements are not optimal for those channels, or<br /> - the frequency response of the antenna dips at them...<br /> <br /> Are these reasonable guesses ?<br /> The channels received fine are in many very different frequencies. How come the fixed receiving elements of the antenna do receive signals with so varied frequencies ?<br /> OR<br /> Why a television antenna with <b>fixed</b> element dimensions receives well a wide variety of frequencies ?<br /> <br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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color: #e69999"> <span class="avatar-u423852-m" role="img" aria-label="BradtheRad">B</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/bradtherad.423852/" class="username " dir="auto" data-user-id="423852" data-xf-init="member-tooltip"><span class="username--staff username--moderator" itemprop="name">BradtheRad</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Super Moderator</h5> <div class="userBanner userBanner--staff message-userBanner" dir="auto" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Staff member</strong><span class="userBanner-after"></span></div> </div> <img src="/styles/images/ranks/hlevel4.gif" alt="Advanced Member level 7"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Apr 1, 2011</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>15,610</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>2,912</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/bradtherad.423852" class="fauxBlockLink-linkRow u-concealed">5,836</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>3,050</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,393</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Minneapolis%2C+Minnesota%2C+USA" rel="nofollow noreferrer" target="_blank" class="u-concealed">Minneapolis, Minnesota, USA</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 116,899 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784811" data-lb-caption-desc="BradtheRad · Nov 30, 2024 at 4:01 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">All your guesses are correct. And reception can change drastically simply by moving the antenna a few inches. <br /> Years ago when tv broadcasts were analog it was easier to see a difference.<br /> Today a digital channel either shows up fine or intermittently or not at all.<br /> <br /> So when my over-the-air reception of certain channels varies, I have my guesses:<br /> Cloud formations, atmospheric layers of this or that type, multi-path. It's not necessarily weather related. There are times I get good reception even during rain or snow.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/antenna-bandwidth.413211/reply?quote=1784811" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784811/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1784811"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="volker@muehlhaus" data-content="post-1784829" id="js-post-1784829" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784829/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/antenna-bandwidth.413211/" /> <span class="u-anchorTarget" id="post-1784829"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/antenna-bandwidth.413211/post-1784829" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-30T11:25:53+0000" data-time="1732965953" data-date-string="Nov 30, 2024" data-time-string="11:25 AM" title="Nov 30, 2024 at 11:25 AM" itemprop="datePublished">Today at 11:25 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/antenna-bandwidth.413211/post-1784829" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784829/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/antenna-bandwidth.413211/post-1784829" rel="nofollow"> #3 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/volker-muehlhaus.543974/"> <meta itemprop="url" content="https://www.edaboard.com/members/volker-muehlhaus.543974/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/volker-muehlhaus.543974/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="543974" data-xf-init="member-tooltip" style="background-color: #99cc33; 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There might be reflections from incorrectly terminated cable stubs that "notch" some frequency ranges.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/antenna-bandwidth.413211/reply?quote=1784829" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784829/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div 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<div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/antenna-bandwidth.413211/post-1784836" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-30T12:12:53+0000" data-time="1732968773" data-date-string="Nov 30, 2024" data-time-string="12:12 PM" title="Nov 30, 2024 at 12:12 PM" itemprop="datePublished">Today at 12:12 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/antenna-bandwidth.413211/post-1784836" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784836/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/antenna-bandwidth.413211/post-1784836" rel="nofollow"> #4 </a> </li> </ul> </header> </div> <div class="message-inner"> <div 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<dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,393</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Bochum%2C+Germany" rel="nofollow noreferrer" target="_blank" class="u-concealed">Bochum, Germany</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 301,226 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784836" data-lb-caption-desc="FvM · Nov 30, 2024 at 12:12 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">The shown antenna is surely not designed for UHF Band.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/antenna-bandwidth.413211/reply?quote=1784836" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784836/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div 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</div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="Externet" data-content="post-1784842" id="js-post-1784842" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784842/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/antenna-bandwidth.413211/" /> <span class="u-anchorTarget" id="post-1784842"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/antenna-bandwidth.413211/post-1784842" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-30T13:56:29+0000" data-time="1732974989" data-date-string="Nov 30, 2024" data-time-string="1:56 PM" title="Nov 30, 2024 at 1:56 PM" itemprop="datePublished">Today at 1:56 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite 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class="bbWrapper"><blockquote data-attributes="member: 152255" data-quote="FvM" data-source="post: 1784836" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784836" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784836">FvM said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> The shown antenna is surely not designed for UHF Band. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Very correct. It is the obsolete very basic from the sixties, was not easy to find its image on the web to denote its simplicity. And those antennas not designed for UHF, <b>do</b> receive UHF channels within a good range. <u>Why </u>?<br /> <br /> Why a television antenna with <b>fixed</b> element dimensions receives well a wide variety of frequencies ?