[ARC5] 18S-4 Now and Later - Control box circuitry

[Mike Morrow]

> Some time in the distant past I've seen a USAF manual on the 18S-4.

True.  The USAF used the commercial model 18S-4, and also the JAN nomenclature
model RT-380/AR, part of AN/ARC-59...a military 18S-4A.

> Seems as though I recall that the control box for the ART-13, and in particular
> the one for the ART-13B model which has not only the 10 position channel switch
> but also an A-B toggle switch -- easily added to a non-B head -- to give a total
> of 20 channels, is a very close (if not exact) match for the transmitter control
> circuitry.

But it is no match for the control for the 18S-4, with the BFO TUNE control and
sensitivity pots.  Those are found on the controls for the 18S-4 sets:

314S-4 Control Box
314S-6 Control Panel (a.k.a. C-1982/AR for the AN/ARC-59) 

> The receiver control circuit is probably dip-simple, with a gain control or two
> (RF-AF, maybe ganged like in the BC-348),

The 314S-4 control *box* has separate RF and AF gain controls...but the 314S-6
(C-1982/AR) control *panel* has them ganged together.  There is a BFO TUNE
pot on both.

> ...a BFO switch (if the thing works CW, and I forget whether that is)...

It has CW mode.  The MODE switch has CW, CW STANDBY, and PHONE positions.

> ...and a phone jack.  And let's not forget the mic jack and a pilot lamp.

There are no jacks on the 314S-6 panel, of course.  But on the 314S-4 control
box there are MIC, KEY, and two PHONE jacks.

> If you intend to run it on the dyno, I'm betting you will probably give that
> idea up very quickly once you hear it wind up the first time.

Not if one is accustomed to AN/ART-13* dynamotors.  Which Meir definitely is.  :-)

73,
Mike / KK5F