[Elecraft] Monitor noise

[George, W5YR]

Paul, first thing I would do is to remove that common "ground" connection
between the computer and the rest of the station equipment. In fact, if you
can, plug the computer into a different branch circuit from that used for
the radios.

I separate my radio and computer and audio equipment this way and then use
isolation transformers in the soundcard audio lines in and out. 

Have you tried other computers/monitors? Is the problem unique to either of
yours?

Lots of angles here, but that common "ground" (which is just a connection -
not a "ground" at all) strikes me as not only unnecessary but probably a
major cause of the problems.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437


pjhend@ameritech.net wrote:
> 
> I'm nearing the end of my rope.......
> I've been trying to "noodle through" the problem of horrible noise to my
> K2(and other HF rigs) from my Compaq Presario MV500 computer monitor. I
> picked up a boatload of snap-on and varried ferrite beads of all shapes
> and sizes and installed them on every cable coming in and out of the
> computer and monitor and power cables to the radio and computer. There
> was no change in the noise which is 7khz wide and appears every 50khz or
> so on almost every band. (Also, my radio and computer equipment is
> grounded to a ground strap connected to a cold water pipe 4' from my
> operating desk. )
> 
> It seems that the problem might lie in the design of the monitor, but
> I'm trying to avoid buying another one. Has anyone had any success
> solving this problem? Or, can anyone recommend a different compatible
> monitor that solved their problems?  Any thoughts on the flat-screen
> monitors?  I'm quite sure that I'm missing oodles of DX hidden behind
> these various "walls of noise" :-)