On 4/1/2012 8:01 AM, Richard Thorne wrote:
> All coax, connectors etc are brand spanking new.
This does, indeed, have flaky connection written all over it. What kind
of connectors? Who installed them, and how? Soldered or crimped? If
crimped, proper tool used?
For troubleshooting -- first thing I would do is to stick an antenna
analyzer on the coax at the shack at a time when the connection is bad
and find all the impedance nulls. What you're doing is observing the
behavior of that bad line as a stub. Go down as low in frequency as your
analyzer will work, then stick those numbers in a spreadsheet to find
possible lengths to the fault. Do the calculation both ways -- that is,
assuming both a short and an open at the other end, although an open is
the more likely possibility.
This ought to get you within 5-10% of the cable length to the fault.
Another point -- BEWARE OF JUNK CONNECTORS, BARRELS, AND OTHER
ADAPTERS. I have had EXACTLY this sort of failure with junk
connectors. Any connector other than an Amphenol should be viewed as junk.
73, Jim K9YC
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