[Milsurplus] Federal Marine Unit

[Hue Miller]

I have one of the 'emergency crystal receivers' from such a marine unit - 
think it is a 2B,
not sure where it is right now.  The circuit is only slightly more 
sophisticated than you'd
expect - it uses a tuned series primary, and tuned seconday - pretty much 
same circuit
used in the Heathkit CR-1 crystal radio.  I had thought maybe I'd pull off 
turns of the coil
til it tuned the AM broadcast band, but maybe I'll just let it alone and 
sell it off. As it was
built to insert into the front of the marine unit, to the left of the 128A 
receiver, it has no
actual cabinet.

BTW, looking at a Navy pub last night, I see it says NO Hallicrafters 
product was considered
"safe" to use on oceangoing ships, except the SX-28 with an add-on 
suppressor 1X381 - anyone
know what that was?
I also see that also nixed were: W.E. 227A  (sorry, Dave ), RCA AR-8501 and 
AR-8504
regens, Mackay 117 regen, and Sargent's regens. No listing at all of the 
SW3.

Now I'm wondering if the 'unsafe' receivers already on ships were just 
'secured' from
operating during the voyage - as we have discussed, convoy communications 
did not
actually depend on the cargo ships using MF / HF radio.  It would have been 
too much
of a complication and drain on production, I believe, to update all the 
installed equipment.
-Hue