Is this the SD radar scope?

[jdkbph]

Interesting...

That link you provided says this:

Long-wave aircraft warning sets. SD-a, SD-1, and SD-2 are installed on submarines and give range only. SD-3, for small auxiliaries, supplies range and bearing. All sets are equipped with "A" scopes, and have provisions for IFF (identification) connections.

And that has always been my understanding. SD uses an A scope.

Now I know that early SJ used an A scope as well, but more familiar (in connection with SJ) is the PPI introduced in '43 I think.

That's why I associated the A scope in SH4 with SD and the PPI with SJ. There is no reason that I know of to run both displays simultaneoulsy for any one system... ie, it makes no sense to say both the A scope and PPI are for the SJ.

And that leads me to believe the current SD implementation (system is always on, no display - just a text type contact report) is a last second hack job and not a real "as intended" fix.

Thoughts?

JD