Gavin
hang in there a bit and solve this one, its quite unusual.? I assume that your antenna has to be connected to hear these stations?
if you happen to have any other power supply (even a gel cell battery), try to see if you still get interference.?
I don't recall you answered how close these stations are??
As Farhan mentioned, check those connections to your volume control.? I think you mentioned these stations appear wherever the ubitx is tuned??
I am also assuming you have successfully used that antenna (I have an EFHW here also) with another rig?? I can presume any antenna fault that would cause this issue, but asking anyway.?
In your photos - I see 2 very unusual coils of wire that maybe you made to try to neaten the arrangement.? I suggest straight runs of wire at the edge of the case - possibly you made yourself a transformer feeding this interference.? try touching each of these coils to see if it goes away.? sometimes careful use of your finger can help with troubleshooting - just don't do this in high voltage tube or AC power supply circuits.?
Curt
