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Page Title:
Table 2-13. Sidetone Electronic Switch Control |
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|  TM
11-5820-919-40-1
SIDETONE
ELECTRONIC
SWITCH
CONTROL
Input
Sidetone
Enable
Sidetone
Switch
Results
1
Open
0
Closed
The
tune
start
+28v Xmt Enable signal and CW Key
2-86.
Tune Start (
F).
2.
logic is enabled:
signal from telegrapher's key.
The keyline logic is inhibited by the
When the radio is first turned on.
1.
Tune Fault signal.
If not inhibited,
the keyline logic signal from the Key-
2.
When the FREQUENCY KHZ settings
line Control causes Keyline Switch
(except for 100 Hz) are changed on
Q4, Q5 to switch, routing the keyline
the control panel.
signal to the first, second, and third
frequency converters and the power
3.
By the +28v Xmt Enable signal when
amplifier.
the mode switch is reset to voice
transmit or data transmit.
2-89.
100
F Switch.
When Data Enable
is received from the control panel, the
The output of the tune start logic is
100
F switch switches a 100-microfarad
applied to the tune start control which
capacitor out of the third converter cir-
causes tune start switch Q1 to close,
cuits.
The frequency converter uses the
routing the Tune Start signal to the
100-microfarad capacitor for agc release
power amplifier, antenna tuner, and the
time constant.
In voice mode, the agc
synthesizer.
The Tune Start signal will
release time is about 1 second and in
be on (a ground) for a period of 65
data mode it is 0.1 second.
milliseconds.
The
ALC Feedback (Figure 2-8).
ALC In signal is routed from both the
2-87.
Tune Fault/Low Voltage Fault.
power amplifier and antenna tuner.
The
The tune fault generator generates a
power amplifier samples the VFWD from
Tune Fault signal (repetitive beep) when
the harmonic filter and compares it
a Tune Fault signal is received from the
against a +14.5v reference.
The +14.5v
antenna tuner.
The low voltage fault
corresponds to a 20-watt radio output.
generator generates a Low Voltage Fault
When the VFWD exceeds the +14.5v refer-
tone (repetitive click) when the +28v On
ence, the ALC voltage rises.
The audio
from the control panel drops below +20v.
control hybrid reduces the output of the
The outputs of the tune and low voltage
second converter at a rate of 8 db/v ALC
fault generators are routed through the
In.
The maximum ALC voltage is +6v,
receive audio amplifier to the control
which corresponds to more than a 40-db
panel and then to the handset.
reduction of the second converters's
output power.
The antenna tuner samples
2-88.
The Keyline
logic
Keyline.
the radio set output in the tune mode
signal is generated by:
(via the rf sensor bridge) and compares
it against a +2.74v reference.
The
+28v Xmt Enable signal (MODE
1.
+2.74v indicates a 2-watt radio output
switch on control panel set to
from the rf sensor bridge. The audio
V-TR or D-TR) and PTT signal
control hybrid reduces the gain as
from the handset or headset.
above.
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