[TenTec] OT: Openwire/Window Line and Bad Wx

Phil Sussman psussman at pactor.com
Mon Jul 29 09:20:02 EDT 2013


I also use openwire feeder with 4" spacing. Rain, snow, ice, wind, hot, cool,
the tuner usually doesn't have to be adjusted. (Unless it's unusually hot or
cold)

73 de Phil - N8PS

PS. I agree with Scott. I had a tree limb brushing the wire antenna and I
didn't notice it -- until my XYL pointed it out. Seemed to have no effect,
however.

---

Quoting Scott Harwood <scotthsr at earthlink.net>:

> That was a great article.  I'm a huge fan of open wire also.
>
> Last year I had a contractor doing some work in my side yard and he  
> actually tied back my open wire line to an aluminum gutter using  
> plastic cable ties.  I did notice I had to re-tune one day, but the  
> guys I talk to on 75 meters said my signal had been as strong as  
> usual!  I didn't discover the tied down line until a week later  
> while checking out his work in the yard.  Go figure.
>
> Scott K4VWK
>
>
> -----Original Message-----
>> From: Rick - DJ0IP / NJ0IP <Rick at DJ0IP.de>
>> Sent: Jul 29, 2013 4:54 AM
>> To: 'Discussion of Ten-Tec Equipment' <tentec at contesting.com>
>> Subject: [TenTec] OT:  Openwire/Window Line and Bad Wx
>>
>> I extracted this topic from the other thread on the Model 238.
>>
>> How does bad weather affect openwire compared to its effect on window line?
>> Lots of opinions, lots of myths.
>>
>> Bob Allison (WB1CGM) and Joel Hallas (W1ZR) tested this to find out.
>> Their results are reported in the November 2009 issue of QST on page 66.
>> See: http://www.dj0ip.de/spiderbeam-1/spiderpole/pole-base-mount/ and then
>> select "W1ZR" as author and "2009" as year.
>> Unfortunately you have to be a member of ARRL to download this and it is
>> copyrighted, otherwise I would post the download on my web.
>>
>> Summary, for 95 ft. of feedline (the length they tested), the change is
>> negligible in both.
>> It is ever so slightly worse with window line, but less than 0.2dB.
>> NEGLIGIBLE!
>>
>> The real difference is, true openwire changes it impedance only slightly
>> when wet, whereas the window line changes more and generally requires
>> re-tuning the matchbox.
>>
>> One word of caution, which should be obvious:  Neither are suitable for
>> running along the ground, whether wet or dry!
>>
>> Being an operwire fanatic, I personally found this to be one of the most
>> useful articles ever published in QST.
>>
>> 73
>> Rick, DJ0IP
>>
>>
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