[Elecraft] Beam antenna question

Vic Rosenthal k2vco.vic at gmail.com
Sun May 21 00:45:57 EDT 2017


The TH11DXX that G3TXQ compares to the Hexbeam has at least 3 elements on each band and is a modern design, no traps. If someone found that the C3 (2 el on each band) outperformed it, I would be very suspicious that something was wrong with the sample tested.
I did look at the wrong picture and you are correct that the XR5 is 9 elements.

Vic 4X6GP 

> On 20 May 2017, at 23:28, Joe Subich, W4TV <lists at subich.com> wrote:
> 
> 
> > Why do you think it will "significantly outperform the hex beams?"
> 
> Based on the performance data (K7LXC/N0AX) for the original Force 12
> C3 and TH11 with comparisons of the broadband Hexbeam and the TH11.
> The K7LXC/N0AX field data shows the C3 outperforming the TH11 while
> G3TXQ's web page <http://www.karinya.net/g3txq/hexbeam/broadband/>
> shows the TH11 with approximately 3 dB advantage over the broadband
> hexbeam.
> 
>> I wouldn't say an 11 element yagi with capacity hats on the elements
> > has an especially low visual profile!
> 
> Neither the XR5 nor the Navassa 5 has 11 elements *or* capacity hats.
> The XR5 is a 9-element antenna and the Navassa 5 has 10 elements as
> documented in the two links I provided.
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
>> On 5/20/2017 3:34 PM, Vic Rosenthal wrote:
>> Why do you think it will "significantly outperform the hex beams?"
>> The point about uv is well taken re fiberglass, but I don't know what the cords on all the hexbeam versions are made of. There are uv resistant materials available.
>> I wouldn't say an 11 element yagi with capacity hats on the elements has an especially low visual profile!
>> 
>> Vic 4X6GP
>> 
>>> On 20 May 2017, at 19:36, Joe Subich, W4TV <lists at subich.com> wrote:
>>> 
>>> On 5/20/2017 11:32 AM, Terry Brown wrote:
>>>> These beams are not cheap,  I don't want to be taking the beam down
>>>> and replacing main structural components every 5 yrs.
>>>> 
>>>> Can anyone with a hex beam comment on this?
>>> 
>>> Your concerns are well placed with antennas made of fiberglass and
>>> dacron/kevlar cords.
>>> 
>>> Instead of a hexbeam, I would recommend looking at the Innovantennas
>>> XR5T: <http://innovantennas.com/antennas-a-accesories/on-line-shop/view/productdetails/virtuemart_product_id/435/virtuemart_category_id/55.html>,
>>> or the JK Antennas Navassa 5:
>>> <https://jkantennas.com/jk-navassa-5.html>
>>> 
>>> Both have boom lengths of 12 feet or less, cover 20 - 10 meters and
>>> have optional 6 meter add-ons.  Either should significantly out
>>> perform the hex beams and - since they are aluminum antennas that do
>>> not use UV sensitive fiberglass, kevlar and dacron components - should
>>> significantly outlast the hexbeam with significantly less maintenance.
>>> 
>>> 73,
>>> 
>>>  ... Joe, W4TV
>>>> 
>> 


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