Cut the coax to a common multiple of 1/2 wave length for as many bands as you
can. You can easily get 20-10 with the length you have without losing too much
coax and maybe 40-10. It won't help the loss but will make your readings look
the same on both ends without any further matching.
Stan, K5GO
Sent from my iPad
On Feb 18, 2013, at 7:03 AM, "John E. Cleeve" <g3jvc@jcleeve.idps.co.uk> wrote:
> Good afternoon gentlemen,
>
> A 100 metre(325ft)drum of 75ohm, 25mm(1 inch) diameter coax, and the
> appropriate connectors, has been donated to my GM project, for which I am
> very grateful.
>
> I am considering using this coax as one of the feeders buried to a
> distribution point out in "the aerial field". My question is, from the
> groups experience, would I notice any serious difference in the aerial
> matching etc, between the use of 50 ohm and 75 ohm coax at HF.
>
> I have yet to set up a practical experiment, to measure the loss etc.
> using differing resistive terminations, but that will be done when the
> cable is unwound, before the cable is installed.
>
> I would appreciate your thoughts/experience.
>
> Sincerely, John, G3JVC/GM3JVC.
>
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