Re: Beam antenna question

Posted by Igor Sokolov-2 on May 21, 2017; 4:14am
URL: http://elecraft.85.s1.nabble.com/Beam-antenna-question-tp7630845p7630875.html

Joe,

Reality sometimes differ from calculations.

XR5T has shortened 20m elements and pretty poor F/B as compared to Hex.
Last year we were operating in WPX contest from Madeira, CT9 and had 2
antennas up on 15m band. One was 4 el Op-Des 15m full size monobander
from Innovantennas. Another one was Hex. Both installed at the same
height of 10m above the ground. We were surprised to find out that Hex
had been always outperforming 4el Innov into Eu and the USA. so we ended
up using only Hex.

Besides XR5 is 3 times heavier them Hex and much more visible (let it's
price alone).

BTW is somebody wants a pair of these 4el 15m full size monoband
Innovantennas, they are for sale, stored in Madeira, and we are selling
them for 50% of their original price.

Fiberglass spreaders of our Hex are coming from Maxgain and UV
resistant. So are wires and ropes. All bolts and nuts are made of
stainless steel.


73, Igor UA9CDC


20.05.2017 21:36, Joe Subich, W4TV пишет:

> 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
>
>
> On 5/20/2017 11:32 AM, Terry Brown wrote:
>> I really appreciate all the comments.  I do have a follow up
>> question:
>>
>> An aluminum beam can be left up for years. I was reading one review
>> of a particular hex beam and the poster said that after 4 years,  the
>> cords holding the beam together had become brittle and started to
>> fail from UV exposure and the main support members had deteriorated
>> for same reason.
>>
>> 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?
>>
>> Thanks, Terry
>>
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