[Milsurplus] Navigation System

[Unserviceable but Repairable]

Puzzle, puzzle, puzzle

Yo Mike et. al.

This goes on & on about the ARN-7's dad the SCR-269 & how it compared
w. other DF sets around 1943.

You kindly sent me an excerp of the BC-431 manual & it shows that
the BC-433/SCR-269 is same with 2050 thyratron loop/servo-drivers added to
make it an adf... rather than a manual 'unilateral' (one null) df like the
bc-431 or navy DZ  (neat - ed)

What confounds me is that if the one-null manual '431 & automatic '433 
were built by Bendix per legend, why'd the MN-26 manual two-null df 
soldier-on thru the war.  And go on 'til the manual one-null MN-31 
happened later.

Or were the MN-26 & MN-31 concurrent?  And was the BC-433 aka SCR-269 
adf really a Bendix thing at all.

And if the "lady b gud" B24 had a '269 or even a one-null manual
'431 aboard, how cud they have $#@&ed up?  (have 1943 B-24 consist that
sez SCR-269 installed)

Legend is they overflew base.  Might that B24 have had a MN-26??

If it was some jurrasic two-null thing a "turn & watch null precession"
would have eliminated ambiguity.  Lady B discoverers sed navigator's desk
covered w. comics perhaps indicative that flight-deck didn't confide in 
navigator.  Have never seen that theorized.

signed

   the mf question man

(mf -> medium freq. of course)