{"id":733,"date":"2014-11-20T16:17:38","date_gmt":"2014-11-21T00:17:38","guid":{"rendered":"http:\/\/www.stevenrhine.com\/?p=733"},"modified":"2025-05-09T22:11:53","modified_gmt":"2025-05-10T05:11:53","slug":"narco-ar-850-teardown","status":"publish","type":"post","link":"https:\/\/www.stevenrhine.com\/?p=733","title":{"rendered":"Narco AR-850 Altitude Encoder \/ Reporter Teardown."},"content":{"rendered":"<p>Found this Narco AR-850 Encoder sitting on the shelf today! A couple years back this Narco AR-850 Altitude Encoder Failed (Stopped reporting Altitude) on My Cessna 150.<\/p>\n<p>If anyone has any info on this unit please post would love to diagnose and repair it! I did find the Narco Patent Info rater limited info.<\/p>\n<p><a href=\"https:\/\/www.google.com\/patents\/US5247465?dq=Narco+Altitude&amp;hl=en&amp;sa=X&amp;ei=FHh1VN7GI6_UiALHpIGQBA&amp;ved=0CB4Q6wEwAA\" target=\"_blank\" rel=\"noopener noreferrer\">Narco AR-850 Patent Info<\/a><\/p>\n<p>My little point and shoot cam sucks! I know but have not seen any info on these on the net so said why not!<\/p>\n<p>Narco AR-850 Altitude Encoder<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/AR850%20Altitude%20Encoder-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/AR850%20Altitude%20Encoder-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 Altitude Encoder Side Profile&#8230;<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/AR850%20Altitude%20Encoder%202-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/AR850%20Altitude%20Encoder%202-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 Guts (Little Plug for Snap-on haha)<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/guts-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/guts-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 PCB Bottom, Lots of flux! (They Need to learn to clean the board!)<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Bottom-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Bottom-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 PCB Front, Lots of flux!<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Front-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Front-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 PCB 1 Caps are RMRM Brand no telling who that is!<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Back-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Back-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 PCB Side Profile<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Side%201-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/PCB%20Side%201-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 Heater or temp sensor is what Usually Fails from what I Here from avionics tech&#8217;s. The ELSEN WA098 POCU97C temp sensor is on the bottom of the pressure sensor there is another part in the pressure sensor housing from the patent it should be a MPX100A will disassemble and see what it really is.<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/Heater%201-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/Heater%201-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Narco AR-850 Chips, As soon as I find the box I have my <a href=\"http:\/\/www.xeltek.com\" target=\"_blank\" rel=\"noopener noreferrer\">Xeltek<\/a> Programmer in I will dump the 2716 eprom.<br \/>\n<a href=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/Chips-s.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/stevenrhine.com\/Avionics\/AR-850%20Altitude%20Encoder\/Chips-s.jpg\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>2025, Sadly I never did remember where I put this encoder lost forever.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Found this Narco AR-850 Encoder sitting on the shelf today! A couple years back this Narco AR-850 Altitude Encoder Failed (Stopped reporting Altitude) on My Cessna 150. If anyone has any info on this unit please post would love to diagnose and repair it! I did find the Narco Patent Info rater limited info. Narco [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"no","footnotes":""},"categories":[1],"tags":[],"class_list":["post-733","post","type-post","status-publish","format-standard","hentry","category-stevens-posts"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Narco AR-850 Altitude Encoder \/ Reporter Teardown. - Steven Rhine - Rhine Labs Blog \/ News<\/title>\n<meta name=\"description\" content=\"Narco AR-850 Altitude Encoder \/ Reporter Teardown\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stevenrhine.com\/?p=733\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Narco AR-850 Altitude Encoder \/ Reporter Teardown.\" \/>\n<meta property=\"og:description\" content=\"Narco AR-850 Altitude Encoder \/ Reporter Teardown\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.stevenrhine.com\/?p=733\" \/>\n<meta property=\"og:site_name\" content=\"Steven Rhine - 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