Hi Steve
I can't really answer your question abt using RG6 for tx - altho it
looks as stout as RG58 and RG59. I would guess the insulation between
the shield and center conductor is the key. Whether it would hold up to
substantial RF.
I would suggest an alternative. The same sources that use RG6 in the US
also had spool ends of 1/2" 75 ohm hardline. Certainly it will handle
the RF as it's the buried cabling of choice on both of my low band
arrays. We simply built a 1.4:1 unun to handle the impedance difference
- altho one could really ignore it being so close to 50 ohms.
We got all of ours for hauling it away. And with fiber optic being the
current choice, there should be surplus long runs available at near
nothing in cost. Hopefully in Perth as well.
Only residuals were the large wooden spools and I gave those away by
placing them near the local road and spray painting "free for good
picnic table" on them!
Hope you and the family are well and surviving the Aussie winter okay?
Regards to all
73 George W8UVZ
Steve Ireland wrote:
>
> G'day
>
> Down here in Western Australia, RG-11A 75 ohm cable seems virtually
> unobtainable these days - and VERY expensive on the rare occasions when you
> can get it. However, RG-6 75 ohm triple- or quad-screened cable is cheap
> and easy to come across, thanks to the growing number of cable TV
> installations.
>
> As a result, I am considering using RG-6 of this kind for an transmitting
> antenna project, but would like to know about:
>
> 1. Its (typical) velocity factor (have you every tried asking a TV cable
> supplier what the velocity factor of a particular TV cable is?...)
>
> 2. What sort of power it can typically handle (the cable may have to handle
> something of a mismatch).
>
> Any information direct to me would be much appreciated.
>
> Vy 73,
>
> Steve, VK6VZ
>
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