[TowerTalk] Capacitor Value for a 160m T antenna
jimlux
jimlux at earthlink.net
Mon Nov 7 14:03:40 EST 2016
On 11/7/16 10:12 AM, Herbert Schoenbohm wrote:
> You can remove the inductive reactance by inserting an equal value of a
> capacitor in series. The impedance is close enough.
>
>
> On 11/7/2016 1:48 PM, Richard Thorne wrote:
>> 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
>>
In numbers
139 ohms at 1.9 MHz is 139 = 1.9*2*pi*L(uH) = 11.6 uH
139 ohms at 1.9 MHz is 139 = 1/(1.9*2*pi*C(uF)) = 0.6 nF
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