Ex. BBC England EE 9410 1950z 12Feb-1997 455 Program "Newshour" by man NJ-USA
*SIO code for reception of DX radio stations:
S(ignal Strength) I(nterference) O(verall merit)
1 = barely audible extreme very poor / inaudible
2 = weak severe poor
3 = fair moderate fair
4 = strong slight good
5 = very strong nil excellent (local quality)
The BDXC British DX Club adds a J after the SIO code if
jamming is present - e.g. 423j