{"id":120,"date":"2023-07-11T17:49:44","date_gmt":"2023-07-11T09:49:44","guid":{"rendered":"https:\/\/ra0sms.shop\/?page_id=120"},"modified":"2025-07-07T11:55:55","modified_gmt":"2025-07-07T03:55:55","slug":"dummy-load-rf-50-ohm-so-239","status":"publish","type":"page","link":"https:\/\/shop.ra0sms.com\/index.php\/catalog\/other-devices\/dummy-load-rf-50-ohm-so-239\/","title":{"rendered":"Dummy Load RF 50 Ohm (SO-239)"},"content":{"rendered":"<p><a href=\"https:\/\/shop.ra0sms.com\/wp-content\/uploads\/2023\/07\/2-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-122\" src=\"https:\/\/shop.ra0sms.com\/wp-content\/uploads\/2023\/07\/2-1.jpg\" alt=\"\" width=\"374\" height=\"249\" \/><\/a> <a href=\"https:\/\/shop.ra0sms.com\/wp-content\/uploads\/2023\/07\/1-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-121\" src=\"https:\/\/shop.ra0sms.com\/wp-content\/uploads\/2023\/07\/1-2.jpg\" alt=\"\" width=\"378\" height=\"252\" \/><\/a><\/p>\n<p>This dry dummy load has been designed to provide constant 50 \u03a9 impedance to a radio transmitter to allow off-air tests and experiments.<br \/>\nThe coaxial construction creates a load that presents a more stable resistance to the transmitter output over a wider range of frequencies, testing has shown the following SWR measurements using a nanoVNA, +\/-:<br \/>\n3.8 MHz &#8211; 1.01:1<br \/>\n7 MHz &#8211; 1.02:1<br \/>\n30 MHz &#8211; 1.05:1<br \/>\n50 MHz &#8211; 1.12:1<br \/>\n70 MHz &#8211; 1.22:1<br \/>\n145 MHz &#8211; 1.50:1<br \/>\n433 MHz &#8211; 1.70:1<br \/>\nConstructed from high quality PCB material and using 20 x 1 K\u03a9 2 Watt Metal Film or Carbon Film resistors (see photos) the dummy load while air cooled is capable of absorbing RF energy of 40-50 Watts continuously for 1 minute, and up to 100 Watts for several seconds. The load can also be mounted in a can with oil for longer use at 100 watts.<br \/>\nConnection to the dummy load is via a high quality SO-239 UHF Connector mounted on the PCB.<\/p>\n<p>Overall dimension is: 50 mm diameter.<br \/>\n<strong>Weight: 100g<\/strong><br \/>\n<strong>Cost: 15USD<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This dry dummy load has been designed to provide constant 50 \u03a9 impedance to a radio transmitter to allow off-air tests and experiments. The coaxial construction creates a load that presents a more stable resistance to the transmitter output over &hellip; <a href=\"https:\/\/shop.ra0sms.com\/index.php\/catalog\/other-devices\/dummy-load-rf-50-ohm-so-239\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":36,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-120","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/pages\/120","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/comments?post=120"}],"version-history":[{"count":2,"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/pages\/120\/revisions"}],"predecessor-version":[{"id":580,"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/pages\/120\/revisions\/580"}],"up":[{"embeddable":true,"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/pages\/36"}],"wp:attachment":[{"href":"https:\/\/shop.ra0sms.com\/index.php\/wp-json\/wp\/v2\/media?parent=120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}