Topband: 160m Vertical matching Help

[Bryon Paul Veal NØAH]

Rick,

what are the ball park figured on the coil diameter???? I'm guessing 5 or 
so inches across is a good place to start

Paul. N0AH

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On November 1, 2017 11:25:42 AM "Richard (Rick) Karlquist" 
<richard at karlquist.com> wrote:

> You need +j34 ohms in parallel with your coax coming in.
> This is about 3 microhenries.  This would be around 6
> turns on your coil if the turns are spaced a wire
> diameter.  IOW, tap the coax 6 turns from the grounded end.
> Then tap the antenna to whatever tunes to 1.83 MHz.
>
> Rick N6RK
>
> On 11/1/2017 9:54 AM, MR TREVOR DUNNE wrote:
>>
>> Hi All
>>
>>
>>
>> I finally got the vertical up and running, problem I have now is I can't 
>> find a low SWR on the coil, the best I can get is about 2.8:1 no matter 
>> where I tap the coil that's the best SWR, I can move that point up and down 
>> the band by moving the tap but the SWR stays the same,
>>
>> My current set up is about 55ft vertical I have 2 loading wires in a T 
>> shape, wires are 50ft either side of the vertical and the are pretty level 
>> and in line,
>>
>> I have 38 radials averaging about 45-60ft long, I will add more when time 
>> allows but don't the make the SWR worse ??
>>
>> With no coil I get resonance at 2.12mhz with R=16 X=2 on my MFJ269,
>>
>> The coil is 25ft of 5mm copper brake pipe in a 4" diameter, the coil is 
>> attached to base of the vertical and the other end is grounded,
>>
>> Any pointers on what I can do to get a better match,
>>
>> Thanks
>> Trevor
>> EI2GLB
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