You said 'everything is grounded' -- but does that include the computer?
Laptops may be difficult to ground because of plastic cases, but perhaps
a screw somewhere in the enclosure can provide a grounding point. The
key is not necessarily 'grounding', but instead bonding all components
(including the computer) with large diameter wire or braid to keep
everything at the same potential.
Plugging the computer as well as the ham gear into the same AC
receptacle is a potential assist to the situation, but as you have
observed, it is not a total cure.
Check the RFI information provided by K9YC at
http://www.audiosystemsgroup.com/K9YC/K9YC.htm, it is an excellent
resource for such problems.
You could try using the 8 kHz RX shift on the KX3 to see if that helps -
again, not the 'cure' but it can assist. Replacing the computer (or its
power supply) may be the only alternative to truely 'fixing' this problem.
73,
Don W3FPR
On 4/18/2013 5:33 PM, AB1SX wrote:
Never noticed it because while setting up the kx3 I was also setting
everything up on my computer. I am a new ham and was getting the logging
software etc all set up. I recently was using the kx3 without the computer
plugged in and the computer was on the other side of the room. I had very
little background noise on the kx3. I finished up what I was doing on the
computer and brought it back to the kx3 (computer was still on) and I
started getting back ground noise, when I plugged it in the noise even got
louder? I then took the computer away from the area and the noise
disappeared again? What's up with that? Everything is grounded. Could it
be because I am plugging the lap top into the same plug outlet as my remote
power? The KX3 is set up as a base station in the house, remote power
source, kx3, antenna tuner and 150 watt amp. Is there a way I can stop that
noise through filters on the kx3? Suggestions would be apprciated.
AB1SX
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