{"id":367,"date":"2019-05-05T18:29:26","date_gmt":"2019-05-06T00:29:26","guid":{"rendered":"http:\/\/w9cva.org\/?p=367"},"modified":"2019-05-05T18:30:22","modified_gmt":"2019-05-06T00:30:22","slug":"spring-time-is-repeater-repair-time","status":"publish","type":"post","link":"https:\/\/w9cva.org\/index.php\/2019\/05\/05\/spring-time-is-repeater-repair-time\/","title":{"rendered":"spring time is repeater repair time or “Poly is dead”"},"content":{"rendered":"

we have a had some comments on one our local VHF machines about it being weak and noisy<\/p>\n

this is a shared antenna and feed line with our clubs UHF machine which has had similar issues for a couple months
\nthe site isnt really to easy to get into during the UNBELIEVABLE SNOW we had this winter
\nbut today we ventured forth and ran the service monitor across the equipment
\nfirst we put a analyzer on\u00a0 the line coming off the diplexer it rang in at 4.9:1 SWR on 2M ,\u00a0hummmm we said
\nthen we put the analyzer right on the 7\/8″ line coming into the building DING ! 1.5:1
\nso we took the PolyPhaser off the wall (this was a old cable headend building so the wall is a ground plate)<\/p>\n

and saw
\nwell that explained quite a bit of trouble
\nso we bypassed the dead poly
\nand checked the PO and receive on both machines
\nthe UHF showed a issue it gave 20 watts out of the cans which is fine but the squelch didnt start to open till we got to -80db or so. a bit of prodding showed a loose connector on the duplexer tee (gotta love a MASTR II running for months into a pooched poly and a loose fitting)
\nbut the VHF was a different thing
\nit was putting out just 1.1 watts after the cans (the PA is set for 80 watts)
\nso we have been using this thing all winter at that power level, it was weak but it still got the job done!
\nif the circulator saved the PA until the trace failure or the other way around we wont know
\nmost of you that know MASTR II VHF PAs have seen the trace failure near the finals
\nwell it had that, so we soldered that up and poof off it went
\nand of course we had to make a quick trip back to base camp to grab a new poly (it is lightning season after all)
\nbolted the new poly onto the ground plane and Miller time!
\nso the PolyPhaser did its job and gave its life to protect the rest of the equipment
\nand this is proof again that the MASTR II can hang with the tough dogs<\/p>\n","protected":false},"excerpt":{"rendered":"

we have a had some comments on one our local VHF machines about it being weak and noisy<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[7,11],"tags":[],"class_list":["post-367","post","type-post","status-publish","format-image","hentry","category-news-information","category-tools","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/posts\/367","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/comments?post=367"}],"version-history":[{"count":2,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/posts\/367\/revisions"}],"predecessor-version":[{"id":369,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/posts\/367\/revisions\/369"}],"wp:attachment":[{"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/media?parent=367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/categories?post=367"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/w9cva.org\/index.php\/wp-json\/wp\/v2\/tags?post=367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}