Topband: Hairpin match to inverted L?

[Mark - N5OT]

Plastic bottles are the coil form of choice on DXpeditions.  Excellent.

Mark N5OT


On 9/3/2019 5:55 AM, ly2ij at qrz.lt wrote:
> Hi Pete,
>
> Here is picture of coil I made to tune Inv. L at 9Y4 with 15-20 Ohm impedance. It was tuned in 2 steps:
>
> 1. calculate and wound coil to rise R close to 50 Ohm
> 2. adjust horizontal wire length back to desired freq.
>
> https://photos.app.goo.gl/7eVBt5t8yCAvsaZg7
>
> Used thin wire for coil, not sure if it is right or not, used what I had there.
>
> 73
> Arunas LY2ij /LY5E
>
>
>
> 2019 m. rugsėjo 1 d., 21:47 val., "N4ZR" <n4zr at comcast.net> parašė:
>
>> The other day a ham friend suggested using a coil ("hairpin") to match
>> the low impedance of a well-radialed inverted L to 50-ohm coax.  This
>> struck me as a potentially-attractive alternative to a series vacuum
>> capacitor, but I don't know enough to evaluate it. Thoughts?
>>
>> -- 
>>
>> 73, Pete N4ZR
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