[Antennas] 160 vertical capacitance question

Sun Nov 13 12:24:55 EST 2005

My server with NEC on it is down, or I'd run this for you, but an 
alternative is to use an autek bridge... find the RE + IM parts at some freq 
on 160... and calculate the appropriate transformation to make it 50 ohms. 
It's too short by far for 160, so it will need some series inductance at the 
base, plus some cap to ground to complete the transformation.
Sincerely,
Dr. William J. Schmidt, II K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC
Email: bill at wjschmidt.com
WebPage: www.wjschmidt.com
"It's not what you take with you... but what you leave behind that counts. 
Live each day as if it were your last."
----- Original Message ----- 
From: "Peter Veach" <n9qzd at spbbs.com>
To: <W0DXZ at aol.com>; <antennas at mailman.qth.net>
Sent: Sunday, November 13, 2005 4:55 AM
Subject: RE: [Antennas] 160 vertical capacitance question
>I think you are going to need inductance at the base, not capacitance.
>>> -----Original Message-----
>> From: antennas-bounces at mailman.qth.net
>> [mailto:antennas-bounces at mailman.qth.net]On Behalf Of W0DXZ at aol.com
>> Sent: Friday, November 11, 2005 1:52 PM
>> To: antennas at mailman.qth.net
>> Subject: [Antennas] 160 vertical capacitance question
>>>>>> I have a metal pole, insulated from ground (a vertical antenna)
>> about 50
>> feet high, with 4 ,4 foot long capacitance hat rods on it (get
>> that?) How to
>> feed it, etc?
>> I plan on feeding it with either,,, coax, or "open wire line", 300 ohm.
>> Now, the question is, I think I have to add some capaitance at
>> the base of
>> the vertical... how much? I was thinking of adding a 350mf
>> variable,,, is
>> that the right ball park? Then running the coax or whatever into
>> a tuner in the
>> shack. Hoping the 350mf will get it close,.,, any help?
>> I have this great vertical, just dont know how to feed it,,,
>> 73 Bob W0DXZ
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