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Thread: Rebuilt my 2m vertical today

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  1. #21
    'Grumpy old bastid' kb2vxa's Avatar
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    "Writing fail on my part."
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    I can't say what effect a length of coax between the tuner and antenna would have except add its capacitance to the variable thus affecting the minimum capacitance, the tuner was designed to feed the antenna directly and I never saw one used any other way. I wouldn't chance exceeding the breakdown voltage rating of the coax which can easily happen feeding a half wave or multiple thereof, you'll find several kilovolts of RF at the tuner output unless you're running QRP. That reminds me, a variable cap with a decent plate spacing would help. FYI, the advantage of this design over the C-L-C T network is the capacitor rotor is grounded so it may be adjusted hot with no danger of RF burns. The afore mentioned T bites fingers when they contact the knobs set screws. I wish they'd make them L-C-L Ts like AM broadcast tower tuners made that way for a reason not too hard to guess. (;->)
    Last edited by kb2vxa; 07-10-2013 at 08:14 PM.
    "The universe is under no obligation to make sense to you."
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    73 de Warren KB2VXA
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