Topband: Looking for user experience: DXEngineering Thunderbolt 160m vertical

[Wes]

Or reduce the loading to present a capacitive reactance at the feedpoint and 
shunt it with an inductor.  Functions as a step up L-network and presents a 
ground at DC.  That's what I do here.

Wes  N7WS


On 12/5/2020 7:35 AM, Rudy Bakalov via Topband wrote:
> 
> P.S. If your vertical has a good set of radials, you will see about 35 Ohm feedpoint impedance. You may want to wind your own unun using Jerry Sevick’s cookbook
>
> http://www.introni.it/pdf/Amidon%20-%20Transmission%20Line%20Transformers%20Handbook.pdf
>
> or buy a readymade 35 to 50 Ohm unun from balundesigns.com
>
> The third option is to build a coax transformer per PA0FRI.
>
>
>
> Rudy N2WQ
>
> Sent using a tiny keyboard.  Please excuse brevity, typos, or inappropriate autocorrect.
>
>
>> On Dec 5, 2020, at 8:37 AM, David Aslin G3WGN <david at aslinvc.com> wrote:
>> I'm building a contest station and the time has come to make a choice of 160m TX antenna. Looking at DXE Thunderbolt I note that the capacity hat extends to a significant distance down the vertical section. It's my understanding that will shield some of the radiation from the upper part of the vertical. Alternatives like a vertical tee would not have this issue.
>> Is my understanding correct?
>>
>> I'm considering a commercial antenna as high strength telescoping antenna tubing is unobtanium in UK.  My QTH is an exposed windy location so strength matters!
>> 73, David G3WGN M6O
>>
>>
>>
>> Sent from my Galaxy
>>
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