Dave,
The KX3 is designed to be operated with the preamp on most of the time.
The only reason to turn it off is when extremely strong signals are
encountered.
The preamp eliminates many spurious signals that are actually out of
band due to its signal rejection "filtering". That has nothing to do
with the sensitivity, and it can kill extraneous results such as you are
seeing.
If it makes those responses substantial with the preamp on, then there
may be a problem to be addressed.
73,
Don W3FPR
On 7/16/2017 10:07 PM, Dave Sublette wrote:
Good point. However I am on 20 meters, which really doesn’t need the preamp.
Besides, the spikes are 40 dB high or so. No, this behavior is definitely
looking like a failure. I have one more thing to try. I will carry it out to
the shop in my garage and plug it in. If it is the same there as in here, it’s
not any external influence. Thanks for hanging in there with me.
73,
Dave
On Jul 16, 2017, at 9:56 PM, Dale Boresz <[email protected]> wrote:
Dave, make sure that the preamp is engaged on your KX3. If the preamp is off and you are
receiving on a quiet band, you'll see "stuff" that would normally be covered by
the band noise. Turn on the preamp, and the artifacts that you're seeing should be pushed
below the noise floor of just about any band.
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