{"id":8343,"date":"2018-09-11T10:10:39","date_gmt":"2018-09-11T14:10:39","guid":{"rendered":"http:\/\/starlightcascade.ca\/blog\/?p=8343"},"modified":"2018-09-11T10:10:39","modified_gmt":"2018-09-11T14:10:39","slug":"dew-heaters","status":"publish","type":"post","link":"https:\/\/starlightcascade.ca\/blog\/2018\/09\/dew-heaters\/","title":{"rendered":"Dew Heaters"},"content":{"rendered":"<p><a href=\"http:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551-299x210.jpg\" alt=\"\" width=\"299\" height=\"210\" class=\"aligncenter size-medium wp-image-2859\" srcset=\"https:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551-299x210.jpg 299w, https:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551-150x105.jpg 150w, https:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551-1023x721.jpg 1023w, https:\/\/starlightcascade.ca\/blog\/wp-content\/uploads\/2012\/04\/cute_mouse-8551.jpg 1080w\" sizes=\"auto, (max-width: 299px) 100vw, 299px\" \/><\/a>After a dewy FallNStars star party weekend it was time to go back and start working  on making work all of the various dew heating bits and pieces we have laying around.<\/p>\n<p>I found a bag of heaters, and a mouse nest.  Got rid of the mouse nest  and discovered a hole in the middle of the 40&#8243; heater, mainly the felt<br \/>\ncover with a few nibbles on the heater as well.  And on another 6&#8243;  heater, the end velcro strap was totally gone.<\/p>\n<p>So.. All of these items are now stored inside a plastic bin. Yes, I know  this will not stop the mouse built it will slow him down.. and I will be<br \/>\nable to see inside and if I see him, wave a goodbye!   Will repair  these two in the next few days.<\/p>\n<p>So, a kendrick 40&#8243; strap will work on a 12&#8243; diameter telescope (C=D*Pi)  D=C\/Pi=40\/3.14 = 12.7&#8243;<\/p>\n<p>The 19&#8243; strap (19\/3.14=6) is good for a 6&#8243; diameter telescope and the 6&#8243;  is good (6\/3.14=1.9) for a 1.25&#8243; eyepiece.<\/p>\n<p>Resistance wise, the 6&#8243;=52 ohms, the 19&#8243; is 9.4 ohms and the 40&#8243; is 5.2 ohms<\/p>\n<p>V=IR, Power=IV= V^2\/R so<\/p>\n<p>the 6&#8243; strap at 52 ohms at 12 vdc gives 12^2\/52=144\/52= 2.77 watts<\/p>\n<p>the 19&#8243; strap at 9.4 ohms at 12vdc gives 12^2\/9.4=144\/9.4= 15.3 watts<\/p>\n<p>the 40&#8243; strap at 5.2 ohms at 12vdc gives 12^2\/5.2=144\/5.2 = 27.7 watts<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After a dewy FallNStars star party weekend it was time to go back and start working on making work all of the various dew heating bits and pieces we have laying around. I found a bag of heaters, and a mouse nest. Got rid of the mouse nest and discovered a hole in the middle [&hellip;]<\/p>\n","protected":false},"author":494,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-8343","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"_links":{"self":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/8343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/users\/494"}],"replies":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/comments?post=8343"}],"version-history":[{"count":1,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/8343\/revisions"}],"predecessor-version":[{"id":8344,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/8343\/revisions\/8344"}],"wp:attachment":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/media?parent=8343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/categories?post=8343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/tags?post=8343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}