{"id":2948,"date":"2022-03-27T15:38:46","date_gmt":"2022-03-27T18:38:46","guid":{"rendered":"http:\/\/www.summersidearc.com\/?p=2948"},"modified":"2022-03-27T15:42:53","modified_gmt":"2022-03-27T18:42:53","slug":"coax-and-ladder-line-info","status":"publish","type":"post","link":"http:\/\/www.summersidearc.com\/index.php\/2022\/03\/27\/coax-and-ladder-line-info\/","title":{"rendered":"Coax and Ladder-Line Info&#8230;"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Coax and Ladder-Line Info<\/h3>\n\n\n\n<p>Basic Feedline Facts for Hams<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>RG-174 (50 ohms) is very small (~0.11&#8243;) and lossy. Suitable only for short pigtails and jumpers at very low power, as in receivers, scanners, etc.<\/li><li>RG-58 (50 ohm) is about 0.195&#8243;, quite lossy, suitable only for mobile installations (typically &lt; 20 feet, &lt; 150 watts).<\/li><li>RG-6 (75 ohms) is about 0.332&#8243;, typically used for cable\/satellite TV.<\/li><li>RG-8X (50 ohm); and and RG-59 (75 ohm) are about 0.24 inch. Suitable for medium power (~350 watts), HF and Lo-VHF.<\/li><li>RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0.405 inch. Suitable for higher power (~1800 watts) at HF.<\/li><li>9913 and LMR-400 are popular \u201clow-loss\u201d RG-8 types. Suitable for VHF (~1.5dB loss per 100 feet at 146 MHz). The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. However, stranded center conductors have a little higher loss than solid ones.<\/li><li>There are at least four commonly-used types of coax dielectric: (1) semi-solid polyethylene (PE) for temps up to 80\u00b0C (V<sub>p<\/sub>&nbsp;66%); (2) gas-injected PE (foam PE) for temps up to 100\u00b0C (V<sub>p<\/sub>&nbsp;~85%); (3) air-core: a thinner PE with a PE strand spiraled around the inner conductor (V<sub>p<\/sub>&nbsp;~85%); and (4) PTFE (Teflon) for temps up to 250\u00b0C.<\/li><li>All foam-type coax cables should be taped\u2014<strong>not<\/strong>&nbsp;attached with plastic cable ties or wire\u2014to tower legs, etc., to prevent deforming of the foam dielectric.<\/li><li>Windowed ladder-line (WLL) should be (1) kept at least a few inches from metal (to prevent magnetic induction losses); (2) twisted 1\/2 turn per foot (to prevent wind flap); and (3) turned at a large radius (12 inches or more). It has a VF of 91-95%. See also KV5R\u2019s&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/kv5r.com\/ham-radio\/ladder-line\/\" target=\"_blank\">Ladder-Line<\/a>&nbsp;pages.<\/li><li>Though frequently ignored, all RF transmission lines have maximum RMS voltage, and maximum power (wattage), which varies with type, brand, and frequency.<\/li><li>How much attenuation is acceptable? Well, a mere 3dB will waste 50% of your wattage!<\/li><\/ul>\n\n\n\n<p>More Info at:  https:\/\/kv5r.com\/ham-radio\/coax-loss-calculator\/<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coax and Ladder-Line Info Basic Feedline Facts for Hams RG-174 (50 ohms) is very small (~0.11&#8243;) and lossy. Suitable only for short pigtails and jumpers at very low power, as in receivers, scanners, etc. RG-58 (50 ohm) is about 0.195&#8243;, <a href=\"http:\/\/www.summersidearc.com\/index.php\/2022\/03\/27\/coax-and-ladder-line-info\/\" class=\"read-more\">Read more\u2026 <\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2948","post","type-post","status-publish","format-standard","hentry","category-archive"],"_links":{"self":[{"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/posts\/2948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/comments?post=2948"}],"version-history":[{"count":3,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/posts\/2948\/revisions"}],"predecessor-version":[{"id":2951,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/posts\/2948\/revisions\/2951"}],"wp:attachment":[{"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/media?parent=2948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/categories?post=2948"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.summersidearc.com\/index.php\/wp-json\/wp\/v2\/tags?post=2948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}