{"id":745,"date":"2023-03-26T01:04:51","date_gmt":"2023-03-26T01:04:51","guid":{"rendered":"https:\/\/sfbayatsc.koherence.com\/?page_id=745"},"modified":"2023-03-27T20:46:56","modified_gmt":"2023-03-27T20:46:56","slug":"faq","status":"publish","type":"page","link":"https:\/\/sfbayatsc.koherence.com\/index.php\/faq\/","title":{"rendered":"FAQ"},"content":{"rendered":"<div style=\"padding-left: 20px; text-indent: -20px;\"><strong>Q:<\/strong> What kind of antenna(s) are you using?<\/div>\n<div style=\"padding-left: 20px; text-indent: -20px;\">\n<p><strong>A:<\/strong> There are currently three antennas in use:<\/p>\n<ul style=\"text-indent: 0;\">\n<li>A ChannelMaster CM4228HD receives emissions from Sutro Tower and Mount San Bruno.<\/li>\n<li>A ChannelMaster CM4221HD receives emissions from the hills above Fremont. For reasons we have yet to determine this antenna performs best attic-mounted rather than roof\/pole-mounted.<\/li>\n<li>A Winegard HD7000R (with low-vhf extensions installed) receives RF 6 from Mt. Loma Prieta.<\/li>\n<\/ul>\n<\/div>\n<div style=\"padding-left: 20px; text-indent: -20px;\"><strong>Q:<\/strong> What tuner\/demodulator are you using?<\/div>\n<div style=\"padding-left: 20px; text-indent: -20px;\"><strong>A:<\/strong> For ATSC 1.0 we use the fourth-generation HDHomeruns (&#8220;HDHR4&#8221;), also known as the HDHomerun Connect. In our experience these are the most resilient of the HDHomeruns and actually perform better than the 5th-generation HDHomeruns (the ones with the black square enclosure). We haven&#8217;t looked at ATSC 1.0 performance with the latest generation HDFX series.<\/div>\n<div style=\"padding-left: 20px;\">&nbsp;<br \/>\nFor ATSC 3.0 we use a combination of HDHomerun Connect 4Ks (Development Edition), Airwavz RedZone Receiver RZR-1200s, and Airwavz RedZone Receiver RZR-1400s. All have their plusses and minuses. <\/p>\n<p>The Airwavz RZR-1200 exposes many statistics from the tuner\/demodulator and allows capture at the baseband packet level, enabling full analysis of the ATSC 3.0 payload by our stack. However the RZR-1200 is an early ATSC 3.0 device with a demodulator that struggles with dynamic multipath and weaker signals. Both the HDHomerun Connect 4K and Airwavz RZR-1400 sport the newer Sony ATSC 3.0 tuner\/demodulator with rather good sensitivity and dynamic multipath performance. However the Sony tuner\/demodulator processes the baseband packets internally and outputs ALP packets. As a result we don&#8217;t get a good idea of channel utilization (i.e. the actual PLP bitrate, as stuffing occurs at the baseband packet level.) The HDHomeruns also do not expose the level of tuner\/demodulator information that the RZRs do. Lastly, while the HDHomeruns are more affordable than the RZRs and have two ATSC 3.0-capable tuners, we are currently experiencing stability issues where the Connect 4k will spontaneously unlock from 3.0 signal and fail to relock.<\/p><\/div>\n<p><\/p>\n<div style=\"padding-left: 20px; text-indent: -20px;\"><strong>Q:<\/strong> Are you affiliated with any of the Bay Area broadcasters?<\/div>\n<div style=\"padding-left: 20px; text-indent: -20px;\"><strong>A:<\/strong> No. Koherence, LLC has a long history in working with consumer electronics companies, including in their development of DVRs and related devices. The OTA broadcast monitor is an outgrowth of Koherence&#8217;s internal tools used in the development and testing of these products. It&#8217;s been made publicly available in the hope that it is useful to the local broadcast engineering and enthusiast community.\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Q: What kind of antenna(s) are you using? A: There are currently three antennas in use: A ChannelMaster CM4228HD receives emissions from Sutro Tower and Mount San Bruno. A ChannelMaster CM4221HD receives emissions from the hills above Fremont. For reasons we have yet to determine this antenna performs best attic-mounted rather than roof\/pole-mounted. A Winegard &hellip; <a href=\"https:\/\/sfbayatsc.koherence.com\/index.php\/faq\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">FAQ<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-745","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/pages\/745","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/comments?post=745"}],"version-history":[{"count":53,"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/pages\/745\/revisions"}],"predecessor-version":[{"id":821,"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/pages\/745\/revisions\/821"}],"wp:attachment":[{"href":"https:\/\/sfbayatsc.koherence.com\/index.php\/wp-json\/wp\/v2\/media?parent=745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}