[R-390] More dweedle-dweedle

[blw]

Roger,

I had forgotten about Kamtronix. Thanks for reminding me. Interesting.

Have you thought of shielding your computer in any way? Most likely, it is
the monitor doing the hash damage. You can first reorient your monitor to
minimize RFI. Second, ground it below your radio ground connection on the
way out. That helped me tremendously a long time ago. I am very lucky right
now as my computer and 17" monitor is only about 2' from the rack and
antenna inputs. I get no RFI at all. Shutting down or starting up creates
zero noise. There is another computer about 4' away with no problems. I feel
very lucky in this regard. The older TV way across the room wreaks havoc no
matter what I do.

You can put a can around the card if you need to. It shouldn't hurt
anything.  Should be easy to make and most cards have little holes in the
boards for things like that. Or, glue down some aluminum foil on the inside
of the case of your computer if you really want to shield it. There are
spray on chemicals you can find. Normally, it doesn't take much to shield
something in a computer. Monitors are a different story. Older hard drive
and CDROM motors can be bothersome.


Barry


> I use a Kamtronix for both CW and TTY. This outputs ASCII
> on a serial port. My quest was to find a computer that
> would run the DOS terminal program and that did
> not radiate so much RFI from the monitor and power
> supply so as to swamp my weak antenna input.
> 
> I like my KAM. It is 10 years old or so.
> 
> Today I am looking at sound cards and software.
> I finally found a computer that is quiet RFI wise
> and had ability to load windows.
> 
> I wonder how much RFI sound cards generate.
> Maybe my case will contain it.
> 
> Roger KC6TRU