[TowerTalk] Right coax for my station?
Jerry Boyd
k6bz@c-zone.net
Mon, 1 Dec 1997 04:37:02 -0800
Hi Scott,
Congrats on being almost done. 9913F is good stuff, but I don't think
given the relatively shorts runs you have that I'd use it except for the
VHF antenna. Good RG 8 or equivalent (213) should do fine. In fact for
40/80/160 (slopers off the tower or inverted "V"'s ???) you can run 8X.
One of my towers is about the same height and distance as yours and I have
a C-3 on it. I use RG 8. I have slopers for the low bands on that tower
which I feed with 8X. Sure if you've got $$$ to burn use hardline. But
you'll do just fine with less expensive coax given the short runs.....use
the change to buy momma and the little one an extra XMAS present.
Thanks for the webpage. I visit it a lot.
73
Jerry
K6BZ
----------
> From: Scott Neader KA9FOX <neader@centuryinter.net>
> To: towertalk@contesting.com
> Subject: [TowerTalk] Right coax for my station?
> Date: Sunday, November 30, 1997 5:42 PM
>
> OK, guys, you aren't done with me yet! The tower is up, and the beam is
> pretty much ready to be raised to the top. BUT, I still need to buy coax
> cable!
>
> Most guys I talk to are using RG-213 or are the hard core types with 7/8"
> Heliax. I'm thinking about using Belden 9913F (tnx WE9V for the idea). It
> is like the typical 9913, but instead of an air dialectric, it is
filled...
> and it is more flexible.
>
> About the install: My tower is 72 feet tall and roughly 25 feet to the
> radio room. The C4XL beam takes two feed lines (one for 10-15-20, and
one
> for 40), plus I'll need runs for a two meter beam (and maybe 6m), and
> whatever I decide to do for 80m and 160m.
>
> My question is... is the 9913F overkill, especially for whatever I do on
> 80m and 160m (and maybe even 40m)? Should I go with the cheaper RG-213
for
> the lowbands? The AES catalog has the 9913F for about 60 cents per foot,
> compared to about 37 cents per foot for RG-213. More info about the
Belden
> 9913F:
>
> Per Belden, in latest AES catalog:
>
> --------
>
> New 9913F High-Flex RF Transmission Cable: This low-loss RG-8/U type
> coaxial cable is a high-flex version of Belden's popular 9913. It offers
a
> stranded center conductor for improved flexibility and flex life, a
> patented high-flex cut and abrasion resistant jacket and a high felocity
> foam insulation
>
> * CENTER CONDUCTOR: 10 AWG (19x23) .108 bare copper (stranded)
> * INSULATION TYPE: Foam Polyethylene (cellular polyethylene)
> * JACKET TYPE: PVC
> * SHIELD: Duobond II + 90% tinned copper braid; 100% foil shield
> * NOMINAL IMPEDANCE: 50 ohms
> * VELOCITY FACTOR: 83%
> * DIAMETER: .405 inch
> * NOMINAL CAPACITANCE: 24.5 pF/ft.
> * LOSS PER 100 FT: 1.3db @ 100Mhz, 2.8db @ 400Mhz
>
> Amateur Electronic Supply PRICE:
> 100 feet roll: .80 cents per foot ($ 79.95/roll)
> 250 feet roll: .64 cents per foot ($159.95/roll)
> 500 foot roll: .60 cents per foot ($299.95/roll)
>
> -------
>
> Chad, WE9V, was nice enough to run these numbers for me, for comparison
of
> different cable types:
>
> 150' run on 10M, 1500 watts to coax:
> 7/8" 50 ohm 1439 out
> 3/4" catv 1371 out
> 9913 1202 out
> RG-213 991 out
> RG8X 778 out
>
> For 80M, 150' run, 1500 watts
> 9913 1385 out
> RG-213 1320 out
> RG8X 1186 out
>
> For 2M, 150' run, 50W to coax
> 7/8" 50 ohm 45 out
> 3/4" catv 40 out
> 9913 28 out
> RG-213 19 out
> RG8X 10 out
>
> -------
>
> Thanks, in advance, for your advice!
>
> 73 - Scott KA9FOX
>
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