ZR, Bruce and Bob, thanks for your info. There's the problem..... I was
using the white ones and didn't know the black ones are UV resistant.
I'll check those out.
ZR, I need to use tie wraps in my case. I am not, currently, using PVC
so I need something that will not make electrical contact which hose
clamps would in my case. But that is a good point you make about that
thing. If I change my design, which is indeed likely, I will definitely
think about using your idea along with PVC.
In general, I have avoided using PVC for anything RF...... those tests
years ago where the PVC pipes melted and the resulting pictures kind of
left a lasting impression that is hard to fight. LOL. I'll get over
it, but if you saw the same pictures those many years ago, you would
definitely understand why I have avoided it to date :)
Mike (AB7ZU)
On 8/17/2012 7:42 AM, ZR wrote:
> Using PVC pipe and their matching T's there is no need of tiewraps. A
> couple of hose clamps just above the T will hold them in place.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Mike Armstrong" <armstrmj@aol.com>
> To: "ZR" <zr@jeremy.mv.com>
> Cc: "HAROLD SMITH JR" <w0rihps@sbcglobal.net>; <Topband@contesting.com>
> Sent: Friday, August 17, 2012 10:10 AM
> Subject: Re: Topband: Threading radials
>
>
> ZR and HAROLD, I have been having issues with the tie wraps breaking
> in the AZ sun. I suspect the UV is getting to them badly. The metal
> ones don't break, but I can't use those for shunt feeding, of course.
> Can you recommend a source for ones that don't break? It is a real
> pain replacing them every year or two...... He he he
>
> Mike A (AB7ZU)
>
> Kuhi no ka lima, hele no ka maka
>
> On Aug 17, 2012, at 6:48, "ZR" <zr@jeremy.mv.com> wrote:
>
>> At a prior QTH in the 80's I used 3/4" PVC pipe and T's to support a
>> length
>> of 3/4" CATV hardline as the shunt feed. A single piece of #12 didnt
>> work
>> well at all at any spacing using bandwidth and pileup busting as the
>> criteria.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "HAROLD SMITH JR"
>> <w0rihps@sbcglobal.net>
>> To: "N7DF" <n7df@yahoo.com>; <Topband@contesting.com>
>> Sent: Thursday, August 16, 2012 10:28 PM
>> Subject: Re: Topband: Threading radials
>>
>>
>> I find that 1/2 inch PVC pipe is handy for many things. It can be cut
>> into
>> 6"
>> spacers or insulators. I use it for spacers on my Shunt Fed tower's
>>
>> shunt feed rod. I used 1/2" EMT for the shunt feed rod and the PVC
>> spaced
>> about
>> every 24" to stabilize the rod. I use Black Tie-wraps to
>>
>> secure everything.
>> 73 Price W0RI
>>
>>
>>
>> ________________________________
>> From: N7DF <n7df@yahoo.com>
>> Subject: Topband: Threading radials
>>
>> I have found that 20 foot lengths of 1/2 inch PVC pipe works very
>> well in
>> getting radial wires through, around and under the very prickly
>> shrubbery
>> that
>> gets in the way here in the New Mexico desert. It is very inexpensive
>> and
>> can
>> be extended to as long a run as is needed.
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1424 / Virus Database: 2437/5204 - Release Date: 08/16/12
>>
>>
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2437/5204 - Release Date: 08/16/12
>
>
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|