Topband: Coax issues

MU 4CX250B 4cx250b at miamioh.edu
Wed Feb 19 00:21:09 EST 2014


Hi Gary, use the distance-to-fault mode in your MFJ 259B. I believe it
is in the advanced mode section. Most likely the problem is at the
connector at the far end of the coax.

73,
Jim w8zr
Sent from my iPhone

> On Feb 18, 2014, at 10:14 PM, Gary Smith <Gary at ka1j.com> wrote:
>
> Something happened tonight with the coax and now the SWR is very high
> on all bands. The Coax is 350' of RG213/U, it runs under the leaves &
> is buried under the snow. It terminates into the remote switching
> section of an Ameritron RCS-8V where the 5 outlets lead to 5 separate
> wire antennas.
>
> I connected a dummy load to the coax in the shack and checked the
> coax at the remote switch with a MFJ-259B analyzer and the SWR was
> above 6. I replaced the connector at the shack end with no benefit.
> On 160M where it normally resonates at 1.4 it now reads 7.5
>
> As it happened tonight & was working till a couple of hours ago, I
> looked for signs of an animal's digging in the snow along the route
> the coax takes but saw nothing like that. I'd hate to dig up the
> whole length of coax to try and find the affected area with the
> ground frozen. I still haven't found any hardline and it would be a
> waste to buy new coax when I'm wanting to have hardline instead.
>
> Is there is a way the information available in the LP-100A in the
> shack or the MFJ-259B can be used to locate the defective area?
>
> Never a good time for coax/antenna problems, in the snow is not a
> plus.
>
> Thanks!
>
> Gary
> KA1J
>
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