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title = 'Homebrew common mode choke'
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summary = '''A simple and quite tiny common mode choke that I built for my
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portable operations.'''
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date = '2023-10-26T13:36:26+02:00'
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#lastmod = ''
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#categories = [ 'amateur-radio', 'computerstuff' ]
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#tags = []
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showBreadcrumbs = true
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# showDate = false
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showReadingTime = false
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showWordCount = false
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# showPagination = false
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# feed_exclude = true
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# site_exclude = true
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draft = true
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I've built myself a common mode choke last winter (2022) but haven't created
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this page yet. Also I haven't used it much because I haven't been very active
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this year.
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So this is basically a 140-43 toroid with 9 turns of RG174 connected to
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BNC connectors.
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@ -20,4 +20,18 @@ draft = true
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Beside some other little tryouts this is probably the first
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antenna that I built myself. It works without a tuner (depending
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on the actual position of the antenna).
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My first contact with this antenna was into Israel (~2629 km) with my
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older FT-891. It was contest time and I actually replied to a contest
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station because I thought nobody would hear me because of my crappy
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antenna but I found myself picked up by that contest station from Israel.
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The resulting report of _59_ would not mean anything but at least I knew
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the antenna was working just fine.
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I got a SWR of about 1:1 (1.02) when I measured the antenna in an L
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configuration -- approx. 1-1.5m above the ground.
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