[Today’s run: 3 miles]<\/p>\n
We had a nice Thanksgiving meal today, had relatives over.\u00a0 It was a very nice day.<\/p>\n
On the radio front, I worked some more on the old National NCX-5.\u00a0 Everything was running ok but it was giving me a zoop zoop chirp on CW.\u00a0 I spent some time looking at the VFO.\u00a0 There was about a 2 hertz change in the VFO when I keyed up.<\/p>\n
Long ago, when I first got this thing, one of the big problems was that it changed frequency from transmit to receive.\u00a0 At that time it was changing something like 2 kHz.\u00a0 I finally narrowed it down to a capacitor in the VFO buffer circuit.\u00a0 The schematic says ’10’.\u00a0 Today I was looking at that and I noticed that the one I had put in there (probably in 2002) was really a\u00a0 1oo pf, not a 10 pf. (!)<\/p>\n
I replaced that one with a real 10 pf capacitor.\u00a0 No more T\/R frequency shift!\u00a0 I was elated.<\/p>\n
But another problem now.\u00a0 Some time after that was working I now have no receive noise on SSB or CW, only on AM.\u00a0 And, I am no longer getting any output on transmit.\u00a0 I know that was working just a few minutes ago.\u00a0 I have either burned something up or messed it up somehow.<\/p>\n
After some more playing around I had nothing coming out of the VFO.\u00a0 That was the little zener that I had put in as a voltage stabilizer (in trying to fix the T\/R problem).\u00a0 It shorted out.\u00a0 Take that out, now I have VFO and I have receive on AM again.\u00a0 Still no receive on SSB\/CW and no transmit.<\/p>\n
I need to check some of the fundamental voltages, make sure I have the basics covered.\u00a0 I hope I haven’t broken something important!<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
[Today’s run: 3 miles] We had a nice Thanksgiving meal today, had relatives over.\u00a0 It was a very nice day. On the radio front, I worked some more on the old National NCX-5.\u00a0 Everything was running ok but it was giving me a zoop zoop chirp on CW.\u00a0 I spent some time looking at the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3151","post","type-post","status-publish","format-standard","hentry","category-ham-radio"],"_links":{"self":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/3151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3151"}],"version-history":[{"count":3,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/3151\/revisions"}],"predecessor-version":[{"id":3153,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/3151\/revisions\/3153"}],"wp:attachment":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3151"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}