D R A F T
D R A F T
D R A F T
Garex Twomobile
2
Handbook
SECTION I
INTRODUCTION
The Garex Twomobile is a transmitter–receiver for operation in the 144–
146MHz amateur band.
The receiver is fully tunable over the entire band and is capable of
receiving both amplitude and frequency (or phase) modulated signals. A
fully transistorised double superheterodyne design is used, incorporating a
squelch circuit to eliminate background noise in the absence of a signal.
The appropriate detector for FM and AM is selected by a switch mounted on
the front panel. FM reception employs an integrated circuit quadrature
detector.
The transmitter has a nominal input power to the final power amplifier of
15
watts.
The
audio
and
oscillator/modulator
units
are
ful1y
transistorised; the multiplier/driver and. power amplifier stages use
quick–heat twin tetrodes. The modulation system (phase or amplitude) is
selected by a front-panel switch, which is independent of the receiver mode
switch, thus readily allowing cross–mode working.
The equipment is designed to operate from a nominal 12V DC supply,
conveniently supplied from a vehicle battery. For fixed-station use, a
mains–driven power supply delivering 12V DC (stabilised) at 5 amps maximum
is required. (Under standby conditions the current consumption is about
0.25A.)
All of the operator’s controls are mounted on the front panel. An external
loudspeaker is used, any 3 to 5 ohm type being suitable.
THIS DOCUMENT
This handbook was produced by M1FDE using notes and manuscript supplied by
GAREX which I asked if I could publish. This is almost the document they
would have published, but publishing this document is my responsibility and
all communications regarding errors or further information should be
addressed to M1FDE.
A.N. Martin
M1FDE <at> G0MWT <dot> ORG <dot> UK
This document is DRAFT and preliminary and details are tentative. It will
be updated WHEN I’ve MADE ONE WORK.
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 ...