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Author Topic: Johnson Cap DUH??  (Read 4150 times)
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KB2WIG
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« on: January 15, 2007, 11:24:08 AM »
As seen on EPAY

Johnson VariCap....  I've never seen one like this. Is this 'normal' or home brew??



   the listing number         300069741875

* 01d8_1_b.jpg (18.66 KB, 400x300 - viewed 481 times.)
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n3lrx
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« Reply #1 on: January 15, 2007, 12:32:19 PM »
I've seen them before. It's actually 3 section cap..
The bottom is one cap, the top 2 are seperated. It's also a differential I think that's what they call it.
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WA1GFZ
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« Reply #2 on: January 16, 2007, 11:01:36 AM »
Looks like the loading cap from a Johnson KV match box. Dual differential.
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Ralph W3GL
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« Reply #3 on: January 16, 2007, 08:06:54 PM »
No, it is not a "loading" cap...  It's the MATCHING cap from the little 275 watt scratch box   Dual differential thingy with that fiber coupling on the rotor shaft that is prone to develop a carbon track if you don't use the box correctly...  If you get one flashover there, your done till you replace that coupling...Of yeah, the controls on the match box are "Tuning" & "Matching"...
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73,  Ralph  W3GL 

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WA1GFZ
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« Reply #4 on: January 16, 2007, 08:46:09 PM »
I think Ralph is correct my KW flash box has a ceramic coupler
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KB2WIG
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« Reply #5 on: January 16, 2007, 09:00:15 PM »
Thanks all....   it just lookss so JS'ed that I had to ask.  The fiber coupling - just wierd in respect to isolation of the shafts. How to insure the shafts are seperated from each other?  Looks like a setup for  'spark gap' inside the coupling.  klc
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