[Milsurplus] Command Set Receiver Coffee-Grinder

[Unserviceable but Repairable]

There's been endless discussion of operational ideas on the "radio range"
And fer sure, that's all a pilot needs.

But a little theory might help here.  Exchange so far reminds me of the Jonathon Winters
skit where several saucer observers try to "describe the martian."  Everyone's
got a different idea.  

Tho the John Achor paper seems close.

One such "radio range" was in Indian Hill area of Cincinnati & led to a Lunken Apt 
approach.  Remember it as a kid, but can't remember the tower count.

An Adcock of itself has two dipoles .25 wave spacing & fed by a tapped .75 wave
transmission line harness.  Techie blah, techie blah, techie blah.

Result is cancellation of outgoing wave in one direction, 3db gain in other - or
when viewed fm above, a cardiod.

A four tower system would make electric sense if only one approach was served.  As
in the Lunken sense.

Someone, Clete perhaps, wrote the transmitter sent a continuous AM tone a short time, then 
was off a shorter time.  During the 'on time,' the transmitter was switched between
Adcock pairs resulting in an A when "off the beam" to one side, or an "n" if off
to the other side.  Ingenious.

If coming in "on the beam," the continuous tone was heard.  And if above the system you 
were in the "cone of silence" which I believe might have been better called the cone 
of misinformation.

Why?  Because near-field effects must have been such that if you were close by, nothing
in the way of As or Ns could be observed.  Just the long-on then short-off tone.  That's 
for you & ur xtal set George.

Now back to the Indian Hills radio range.  Around 1960 a Lockheed Lodestar fumbled
an approach near the thing & went in the ditch just missing a grade school.

Deceased pilot considered a hero because if he took a chance & tried to clear the school &
succeeded, he'da made Lunken

  'rm

Surp. talk:  I've a ARC-5x 12V Q-5er with antenna & loop connections but no uni-lateral
             ckt. as in DZ.  So loop use must have been restricted to null-readings
             showing line to range or NDB.  Turn-then-wait-then-2nd-check procedure
             wuda been all one cud do.   Must have been designed for a GI Aeronca or 
             Luscomb observation plane, dontcha think?

             Haven't taken time for the critical matter of checking whether a C-230 
             C-260 plugs up the front "hot pocket"  Mea culpa.