[Milsurplus] ARR-41

[William Donzelli]

> That's interesting and not too surprising.  There's always some exceptions.

More often than most think. Remember that NEVER and ALWAYS are words
one should refrain from using when it comes to this stuff.

> I'm comfortable with my NO to the question of an AC-powered version of the R-648.  If any of the internal wiring had to be altered, and such modifications aren't documented in the military technical manuals or engineering change notices for the standard equipment bearing the R-648/ARR-41 nomenclature, then it really is no longer an R-648.

Maybe, maybe not. Lots of radios and radars go thru modifications and
do not get any sort of nomenclature change. Looks at World War 2 era
Navy radars - some sets went thru 30 modifications (some fairly
extensive), either to fix problems or to adapt sets to new uses, but
only a few that were given new nomenclatures. This info does not
really show up in the normal documentation, except when new editions
of the books were printed or change notices included.

The AC supplied AN/ARR-41s very likely were made (or modified more
likely) in very small numbers, probably for specific uses, so that
documentation may be lost.

> I would wonder what might motivate such a modification of the R-648 by the military.  I can't think of anything.

Well, it is a handy little general coverage HF receiver, very useful
in a tight space. Perhaps some AN/MRQ weirdness needed a small
receiver, and the AN/ARR-41s were available. Weirder things have
happened (SCR-274-Ns were spec'd and built into the AN/MPN-1 radar,
for example.).

--
Will