[Milsurplus] CRV-46123...what it is?...

[Marty R's GI-stuff haunt]

Mike et al.

I've used a DZ-2 here for 2 attempts to copy 17kc SAQ in July.  Neither
successful.  More on this if you write.

The set fascinated me since it has the unique null feature the panel
calls "unilateral."  As well as the prior deal called "bilateral."

Now segue to the B24 "Lady be Good" that overshot it's field & ditched in
the desert.  I believe it must have had the "bilateral-only" SCR-242
RDF (not ADF) based on the BC-310.  If a DZ-2 technology was there, they 
would have known their way.*

Thanks to the thread, I've finally learned the NRL guy's name who's 
theory appeared in the DZ.  This theory is the sense antenna adjunct 
to the the loop.  Sense antenna picks up EM "E vector" & loop the
"H vector" which is 90 deg.s outa phase.  So when an add'l 90 deg.
phase shift added in RX, you can get complete null in only one direction.

DZ-2 has 5-gang variable.  2 gangs for double tuned front-end, one for LO, 
one for mixer input.  The 5th is the 90 deg. psn.  Smart, very smart &
EXACTLY the same physics as todays SMT ADFs.  Tho they did it then with
big-pin tubes.

Now the SCR-269 / BC-433.  Here, I believe, is a GREAT example of adapting
the old to the new.  I contend the front of the '433 is a '310 because
all pin-top metal tubes and the rear is a different TRF-style sense
antenna 90 deg. phase shifter plus.  Plus a discriminator with 2050 
thyratron loop drive circuits.  Later single-ended metal tubes used there.

I said a DZ-2 lived here.  So do all accy.s.  So in the minutia dept. I
submit:

           DZ-2 rx          CRV-46152.

      loop drive            CRV-69066 
           loop             CRV-69065

And on the side-thread on YG-ZB.  Have a living WW2 TBM pilot pal, a
real clear-headed one.  He did '43 on a carier, '44 on island patrols**, 
'45 in Pensacola training.  YG-ZB std. way to find your island.  And
I concur on theory why the ARR-1/BC-946s in Pacific AAF acft.

Didja know a YG-ZB variant used in big invasions to get LSTs to right beach?

And that Navy fleet tugs had BC-659s on deck to talk to the green guys
when they wer pulling 'em back out to sea?

  Marty


 *You could get a "to - from" w/o the "unilateral" helper in an RDF
  by simply getting a null on the RDF then turning the acft rt.  If
  the null "followed the turn," you were heading "to."  
 
  You can do this today using a BC station & an old portable with a 
  long loopstick (sharp null) for verification
 
  "Lady B" discoverers sed navigator position had a doodle pad & lotsa
  comic books.  And as any EE knows, res ipso loquitor
 
**he's my ASB reporter, one Stan Collins.  Stan told the CAF about the
  bungee-mount for ASB indicator under rear dash... drop the display
  when gunner doing primary job.