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CIRCUIT DESCRIPTION
The function of these circuits
is
to generate routed to the receiver circuitw.
Q406
provides additional
crystal-controlled injection signals, and to mix these signals gain, and the resulting signal is applied to the premix
with the VFO signal to obtain the premix signal. balanced mixer.
~iodes
D427, D428, D429,
and
D430
form a balanced
0401, 0402. Q403,
and
Q404
are used as oscillators. These
mixer, which combines the HFO and VFO signals to create
oscillators are
diodeselected,
as are the proper oscillator
the premix signal. The output of the balanced mixer is
crystals. filtered by diode-selected
bandpass filters, and amplified by
Q407.
The resulting output is used
to
drive the transmitter
The crystal oscillator signal is amplified by
0405,
and and counter circuits.
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