Another thing to suspect is noise generated by a computer, or ethernet
modems and routers and being routed to the K3 and P3 via the K3 to
computer connection. I believe that is why Tom suggested winding the
USB cable through a type 31 ferrite core. BTW, that core should be near
the computer end).
Disconnect and power down the computer to see if that is contributing to
the "spurs".
73,
Don W3FPR
On 11/27/2018 5:57 PM, ab2tc wrote:
Hi,
Absolutely no sign of any of these spurs here with my K3S. Since they are at
constant frequencies they must be coming in through the K3 front end (*not*
at the IF level). So either your K3 front end is generating them (which it
shouldn't) or they are present in your environment. Again, since they are at
constant frequencies, the P3 or any other SDR connected to the K3 IF output
should not be the culprit. Send me an E-mail and I will give you spectral
plots collected with LP-PAN/NAP3 with K3 connected to a well shielded dummy
load.
AB2TC
tomb18 wrote
This is pretty common. One thing that can help is to wrap your USB cable
through an ft241 31 to rid. About 6 turns gets rig of lots of picked up
garbage. 73 Tom
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