[Milsurplus] Jurrassic air-nav / was TCS in PT

[Unserviceable but Repairable]

Firstus, the Smit's Enoler Gay has it right - TNX  MIKE  HANZ.
'Way to go, but it don't haul peeps for support.

Neat point is it's air-nav '733 & ARN-5 is still certifiable for 
category-1 landings by jfor's glorified drivers.

Amazing that system's persisted for a half century.  And 'system' is
thus.  Forgive me if a there's a bad detail or nit - like using a
metric screw in a C47 nacelle.

'733 runs ~108mc & shows 'left' for 110 hz tone thru one of it's
2 band-pass-filters.  Shows right for 150hz, etc.  This is how
localizer's work - look out window next time u ride the plane
& smell the yagis.

ARN-5 works like '733 but @ 335 mcs & is for up-down glide slope.

ARN-5 all 28V stuff so u just shoot the juice to it bruce (n. norvous)
& it shud go (not so dyno-pwr '733 / be careful)  If you're lucky
& have the battery-pwr TS313 w. acorn osc., u can see if all's well

OR u can take a URM-26 & external audio & do same test. 

Interesting fable about overweight 733.  Designed by British &
bilt xtra tuff to stand the constant foggy-landing crashes.

75mc marker beacon.  Once, before glide-slope, there were 3 markers,
now just 2.  Cud do fair substitute for glide slope but u had to
be better than good.

BC400 was std glide-slope TX & used a trip-815 deck called a TU-75.
Get where the 75 comes fm?  I had one as a kid & only recently
found this factoid.

AZON & CRN things used same 75mc area & one TX, the BC-1158 used a TU-75.
So there was VERY  SMART cross-polination by our electronic
ancesstors.

But you knew that.