[ARC5] ARC5/SCR-274N question - L-52 - Correction

[Mike Morrow]

Mike wrote of the T-15 L-52:

> Actually, it is an outer ceramic coil and an inner phenolic 
> coil...similar to the TN-6 antenna tuner coil approach.

Mike, that description must apply **only** to L-52 (ARC-9271) for the
T-15/ARC-5.  Even the T-16 L-52 is conventionally wound on ceramic.
I don't have a T-15 to look at.  Is the inner coil in series with
the roller coil inductance, such that the inner inductance is always
in the antenna circuit even when the roller is at zero?

It makes a little sense, I guess, but it's still surprising.  

The AN/ARC-5 maintenance manual says that only a fraction of one watt
will reach the antenna when using the TN-6 and a short fixed antenna,
but it also says that the TN-6 allows use of short antennas from 1.0
to 2.1 MHz.  So even a TN-6 won't help a T-15 and a short antenna.

One wonders why the T-15 to T-17 exist.  If they were to support actual
aircraft command communications, they were most likely on small aircraft
without trailing wire antennas, and radiating that fraction of a watt.
Larger aircraft could fire up the AN/ART-13 with O-16, and use the
trailing wire.  The documented intended use of these three "special purpose"
transmitters remain one of the more interesting mysteries.

73,
Mike / KK5F