Thanks for the good advice, comments below
"chuck" wrote in message
ink.net...
Hello Scott,

I assume you can hear the interference on the SSB's speaker when the power
brick is operating?

Yes, but only when it is plugged into the laptop

I also assume the laptop is connected to the SSB via a serial port (or
equivalently, to a TNC which in turn is connected to the SSB).

No, not from the tranceiver serial port, but directly from the ICOM 802's
control panel headphone jack to the laptop soundcard's mike input via a mono
audio cable.

If yes to both, try disconnecting the laptop from the SSB/TNC to see if
you still hear the noise.

The interference stops if I unplug the brick's lead to the laptop, even if
the brick is still plugged in to shoreside power.


If the noise goes away, then Meindert's suggestion may help. You can find
clamp-on ferrites at Radio Shack. Use several turns per the instructions.
It would be best to install at least one on the serial cable just before
it connects to the SSB. Ideally, that would choke off any RF on the cable.

If the noise is unaffected, the interference is probably being radiated.

If you are using the laptop's internal soundcard, then the audio lines to
and from the SSB should also have ferrite chokes.

I guess my next step is to try ferrites on the audio line. .



Running the laptop on internal batteries should completely solve the
problem (while adding another, of course).

Yes to both,
thanks

Scott

snip