Yes, I operate the station remotely, so there is a fair bit of stuff
attached to the rig including a Windows PC. There probably isn't a good
intentional bond between the computer chassis and the rig chassis. The
current setup is "temporary", so I never got around to bonding
everything to the copper bus bar that I have sitting around waiting to
be put into service. The plan was to do all that once I finish
remodeling the inside of the cabin where the station resides. At the
rate things are going, however, I should probably go ahead and install
the buss bar. "Temporary" is turning into years. That said, the receive
spurious seems to be new. I would have noticed it before if it had been
a longstanding problem.
I did move the Astron RS-35 that powers the K3S off my UPS a few weeks
ago. There was an issue where UPS output was dropping for no apparent
reason. It doesn't appear to be the battery which holds the reduced load
up fine if you pull the plug. I need to troubleshoot that further, but
for now it seems to be working fine with the reduced load. It is a
recent configuration change, so it's possible that the spurious is
somehow related.
73, Mike W4EF................
On 12/3/2023 7:41 PM, David Gilbert wrote:
Is your K3S connected to a computer (or some other significant piece
of electronics), and if so, are they tightly and closely bonded
together chassis wise?
73,
Dave AB7E
On 12/3/2023 8:11 PM, Michael Tope wrote:
Hi All,
I noticed when operating the ARRL 160 contest this weekend that my
K3S has developed a nasty case of what appears to be some sort of LO
spurious. When tuning across strong signals, I can now hear a
low-level buzz (like phase noise reciprocal mixing) as I tune off
them followed by a distinct tone peak 400 Hz off the fundamental
frequency (as if there is a discrete spurious at that offset from the
carrier frequency). I had noticed that a few days or weeks ago on one
signal and dismissed it as being someone with a dirty transmit
signal. After tuning across a number of strong signals on 160 and
seeing the same phenomenon, it is clear that the problem is coming
from my rig.
I don't know if the problem is showing up on my transmit signal as I
haven't received any reports that I have a dirty transmit signal. I
just listened to my carrier on a WebSDR and it sounds clean and I
don't see any sidebands on the waterfall, so I think it may be
confined to receive only.
So far I have been troubleshooting this remotely over the internet,
so I haven't had a chance to twist knobs or look at the hidden menus
carefully. Any ideas as to what might be causing this? Is there some
problem common to the K3S that manifests itself like this?
Thanks & 73,
Mike W4EF...................
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