{"id":13502,"date":"2024-08-24T15:03:19","date_gmt":"2024-08-24T13:03:19","guid":{"rendered":"https:\/\/nolle.engineering\/?post_type=product&#038;p=13502"},"modified":"2026-05-12T07:53:20","modified_gmt":"2026-05-12T05:53:20","slug":"l-band-antenna-h1","status":"publish","type":"product","link":"http:\/\/nolle.engineering\/en\/product\/l-band-antenna-h1\/","title":{"rendered":"L-Band H1 1420 MHz"},"content":{"rendered":"<h2>What it does<\/h2>\r\n<p>A 10-turn RHCP helix tuned to 1420 MHz, the rest frequency of the 21 cm neutral-hydrogen line. Used for amateur radio-astronomy work \u2014 observing galactic hydrogen distribution, tracking spiral-arm rotation curves, and building a personal H1 radio telescope without a parabolic dish.<\/p>\r\n<h2>Specifications<\/h2>\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Parameter<\/th>\r\n<th>Value<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Center frequency<\/td>\r\n<td>1420 MHz<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Polarization<\/td>\r\n<td>RHCP<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Helix turns<\/td>\r\n<td>10<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Wire diameter<\/td>\r\n<td>3.5 mm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Connector<\/td>\r\n<td>N-type<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Length \u00d7 \u00d8<\/td>\r\n<td>521 \u00d7 180 mm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Weight<\/td>\r\n<td>650 g<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Mount<\/td>\r\n<td>6 \u00d7 M4 bolts (universal) for el\/az tracking<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Material<\/td>\r\n<td>PETG, UV-resistant<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Color<\/td>\r\n<td>Orange\/White (default), Custom on request<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>Typical use cases<\/h2>\r\n<ul>\r\n<li>Detection of the galactic 21 cm hydrogen line from the Milky Way disc<\/li>\r\n<li>Doppler-shift mapping of galactic-arm rotation<\/li>\r\n<li>Single-dish radio-astronomy education projects<\/li>\r\n<\/ul>\r\n<h2>Compatible chain<\/h2>\r\n<ul>\r\n<li>Hydrogen-line LNA (e.g. SAWbird+ H1, ~25 dB gain, integrated bandpass) \u2014 required, since the antenna is passive<\/li>\r\n<li>SDR with at least 2 MHz bandwidth (RTL-SDR v3 \/ Airspy Mini \/ HackRF)<\/li>\r\n<li>Outdoor \/ dark-sky site away from cellular and WiFi RFI<\/li>\r\n<li>SDR# \/ Gqrx \/ GNU Radio for capture; H-line specific software for averaging<\/li>\r\n<\/ul>\r\n\r\n<h2 class=\"wp-block-heading\">Color options<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The <strong>Color<\/strong> option applies to the 3D-printed parts only \u2014 the <strong>baseplate<\/strong> and <strong>rim<\/strong>. The <strong>radome pipe is always white<\/strong>, regardless of the Color choice.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Orange\/White<\/strong> \u2014 orange baseplate and rim with the standard white radome pipe.<\/li>\r\n<li><strong>Custom<\/strong> \u2014 custom color for the baseplate and rim. White is a valid choice; pick Custom if you want a uniform white antenna.<\/li>\r\n<\/ul>\r\n\r\n<h2>Documented in the Lab<\/h2>\r\n<ul>\r\n<li><a href=\"\/en\/2024\/08\/23\/l-band-helix-antenna-for-radio-astronomy\/\">L-Band Helix Antenna for Radio Astronomy \u2014 A Practical Guide<\/a> \u2014 full setup, results, RFI mitigation<\/li>\r\n<\/ul>\r\n<p><em>Custom polarization or color combinations available on request \u2014 please use the contact form for a quote.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>10-turn RHCP helix tuned to 1420 MHz, the neutral-hydrogen 21 cm radio-astronomy line. Direct reception, no dish needed. Suitable for amateur radio astronomy, mapping the galactic hydrogen distribution.<\/p>","protected":false},"featured_media":12834,"template":"","meta":[],"product_brand":[],"product_cat":[52],"product_tag":[],"class_list":["post-13502","product","type-product","status-publish","has-post-thumbnail","product_cat-lband","first","instock","taxable","shipping-taxable","purchasable","product-type-variable","has-default-attributes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L-Band H1 1420 MHz \u2014 hydrogen-line helix antenna - nolle.engineering<\/title>\n<meta name=\"description\" content=\"10-turn RHCP helix tuned to 1420 MHz hydrogen line. Direct reception, no dish. For amateur radio astronomy and 21 cm hydrogen-line mapping. 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