1. After carefully unpacking the receiver, remove the dust cover
make sure that all valves and screening cans are firmly in place
and that no packing material remains within the tuning mechanism.
2. Ascertain that the mains transformator is set to the appropriate
voltage tapping. This is carried out by means of soldered connections
to the transformer. A power lead is permanently fitted to the
can be connected directly to the power supply. Check that the
and HT2 situated on the main chassis are linked (unless the L.F.
is in use).
3. Ensure that the rating of the supply fuse and the h.t. fuse
Supply fuse 2A.
H.T. fuse 350, anti surge.
4. The impedance at the aerial (antenna) input plug is designed
match into a 75-ohms unbalanced transmission line. The cable
termination supplied with the receiver can bee provided with alternative
sleeves to enable it to be used with a type UR.18 or UR.70 cable
cables of nominal 1/2-in or 1/4-in. respectively.
5. A number of audio outputs are available to give the following
(1) The two telephone jack sockets situated on the front panel
are connected across one of the 600.ohms, 3mW outlets.
(2) The following outputs are connected to the terminal strip
at the rear of the receiver:-
(a) Three 600-ohms outlets at 3mW.
(b) One 3-ohm outlet at 1W.
(c) One 600-ohms outlet at 10mW. This output is
controlled by a preset A.F.LEVEL control on
the front panel and is independent of the
outputs previously described.
100 kc/s I.F. OUTPUT.
6. The connection consists of two coaxial plugs connected in parallel
to the 100 kc/s output. The total load should not be less than
(e.g. with one out let loaded by 75-ohms, the other can be can
as a high impedance source).
EXTERNAL INPUT/OUTPUT CONNECTIONS.
7. The following input and output connections are available on
at the rear of the receiver (fig.1):-
1 Mc/s input/output: May be used diversity operation.
2nd V. F. O. output/ For diversity operation and external
input(3.6-4.6 Mc/s) channelizer crystal oscillator output.
1.7 Mc/s input/output For diversity operation and fine tuning
R.F. (2-3 Mc/s) input: Input from an L.F. converter.
The above input/output connections are selected by internal linkage,
the connections should be made as follows:-
1 Mc/s input - Remove "T" adaptor and place in clip
provided on side of gusset plate.
Connect the free plugs PL12 to SKT3 and
connect the free plug PL2 to SKT2.
1 Mc/s output - Disconnect plugs PL12 and PL2 and connect
"T" adaptor to socket SKT2. Connect plugs
PL12 and PL2 to the "T" adaptor.
2nd V.F.O. input - Connect the free plug PL302 to SKT302.
2nd V.F.O. output - Connect the free plug PL303A to SKT304.
1.7 Mc/s input - Connect the free plug PL303A to SKT303.
1.7 Mc/s output - Connect the free plug PL303A to SKT306.
When using the internal oscillators with crystals, the connections
should be made for outputs since the cable capacity will pull
internal crystal off frequency.
The 1 Mc/s and 1.7 Mc/s crystal must be removed if an external
is applied to the input socket. Stowage space is provided on the
chassis for the crystals they are not use.
AUTOMATIC VOLUME CONTROL.
8. The a.v.c. line is broughtout to the terminal strip at the
the chassis for such applications as diversity reception.