||Type 682 Transmitter 7AM AP W7944
||CDK [Receiver P40] AP W7945A
||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
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
- Control Outfit KSC - for simplex working only.
- Control Outfit KSD - for duplex working with NO LINKING outfit
- Control Outfit KSF - for duplex working WITH a LINKING unit
employed - this outfit is required where the AUDIO input and output are
to be extended for other purposes e.g. connection with a field telephone
exchange or relaying through another circuit.
- Aerial Switching Unit Outfit ESC - for simplex working only.
In its time  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:-
||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.
||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 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
||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
and here is the full connections 682 2.pdf
and once more for duplex linking 682 3.pdf