Kevin,
Your logic is flawless as long as everything in the KAT2 is working
properly. Yours apparently has some ills.
For instance, if one of the relays is not working, that could leave an
inductor or capacitor in the circuit at all times, or if you have a bad
connection somewhere in the KAT2, that would account for your problem.
I have seen repairs where a BNC jack had its ground pin vaporized
(perhaps by lightning) - tough to diagnose, but it would not work until
such things were located.
.
My suggestions are for the beginning steps of checking everything in
your external setup first. If the dummy load is not 50 ohms pure
resistive at the operating frequency, your measurements will be
misleading. If the coax has a problem, you end up with incorrect
conclusions. Overlook nothing, things of that nature have been problems
with similar behaviors before.
"Know your tools and know that they are operating properly before using
them" - quote from one of my college lab professors, and it has not
failed me yet, but has 'saved my skin' several times.
73,
Don W3FPR
On 7/12/2013 5:41 PM, Kevin Cozens wrote:
On 13-07-10 10:42 PM, Don Wilhelm wrote:
There is one possibility that your 51 ohm load (measured at DC) is not a
good 51 ohm pure resistance at the frequency you were measuring.
Borrow an
antenna analyzer and test your load at the frequency of operation.
I seem to have thrown people off by including the mention of tuning
the KAT2 with a dummy load attached as it is not relevant to the
problem. I stated that I set the K2 to calS mode which is supposed to
put the KAT2 in to bypass mode according to the manual. The only
effect the KAT2 should have on the incoming signal should be minimal
based on stray L/C. The 10 fold drop in signal just doesn't seem right
to me.
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