Frequency Range Transmitting Set Receiver Outfit
85-95Mc/s Type 682 Transmitter 7AM AP W7944 CDK [Receiver P40] AP W7945A
65-85Mc/s Type 682M Transmitter 7AM Transmitter AP53175 CDQ [Receiver P40] AP 56187A

It is used on handcarts, vehicles, and other craft as the main or supplementary equipment. It may be installed with or without remote control and may be set up for SIMPLEX or DUPLEX working.

It is crystal control and operates [TX and RX] on pre-determined spot frequencies.

Power requirements are LT 12V @ 3 AMPS/HT 330V @200mA DC. The microphone and modulator require 4V @ 30-40mA DC.

Power output was 7 - 10 Watts.

A station set up to use Type 682 and outfit CDK or Type 682M and outfit CDQ, requires, in addition, one or more of the aerial outfits AGU, AGY, AGW, AGP or AGO, which are supplied separately, and one or more of the following outfits:-

In its time [1945] this set can either be thought of as 'simple' or 'very sophisticated', the latter having every conceivable device option fitted to the Type 682/Type 682M. The FACILITIES available were as follows:-

FUNCTION OPERATION
Simplex Available with either local or remote positions.  In both instances HT switching of the transmitter is carried out by means of the pressel switch in the handset.
Duplex Operation is available with either local or remote positions. HT switching of the transmitter is or is not possible at the handset according to the outfit used. With duplex operation, the radio station can be connected to a field telephone exchange so that any extension of this exchange can speak over the radio link.
Teleprinter Teleprinter operations of a duplex link is possible. This requires a teleprinter, teleprinter terminal unit, teleprinter rectifier unit and an S + DX MkII in addition to the outfits described.
Relay Where 2 complete installations are fitted in close proximity to one another, as in Radio Van 29, the installation may be linked together so that what one station  receives can be re-radiated on the other circuit and vice versa. 

 This file shows the general layout of the 682 system 682.pdf
and here is the full connections 682 2.pdf
and once more for duplex linking 682 3.pdf