GAREX TWOMOBILE MK II, Operating Manual, Page: 10 / 18

D R A F T D R A F T D R A F T
Garex Twomobile 10 Handbook
TRANSMITTER
Do not operate the transmitter unless an antenna or dummy load is connected
to the antenna socket.
Select the appropriate crystal by setting the channel switch on the front
panel. Turn the power switch to ‘SPOT’ and tune the receiver to the nominal
transmitter frequency. A strong carrier should be heard. Reset the power
switch to ‘ON’, when the carrier should disappear.
Select the required transmit mode, listen briefly to the receiver to verify
that the selected channel is clear, then press the transmit button on the
microphone. It should be possible to hear a whine from the DC converter.
Wait for approximately one second for the quick-heat valves to reach
operating temperature, then speak at normal voice level across the face of
the microphone at a distance of 2—3 inches (do not speak directly at the
face of the microphone).
When first using a particular sntenna system the transmitter should be
correctly loaded to the antenna as follows:
using field strength meter or reflectometer (VSWR meter) adjust the antenna
trimmer (accessible through the side of the case) for maximum radiation.
The Twomobile transmitter is designed for intermittent operation, and
especially when using amplitude modulation, long periods of transmission
should be avoided. If used as a fixed station, where long periods of
transmission are more prevalent than under mobile conditions there is some
merit in reducing the power input to the final power amplifier by about 20%
(see Tx adjustments). Adequate ventilation, especially of the PA and driver
area is essential.