[OKDXA] Impedance Bridge?

[Kim Elmore]

Hi Bill,

Given that I know 1.8 MHz is below the resonant frequency, I find it 
hard to comprehend how the antenna could present an inductive 
impedance (but then, I've been known to suffer from limited 
comprehension...). Even so, I tried a series capacitor, to see if I 
could cancel out the series inductance and had zero luck. Whatever 
the impedance is, it's high and, I have to think, capacitive.

73,

Kim N5OP

At 08:13 PM 2/24/2008, you wrote:
>Hi again, Kim:
>
>I'm just north of Stillwater.  The figures could be correct for the
>shunt-fed tower.
>
>73, Bill, N5TU
>
>-----Original Message-----
>From: okdxa-bounces at mailman.qth.net [mailto:okdxa-bounces at mailman.qth.net]
>On Behalf Of Kim Elmore
>Sent: Sunday, February 24, 2008 6:53 PM
>To: okdxa at mailman.qth.net>
>Subject: [OKDXA] Impedance Bridge?
>
>Does anyone near Norman have an impedance bridge I could use? I need
>to figure out what the feed impedance is of my short, shunt-fed
>tower. I have a Palomar noise bridge, but the reading I get from it
>is nonsense: 65 + j685 ohms. The sign that cannot be right, because I
>know that the resonant frequency is ~ 9.5 MHz.  Since I want to make
>an L-network to match it, I need to know what the feed impedance is
>so that I can build what I need.
>
>Whatever the impedance is, it's way out there. My Ameritron ATR-15
>cannot match it at the low end of the band and neither can the
>built-in tuner in my Orion II.
>
>Kim Elmore, N5OP
>
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