Thank, Roger.? Well, I did a lot of moving things around and unplugging items.? It is used with a desktop, so the only way of going off the grid is with the UPS I use for it when the power goes out.? I do have a separate lithium ion 12V battery I could use with the Softrock.? I may try this later just to see what happnes.
I was fortunate to find a couple of more snap on RFI ferrite cores.? After placing them over every cable relating to the SDR, it appears that the broadband 30 Khz noise was greatly reduced. Not totally gone, but a lot better than it was.? I still have to be careful where I place my keyboard when not using it because I get a lot of interference if anywhere close to any of the Softrock cables.? And I have cores around the keyboard wires too.
toggle quoted message
Show quoted text
On 5/20/21 5:12 PM, Roger wrote:
Jon,
Since it does not change when an antenna is removed that does suggest the noise is coming in over one of the connections.
Can you run everything on battery and disconnected from the outside world? That is, run the Softrock from a 12V battery and use a laptop running on battery? Even a transformer based power supply will allow coupling of RF that can be difficult to filter out.
The noise still could be coming over the air (not thru a wire). Can you make it better/worse by moving the Softrock around, putting your hand around the case, touching the ferrite transformers on the board? Things could be radiating RF through the AC lines, or ethernet cables, or broadband coax cables. WIFI routers and cable modems can cause RF havoc. Unplugging your cable/wifi system would be a simple test for that. And turn off the wifi on the computer you are using to run the Softrock.
73,
Roger
On May 20, 2021, at 12:15 PM, JonI via groups.io <ji425bt@...> wrote:
I mentioned this in the video- does not go away. Thanks.
On 5/20/21 3:01 PM, Nick wrote:
What happens if you disconnect the antenna?
Do you still see the noise?
On 20/05/2021 15:32, JonI via groups.io wrote:
I made a short 3 min video describing and showing this interference:
Would really appreciate the group's help in solving it and thanks in advance.
Jon
