Hi John,toggle quoted messageShow quoted text
I assume that you are using a computer connected to the radio since you are running WSJT-X AND CAT. It may be the computer that is being tickled by stray RF.
How is your RF ground configured? The shrortest cable possible to a good earth ground is desirable but may have a length that presents a high impedance to ground for RF at one or more bands. Before you put a lot of effort into that (assuming you already have some sort of grounded cable) try to connect your computer 'common' to the same RF ground you use for your radio. At least bond the radio chasis ground and computer ground. If I don't have that RF ground included on the computer frame I have some nasties that show up too.
The suggestions in the other replies this far are good too.
On 07/20/2018 08:24 AM, John wrote:
bark less - wag more