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" <[email protected]> > To: "ZR" <[email protected]> > Cc: "HAROLD SMITH JR" <[email protected]>; <[email protected]> > 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" <[email protected]> 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" >> <[email protected]> >> To: "N7DF" <[email protected]>; <[email protected]> >> 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 <[email protected]> >> 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
