D R A F T
D R A F T
D R A F T
Garex Twomobile
9
Handbook
SECTION III
OPERATION
Before operating the equipment, remove the outer case and check that all
valves, crystals, lamp holders and hinged printed circuit boards are firmly
seated in position and that no damage has occurred in transit.
The outer case is secured by the 6BA screw located at the top centre of the
front panel. The feet beneath the case should also be removed by unscrewing
their 6BA screws, to avoid fouling the lower edge of the rear panel. The
unit may now be withdrawn from the case in a forward direction, taking care
that the flange at the top front of the case does not foul components
mounted high in the chassis assembly, in particular the power switch, audio
smoothing electrolytic and voltage regulator panel (if this is fitted above
the modulation transformer).
To reassemble, reverse the procedure, ensuring that the correct number of
packing washers are used on the screws fixing the feet.
The red supply lead must be connected to the positive terminal of the. 12V
DC supply and the black supply lead to the negative. Reversal of these
connections will blow one or both of the 7A fuses. It is important to
ensure that the correct rating and type of fuse is used as a replacement.
The supply voltage for alignment and test purposes is 13.2V measured at the
input to the equipment.
Receiver
Connect a 3—5 ohm loudspeaker to the terminal block on the outside of the
rear panel. With the 12V DC supply connected as above, turn the power
switch to ‘ON’. The green pilot light should illuminate and upon turning
the squelch and volume controls in a clockwise direction receiver noise
should be heard. Connect a suitable antenna (50 ohm impedance) to the
antenna socket. The tuning dial is directly calibrated for the 2 metre
band. Set the Rx mode switch to ‘FM’ or ‘AM’ as required. For general band–
searching it is suggested that this switch be kept in the ‘FM’ position;
signals are then easily located by the quietening of the background noise
when tuned to the centre of the carrier. AM signals are resolved instantly
by switching modes. When receiving frequency modulated signals having a
deviation in excess of ±5kHz some distortion will result.
To silence the Rx noise in the absence of a signal turn the squelch control
carefully anticlockwise until muting just occurs.
Summary of Contents for TWOMOBILE MK II
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Page 13: ...D R A F T D R A F T D R A F T Garex Twomobile 13 Handbook ...
Page 14: ...D R A F T D R A F T D R A F T Garex Twomobile 14 Handbook SCHEMATICS ...
Page 15: ...D R A F T D R A F T D R A F T Garex Twomobile 15 Handbook ...
Page 16: ...D R A F T D R A F T D R A F T Garex Twomobile 16 Handbook ...
Page 17: ...D R A F T D R A F T D R A F T Garex Twomobile 17 Handbook ...