The picture below is of the CNS1 with Aerial Tuning Indicator on top, the control panel in the upper cabinet followed by the CNS1 transmitter and then the CNS1 receiver. We apologise for the quality of the picture but it is all we have, even though we have the handbook.

This very small set  - 1' 4" deep x 2' 4" high x 1' 2" wide was designed to be fitted with the Transmitter Type TW12 and its associated receiver the Type 394G. R/T could be used on this set but it was rarely [if ever] fitted for such. The CNS1 could be operated as a separate unit having its own source of supply voltages.

The drawing above is our block diagram of a large pull-out schematic of the total [as designed] system of both equipments working in unison together.
The salient points of the CNS1 are shown below but the TW12/394G is shown separately in the transmitter/transceiver scuttle matrix.

The system dates from 1940.

CNS1 Transmitter Frequency Range 8-20 Mc/s covered in four bands
a.  7.3-9.7 Mc/s
b.  9.25-12.3 Mc/s
c.  12-16 Mc/s
d.  15.5-20.6 Mc/s
NOTE: The frequency range of the TW12 is 375-500kc/s, and 1200-3000kc/s in seven pre-selected frequencies.

Power Output: CW 40/50 Watts to aerial circuit; MCW 20/25 Watt to aerial circuit modulating at 80%. Ranges from 200 miles to potentially world wide at times.

Crystal Control, 4 fitted for use, with a further four fitted when new frequencies were required. The third harmonic is used.

An LC Master Oscillator was provided but stated as being required for emergencies only.

Modulation for MCW is achieved using a 1kc/s oscillating valve which is introduced on the suppressor grid of the output RF valve amplifier. 

CNS1 Receiver Frequency Range 8-20 Mc/s covered in two bands
a.  8-13 Mc/s
b.  13-20 Mc/s

Standard superhet receiver with 6 valves
a.  HF amplifier
b. Frequency changer
c. IF amplifier - 600 kc/s IF
d. 2nd detector, AVC and LF amplifier
e. BFO
F. LF output valve

The receiver, like all others, radiated, but the radiations were curtailed to be .1μV/metre at 1 nautical mile.