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/antenna-bandwidth.413211/reply?quote=1784842" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784842/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1784842"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="volker@muehlhaus" data-content="post-1784845" id="js-post-1784845" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784845/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/antenna-bandwidth.413211/" /> <span class="u-anchorTarget" id="post-1784845"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/antenna-bandwidth.413211/post-1784845" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-30T14:06:59+0000" data-time="1732975619" data-date-string="Nov 30, 2024" data-time-string="2:06 PM" title="Nov 30, 2024 at 2:06 PM" itemprop="datePublished">Today at 2:06 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/antenna-bandwidth.413211/post-1784845" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784845/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/antenna-bandwidth.413211/post-1784845" rel="nofollow"> #7 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/volker-muehlhaus.543974/"> <meta itemprop="url" content="https://www.edaboard.com/members/volker-muehlhaus.543974/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/volker-muehlhaus.543974/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="543974" data-xf-init="member-tooltip" style="background-color: #99cc33; color: #2e3d0f"> <span class="avatar-u543974-m" role="img" aria-label="volker@muehlhaus">V</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/volker-muehlhaus.543974/" class="username " dir="auto" data-user-id="543974" data-xf-init="member-tooltip"><span itemprop="name">volker@muehlhaus</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 6</h5> </div> <img src="/styles/images/ranks/hlevel3.gif" alt="Advanced Member level 6"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Apr 11, 2014</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>3,339</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1,086</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/volker-muehlhaus.543974" class="fauxBlockLink-linkRow u-concealed">2,176</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>1,165</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,393</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 21,087 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784845" data-lb-caption-desc="volker@muehlhaus · Nov 30, 2024 at 2:06 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 13892" data-quote="Externet" data-source="post: 1784842" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784842" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784842">Externet said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Why a television antenna with <b>fixed</b> element dimensions receives well a wide variety of frequencies ? </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>If the antenna elements are too long, there are higher order resonances. Example <a href="https://www.researchgate.net/profile/W-Lu-3/publication/332642491/figure/fig1/AS:11431281176055549@1690003336441/The-first-four-resonant-modes-within-a-symmetrical-electric-dipole-antenna.png" target="_blank" class="link link--external" rel="nofollow ugc noopener">here</a>. However, the antenna pattern will become more complex.<br /> <br /> And in between the resonances, the antenna has poor gain, but will still receive <u>something</u> if the field strength is large enough.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/antenna-bandwidth.413211/reply?quote=1784845" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784845/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList is-active"> <ul class="reactionSummary"> 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Forum for Electronics", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.edaboard.com/threads/antenna-bandwidth.413211/", "mainEntity": { "@type": "Question", "@id": "https://www.edaboard.com/threads/antenna-bandwidth.413211/", "name": "Antenna bandwidth...", "datePublished": "2024-11-30T02:09:10+00:00", "url": "https://www.edaboard.com/threads/antenna-bandwidth.413211/", "image": "https://www.edaboard.com/attachments/screenshot-from-2024-11-29-21-00-35-png.195665/", "text": "Hello. \nA television receiving simple antenna receives fine a dozen channels along the spectrum 50 to 700 MHz... The antenna is not tuneable, it has fixed dimensions. A couple of channels get poor-to-no reception. \n\nThere is uncertainty if the not received channel signals are so because :\n- their signal strength is weak, or \n- the orientation is wrong, or \n- temperature affects the propagation, or \n- time of the day impairs reception, or \n- the dimensions of the receiving elements are not optimal for those channels, or\n- the frequency response of the antenna dips at them...\n\nAre these reasonable guesses ?\nThe channels received fine are in many very different frequencies. How come the fixed receiving elements of the antenna do receive signals with so varied frequencies ?\nOR\nWhy a television antenna with fixed element dimensions receives well a wide variety of frequencies ?", "answerCount": 6, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/externet.13892/", "name": "Externet", "url": "https://www.edaboard.com/members/externet.13892/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-11-30T14:06:59+00:00", "url": "https://www.edaboard.com/posts/1784845/", "text": "Why a television antenna with fixed element dimensions receives well a wide variety of frequencies ?\n\nIf the antenna elements are too long, there are higher order resonances. Example here. However, the antenna pattern will become more complex.\n\nAnd in between the resonances, the antenna has poor gain, but will still receive something if the field strength is large enough.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/volker-muehlhaus.543974/", "name": "volker@muehlhaus", "url": "https://www.edaboard.com/members/volker-muehlhaus.543974/" } }, { "@type": "Answer", "datePublished": "2024-11-30T13:56:29+00:00", "url": "https://www.edaboard.com/posts/1784842/", "text": "The shown antenna is surely not designed for UHF Band.\n\nVery correct. It is the obsolete very basic from the sixties, was not easy to find its image on the web to denote its simplicity. And those antennas not designed for UHF, do receive UHF channels within a good range. Why ?\n\nWhy a television antenna with fixed element dimensions receives well a wide variety of frequencies ?", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/externet.13892/", "name": "Externet", "url": "https://www.edaboard.com/members/externet.13892/" } }, { "@type": "Answer", "datePublished": "2024-11-30T13:14:55+00:00", "url": "https://www.edaboard.com/posts/1784841/", "text": "Hi", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/hanif.103753/", "name": "hanif", "url": "https://www.edaboard.com/members/hanif.103753/" } } ] }, "publisher": { "@type": "Organization", "name": "Forum for Electronics", "description": "International Electronics Discussion Forum: EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals", "url": "https://www.edaboard.com" } } </script> <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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