{"id":46,"date":"2026-08-18T22:44:06","date_gmt":"2026-08-19T03:44:06","guid":{"rendered":"https:\/\/kg5a.us\/?page_id=46"},"modified":"2026-09-23T20:51:10","modified_gmt":"2026-09-24T01:51:10","slug":"dmr-vocabulary","status":"publish","type":"page","link":"https:\/\/kg5a.us\/index.php\/dmr-vocabulary\/","title":{"rendered":"DMR Vocabulary"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Here is the expanded list of vocabulary needed to understand dual-time slot TDMA under the ETSI DMR standard.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ETSI (European Telecommunications Standards Institute):<\/strong> An independent, non-profit organization that specifies and standardizes digital telecommunications technologies globally. The open technical standard is here:<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.dmrassociation.org\/dmr-standards.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.dmrassociation.org\/dmr-standards.html<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TDMA (Time Division Multiple Access):<\/strong> Technology dividing a single 12.5 kHz radio channel into discrete, repeating time segments to allow multiple simultaneous transmissions on one frequency.<\/li>\n\n\n\n<li><strong>Time Slot (TS 1 \/ TS 2):<\/strong> The individual, alternating communication paths within a TDMA channel where <strong>Timeslot 1<\/strong> and <strong>Timeslot 2<\/strong> carry completely independent audio streams on the SAME repeater. It&#8217;s like 2 repeaters in one box.<\/li>\n\n\n\n<li><strong>Frame:<\/strong> The foundational 30 millisecond repetitive timing unit in DMR, which is structurally divided into two 15 millisecond time slots.<\/li>\n\n\n\n<li><strong>Burst:<\/strong> The actual data or voice packet transmitted in rapid succession during a specific time slot while the radio rapidly switches between transmitting and listening.<\/li>\n\n\n\n<li><strong>Color Code:<\/strong> The digital equivalent of an analog PL tone (0\u201315) used to separate local repeaters and ensure proper slot timing synchronization.<\/li>\n\n\n\n<li><strong>Talk Group (TG):<\/strong> A logical channel or digital chat room assigned to a specific time slot, organizing traffic so only radios tuned to that group hear the audio.<\/li>\n\n\n\n<li><strong>Group Call:<\/strong> A one-to-many transmission where a single radio transmits to an entire Talk Group, allowing all operators monitoring that specific group and time slot to listen.<\/li>\n\n\n\n<li><strong>Private Call:<\/strong> A direct, one-to-one transmission targeted to a single radio&#8217;s unique ID, occupying the assigned time slot so other users cannot join the conversation.<\/li>\n\n\n\n<li><strong>Promiscuous Mode (Digital Monitor):<\/strong> A radio receiver setting that bypasses Talk Group and Color Code filters, letting a ham hear all traffic occurring on a specific time slot.<\/li>\n\n\n\n<li><strong>Synchronization (SYNC):<\/strong> The critical alignment of internal clocks between radios and repeaters to prevent slot-timing errors and overlapping transmissions.<\/li>\n\n\n\n<li><strong>DMR Tier II:<\/strong> The official ETSI standard for conventional, licensed digital radio systems that mandates the use of two-slot TDMA operation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here is the expanded list of vocabulary needed to understand dual-time slot TDMA under the ETSI DMR standard. https:\/\/www.dmrassociation.org\/dmr-standards.html<\/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-46","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/pages\/46","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/comments?post=46"}],"version-history":[{"count":3,"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/pages\/46\/revisions"}],"predecessor-version":[{"id":64,"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/pages\/46\/revisions\/64"}],"wp:attachment":[{"href":"https:\/\/kg5a.us\/index.php\/wp-json\/wp\/v2\/media?parent=46"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}