Rcv Audio iS
through one of the following switches:
received from the third frequency con-
audio-electronic switch, data electronic
verter and routed to the agc buffer and
switch, and sidetone electronic switch.
the receive audio amplifier.
Audio input level is controlled by Rcv
Audio level adjust R12.
The output of
Voice and CW Operation.
voice or cw operation, the audio elec-
the agc buffer (a voltage follower) is
routed to the agc generator in the third
tronic switch is closed, routing the
audio From Vol control Wiper to one of
The Rcv Audio is
routed through the receive audio ampli-
the differential inputs of the first
fier to the control panel. The level
stage of the receive audio amplifier.
of the Rcv Audio output of the receive
This signal controls the level of Rcv
audio amplifier is controlled by the
Table 2-11 describes
level of the signals which are routed
the audio electronic switch logic.
Data Operation. During data
through the data level adjust to the
operation, Data Enable from the control
input stage of the receive audio
panel opens the audio electronic switch
amplifier. This signal controls the
and closes the data electronic switch.
level of Rcv Audio.
Refer to table 2-12
The To Vol Control signal is routed
for data electronic switch logic.
Sidetone Operation. During trans-
closes the sidetone electronic switch,
mit operation, the Xmt Audio is routed
and a portion of the Xmt, Audio is routed
through the sidetone level adjust to the
to the receive audio amplifier.
sidetone electronic switch.
2-13 describes the sidetone electronic
Enable from the power amplifier