[Boatanchors] Johnson KW Matchbox - Problem with the "matching capacitor

[Brad Councilman]

Hi Dave,

I'm currently in the process of going through a KW matchbox (for the first time). 

Sorry I can't help you with the capacitor rotor problem.  As for the missing terminals, what appears to be an exact match for mine:

https://www.ebay.com/itm/Vintage-EF-Johnson-Ceramic-Feed-Thru-Insulator-Lot-of-3/184504976954?hash=item2af55a863a:g:VgUAAOSwNxdfliT5

I can email a picture of the rear panel if that would help.

BTW, I've tested with 125' inverted V doublet via 600 ohm ladder line.  Also with long wire (against a good earth ground).  Works surprisingly well.  Those old timers knew what they were doing.

Currently have the directional coupler awaiting exploratory surgery.  Works, but does not scale the the meter properly.  Hoping it's something simple and obvious.

--Brad  W1BCC


 



On Thu, 29 Oct 2020 15:10:50 -0500, David Propper <k2dp at charter.net> wrote:

>> Hi all,
>>
>> I am refurbishing a KW Matchbox that someone had previously converted to a “coax “ only (ie: unbalanced” tuner). The “Matching” variable capacitor will not stay in a “set” position once adjusted and the “rotors” constantly want to hang down at the bottom of the variable capacitor. I don’t see a spring to use to adjust the tension on the shaft so that it stays in place once adjusted for proper tuning. Can someone explain to me how to tighten the tension on the capacitor shaft ?
>>
>> I am also looking for a pair of the ceramic standoff insulators mounted on the rear of the KW Matchbox for the “balanced feedline” to attach to. Does anyone have a spare set available ? If so, please advise.
>>
>> You can reach me at k2dp at charter.net
>>
>> Thanks and 73,
>> Dave, K2DP
>> St. Louis, MO
>>
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