IC-7100 noise from remoterig

[HB9CVN-4F3CV]

hello,

just set up a IC-7100 with the remoterig. Serial 0300454 so used the additional board to be placed instead of the red strap at the control side.

The radio switches on but there is a tremendous noise, which increase if I turn any knob of the front panel.

I have tried to reduce the codec out gain as suggested in another discussion but the only result is that I have the overall volume reduced but with the very same noise.

www.youtube.com/watch?v=tK2icjQsMF4

Any suggestion on how possibly attack the problem?

Thanks in advance for any help

[HB9CVN-4F3CV]

found out that the problem is generated by a switching power supply I've used to supply the remoterig unit.

Using a conventional one made the problem disappear.

I have nil idea on how that could possible happen...

[PD1IM]

nice you find it and it was so simple.  have fun with it.  use it 2 weeks in month