[Lowfer] DK7FC

[Laurence KL7 L]

> On Feb 19, 2014, at 6:53 AM, "pbunn" <pbunn at matrixei.com> wrote:
> 
> 
> I am planning to start construction on a 74 KHz loading coil for my 55 foot vertical antenna. The antenna has a capacitance of about 290 pF at 500 KHz and I assume that will be the same or close at 74 KHz.
> 
> My calculations show that the coil needs to be about 15 mH or so. I have a variometer that is about 400 - 900uH that I will use for tuning.
> 
> The coil form is a section of 20" thin wall PVC duct and it looks like about 240-250 turns gets me in that ballpark. I plan to use #12 stranded THHN - about 1350 feet.
> 
> 
> Does this seem to be "in the ballpark" before I start the winding.
> 
> I'd appreciate any comments. Thanks.
> 
> 
> Pat Bunn
> 
> WG2XLP
> WG2XCT
> N4LTA
> 
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