[Milsurplus] A design challenge

[J. Forster]

A DESIGN CHALLENGE:

Background:  During the recent WW II weekend at Reading, PA, Chuck was operating
a WS 19 set re-enacting a WW II signals setup. He had problems sending code
without being able to hear what was being sent, because the WS 19 does not have
side tone provisions.  What is needed is a code practice oscillator and speaker,
which is gated by a sample of the RF output of the transmitter, built out of
parts appropriate to the period, such as might be available to someone in a
field workshop in WW II.

The concept is to power the device in the same way the Crystal Calibrator is
powered, via the 3 pin Jones connector on the dog bone. + 12 VDC (at up to an
amp or two) and +265 VDC (at up to 10 ma) are available via this connector.

Ideally, the unit would have a volume and a pitch control and pick up the RF (2
to 8 MHz at 10 to 15 watts) via a small antenna or capacitive or inductive
coupling to the aerial lead.  A tuned device is not necessary.

NO MODIFICATION TO THE SET ARE PERMITTED.

We would like to use appropriate valves (tubes) such as:  6K7G, 6K8G, 6B8G, 6H6,
12SC7. Note some these are 6 volt filament.

Put you designer hats on. If we find or create nice design, we'll post it on the
web site for all to see.

This could be fun,
-John