It was cold this morning — 47F outside and 64F inside.\u00a0 Today was the first time that have worn my jacket since we have been here.\u00a0 The Swazis were all bundled up and thought they were ‘freezing’!<\/p>\n
I wrote up an initial report about attempts to tune up TX3 on higher frequencies.\u00a0 After the morning broadcasts ended, this tuning was continued.\u00a0 At some point while tuning on 15475 kHz, it was discovered that the auto tuning was not tuning the PA plate current into the dip, but off to one side.\u00a0 This caused a decrease in PA plate efficiency of about 10%, which is enough to cause the cooling water to boil excessively when operating at 100kw.<\/p>\n
When we set this transmitter up in Elkhart, we adjusted the lengths of coax cables that provide signals to the phase error detector so that tuning into the dip takes place automatically.\u00a0 I am puzzled as to what has changed to cause these different results.\u00a0 There had been a 4″ length of coax added to the PA plate signal, so I removed this and saw a slight improvement in tuning.\u00a0 It appears the PA plate signal coax needs to be shorter, but it looks like it will not reach, if it is shortened any more.\u00a0 Alternatively, it should be possible to lengthen the other two signal inputs instead, but we need to find a method of doing this without trial-and-error use of expensive connectors and cutting up expensive cable.\u00a0 Also, there may be something else in this circuit that may have changed, which we should be looking at first.<\/p>\n
We added two 18″ cables to the other two inputs, since this is all we had on hand, but the transmitter decided it would not come up at all.\u00a0\u00a0 High voltage did not even come on!\u00a0 We were within minutes of needing this transmitter on the air, so aborted the test, took out the two 18″ cables, and retuned to the needed evening frequency.\u00a0 Thankfully the transmitter came up on this lower frequency, leaving us to sort out the other problem on another day.<\/p>\n
Virginia has been asked to help tutor Graham’s daughter Berniece to get her make an easier transition from the Swaziland to British school system.\u00a0 This afternoon was her first session.<\/p>\n
Was it ever cold getting into bed this evening!\u00a0 An electric blanket would sure come in handy.<\/p>\n","protected":false},"excerpt":{"rendered":"
It was cold this morning — 47F outside and 64F inside.\u00a0 Today was the first time that have worn my jacket since we have been here.\u00a0 The Swazis were all bundled up and thought they were ‘freezing’! I wrote up an initial report about attempts to tune up TX3 on higher frequencies.\u00a0 After the morning […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_s2mail":"yes","footnotes":""},"categories":[5],"tags":[11,12],"class_list":["post-276","post","type-post","status-publish","format-standard","hentry","category-swaziland-2013","tag-11","tag-swaziland"],"_links":{"self":[{"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/posts\/276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=276"}],"version-history":[{"count":1,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/posts\/276\/revisions"}],"predecessor-version":[{"id":684,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=\/wp\/v2\/posts\/276\/revisions\/684"}],"wp:attachment":[{"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcguirereport.mcguireclan.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}