{"id":2345,"date":"2026-11-10T15:35:22","date_gmt":"2026-11-10T15:35:22","guid":{"rendered":"https:\/\/mm0zif.radio\/current\/?p=2345"},"modified":"2026-11-10T15:35:23","modified_gmt":"2026-11-10T15:35:23","slug":"why-feeder-matters","status":"publish","type":"post","link":"https:\/\/mm0zif.radio\/current\/2026\/11\/why-feeder-matters\/","title":{"rendered":"Why Feeder Matters!"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>The right amateur radio feeder is not optional. It directly determines how much of your transmitter\u2019s power actually reaches the antenna, how cleanly the system behaves, and how reliably the station performs.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In amateur radio, the feeder (also called the feed line or transmission line) is the critical link between the radio and the antenna. Choose poorly and you can lose a large fraction of your power as heat, create unwanted radiation or common-mode currents, degrade SWR, or even risk equipment stress. Choose correctly and you maximise efficiency, keep the system quiet and stable, and make matching and tuning far easier.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What a Feeder Actually Does<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A feeder carries RF energy between the transceiver (or amplifier) and the antenna while ideally keeping that energy confined and delivering it with minimal loss and at the correct impedance. Real-world feeders are imperfect. Every type has characteristic impedance, attenuation that rises with frequency and length, power-handling limits, velocity factor, and susceptibility to environmental effects. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The \u201cright\u201d feeder is the one whose properties best match the frequency range, power level, run length, antenna impedance, and installation constraints of the station.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Main Types and Their Trade-offs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coaxial cable<\/strong> is the most common choice. It is shielded, relatively easy to route, weather-resistant when properly jacketed, and works well with modern solid-state radios that expect 50 \u03a9. Quality varies widely:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low-loss hardline or LMR-series cables keep attenuation acceptable on VHF\/UHF and longer HF runs.<\/li>\n\n\n\n<li>Cheap RG-58 or thin RG-8X becomes lossy quickly as frequency or length increases; what looks like a modest SWR at the radio can mask heavy power loss in the cable itself.<\/li>\n\n\n\n<li>Coax is unbalanced, so it can encourage common-mode current on the shield if the antenna is not well balanced or if a proper choke\/<a href=\"https:\/\/mm0zif.radio\/current\/2024\/11\/baluns-and-ununs-transforming-signals-in-the-radio-world\/\">balun<\/a> is omitted.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Open-wire line (ladder line, window line, twin-lead)<\/strong> is balanced and can exhibit very low loss even when the SWR is high. It is excellent for multi-band antennas fed with a wide-range tuner because the line itself does not dissipate much power. Drawbacks include the need for careful spacing from metal objects, greater susceptibility to weather* and nearby conductors, and the requirement for a balanced tuner or good balun. It is often the superior technical choice for HF wire antennas where low loss and multi-band operation matter more than convenience.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">* Here in the Hebrides open wire is not really an option as it will literally be destroyed by the salt air.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Other options (hardline, heliax, specialty foam-dielectric cables, etc.) occupy niches where extremely low loss or high power is required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why the Choice Matters in Practice<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Loss and efficiency.<\/strong> Feeder attenuation is frequency and length dependent. On 10 meters or VHF\/UHF, even a few dozen meters of ordinary coax can turn a significant percentage of your power into heat before it ever reaches the antenna. High SWR multiplies the effective loss because energy makes multiple trips up and down the line. Low-loss line (or open-wire) keeps more power available for radiation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Impedance and matching.<\/strong> Modern radios are designed around 50 \u03a9. A feeder whose characteristic impedance and the antenna\u2019s feed-point impedance produce a high SWR forces the radio\u2019s protection circuits or an external tuner to work harder. Excessive reflected power can reduce output, generate heat in the final amplifier, or trigger fold-back. A well-chosen feeder plus appropriate <a href=\"https:\/\/mm0zif.radio\/current\/2024\/11\/making-a-11-balun-for-amateur-radio\/\">balun<\/a> or matching network keeps the load the radio \u201csees\u201d reasonable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common-mode current and radiation.<\/strong> An unbalanced feeder or missing choke allows RF to flow on the outside of the coax shield. This can cause the feed line itself to radiate, distort the antenna pattern, create RFI in the shack, and make the system sensitive to the presence of the operator or nearby objects. Balanced line or a properly placed common-mode choke mitigates this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Power handling and reliability.<\/strong> High power, high SWR, or thin dielectric can lead to voltage breakdown or excessive heating. Outdoor installations demand UV-resistant jackets, proper grounding, and weatherproofing; indoor or temporary runs have different constraints. The wrong cable can fail prematurely or create a safety issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Operational flexibility.<\/strong> Multi-band HF antennas often present widely varying impedance&#8217;s. Low-loss open-wire line plus a good tuner handles this gracefully. Fixed-frequency or VHF\/UHF work usually favours low-loss 50 \u03a9 coax for simplicity and predictability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Selection Guidelines<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measure or calculate the expected loss for the length and frequency; treat published attenuation figures as best-case and allow margin for connectors, aging, and moisture. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Match the feeder type to the antenna: balanced antennas often benefit from balanced line or a good balun; unbalanced antennas (verticals, many beams) work naturally with coax plus appropriate choking. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep runs as short as practical, but never at the expense of proper antenna placement. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use quality connectors, proper weatherproofing, and adequate strain relief. A high-quality feeder with poor terminations is still a weak link. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider the entire system: radio \u2192 feeder \u2192 balun\/choke \u2192 antenna. Optimising only one piece while neglecting the others yields disappointing results.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">To Conclude.<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The feeder is not merely a piece of wire that happens to connect the radio to the antenna. It is an active part of the RF system whose loss, impedance behavior, balance, and environmental performance directly affect radiated power, pattern integrity, equipment stress, and interference. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selecting the right type and installing it correctly turns a mediocre station into an efficient one and prevents many of the mysterious performance problems that frustrate operators. In amateur radio, the antenna gets most of the attention, but the feeder is what determines how much of your hard-won RF actually gets the chance to leave the station.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The right amateur radio feeder is not optional. It directly determines how much of your transmitter\u2019s power actually reaches the antenna, how cleanly the system behaves, and how reliably the station performs.<\/p>\n","protected":false},"author":1,"featured_media":2346,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"give_campaign_id":0,"om_disable_all_campaigns":false,"footnotes":""},"categories":[40,98],"tags":[208,209],"class_list":["post-2345","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio","category-antennas","tag-coax","tag-feeder"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"The right amateur radio feeder is not optional. 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