Hello Hans,
Problems with BS equipment could have been an excessive sensitivity (not necessarily larger bandwidth), detecting emissions whose power was far too low to get back to emitting ship and/or insufficient crew training in interpreting pulse strength (or fatigue/stress).
Excessive sensitivity has never been a problem, you merely turn down the gain. It doesn't matter whether you are tired or fresh as a daisy, there will always be a point where signal cannot get back to source. That is radar 1.01. Receiving radar impulses never means you
have been located, merely that you may be. It is probably almost impossible to assess an absolute value of radar pulse strength, but I should imagine much easier to detect diminishing strength as the range from Suffolk extended from 11 to something like 70 miles during the early hours of 25th May. That is if there was anything aboard Bismarck which could detect 50cm transmissions, the likelyhood of which has also diminished rapidly toward zero.
In December 1942 Burnett used centimetric radars that escaped German detection, but this is another story and has nothing to do with BS
With respect, it gas everything to do with Exercise Rhine. Hepcke claims a specification for Bismarck in May 1941 which is unachievable for R203 or R600. He is so uncertain he says "probably" a Metox, contradicting his own knowledge of those systems, in other words he doesn't really know, and then this super specification is still unachievable 18 months later. Unachievable in Dec 1942 is the same as unachievable in 1941. Besides since we know Suffolk is using Type 284, how can Bismarck detect her pulses and count her shadowers when Kummetz cannot do the same 18 months later.
As I have pointed out previously, it is likely Holland used the same ploy as Burnett, refusing use of PoW's Type 281 and hoping for Type 284 coverage of the stern sector, showing he and his staff had a good grasp of the nascent art of electronic warfare. (This phrase was so good in my article, it has already been "stolen" by one published author.)
All the best
wadinga