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Originally Posted by AntEater
Ok, regarding Hohentwiel, it seems it was quite common, but the "Seetakt" devices, I don't know.
If they had been available, and reliable, the whole late 1943 convoy battles would've gone out quite differently. The whole "Leuthen" group basically had the problem that the night attack technique did not work anymore, because the escorts could see them, while they only could detect escorts on RWR, and only escorts that still had metric radar.
And since we can't model a radar that is offline 90% of the times, it is better to leave it optional or out entirely.
That goes for both the Seetakt with fixed and 360 deg antenna.
Hohentwiel is another story. It was an aircraft radar so it was quite compact and more reliable than the earlier sets.
Didn't know about 9D2, but it seems the "drauf" Display was installed at least in other boats than XXI. U 234 had a PPI display for Hohentwiel.
So maybe the best solution would be to have Hohentwiel installed by default in mid-late 1944, and the earlier sets optional.
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Yes, if SH4 doesn't model the ability of Allied escorts to home in on radar emissions, then that's a major shortcoming. Even then, with fully functional radar sets in late 1943, I don't think radar would have made that much of a difference for U-boat attack tactics. Hohentwiel could only pick up targets at about a max range of 7,500 meters, so that presumably leaves the performance of FuMO29 and 30 as much to be desired. Evidence seems to point to radar usage being confined to nighttime during bad weather. Even then, of course, that was very risky, since of course the Allies were homing in on the radar emissions.
For RFB, we have FuMO30 as "default" well after it's first available, and FuMO61 is pretty much the same case. Renown costs for all three radar sets are set very high.
Interesting note there about FuMO65 being installed in U-234. Any idea when it was installed?