Xc=1/(2*Pi*f*c)
For 1825 kHz, C = 628 pF, leaving 41.2 +j0.
But, that doesn't get you to Zo = 50. But this does...
Hi-Pass L option: 285 pF series C with 6.1 uH shunt across Zo=50 input
side; loss = 0.02 dB with QL = 200.
Or...
Low-Pass option: 574 pF shunt across load, 6.8 uH series L; loss = 0.09 dB
also with QL = 200.
Both answers assume high quality caps with very high Q and coil Q at least
200.
Paul, W9AC
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Richard Thorne
Sent: Monday, November 7, 2016 12:48 PM
To: Towertalk <towertalk@contesting.com>
Subject: [TowerTalk] Capacitor Value for a 160m T antenna
I'm going to build a T antenna for 160 in a few weeks.
I need a capacitor to tune out z = 41.2 + j139.
For the educational experience, how do I calculate a cap for the above
equation? I'm going to try and track down a variable cap for the above so I
can build the antenna over the Thanksgiving holiday.
Thanks
Rich - N5ZC
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