Craig- This was a good contribution- But- I have a question or two about
the 9913. one- did you use common 9913 or one of the more weather-proof
varieties- two- if common 9913, how did you treat it to improve the
end-sealing?
Thanks- Bill-W4BSG
At 02:51 PM 7/1/2005 -0400, Craig Clark wrote:
> > 1. crank ups and coax (George M. Badger, III)
>
>Hello George et al,
>
>For most HF applications, a good RG213 is more than adequate for feeding
>antennas on a crank-up tower. That said, with my Tri-ex W67, I used Davis's
>Buryflex: since I sell it, why not use it.
>
>I cycled my tower ever year to lubricate the top bearing and eye-ball the
>connections to ensure that they were water tight. The Bury-flex was up for
>years and showed no signs of degradation from water or UV rays and was not
>damaged when the tower crashed, hi hi.
>
>Standard LMR400 is not the best choice as it has a solid center conductor.
>If you want to use LMR, use UF which has a stranded center conductor. The
>loss numbers on LMR400 and Buryflex are about the same. Bflex is a bit more
>expensive due to its burial grade outer layer of plastic.
>
>When you engineer the coax you have to take in to account the length from
>the shack to the base of the tower and then up the tower. I chose to secure
>the coax and rotor cable to the standoffs so you had to calculate the
>length of each loop. I found this to be better than letting the cable have
>free run.
>
>I ran a low loss coax, 9913, from the shack to the antenna switch at the
>base of the tower. I then ran Bflex to each of the antennas. I had on this
>tower:
>
>Cushcraft:
> X-7
> 5 element 6 meter
> 19 element 2 meter
> 146/440 dual band vertical
>
>I can't imagine using RG214 unless you already have it. Especially if it is
>silver plate. $$$$$
>
>Good luck.
>
>
>73, Craig Clark, K1QX
>
>RADIOWARE AND RADIO BOOKSTORE
>PO BOX 209
>RINDGE NH 03461
>603 899 6957
>WWW.RADIO-WARE.COM
Bill Aycock - W4BSG
Woodville, Alabama
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