Page 301
X-RAY
VIEW
'-OLTAGE
CHART
(Shown from component side)
(Shown
from
component side)
RECEIVER
VOLTAGES
b20%1
NOTES:
1.
POWER
SUPPLY
AND
4n
SPEAKER
CONNECTED
2.
ANTENNA
NOT
CONNECTED
3.
BAND
SWITCH
IN
3.5
POSITION
4.
RF
GAIN
MAXIMUM
CLOCKWISE
5.
AF
GAIN
MAXIMUM
COUNTERCLOCKWISE
6.
OC
VOLTAGES
MEASURED
WITH
20
KILOHM
INPUTVOM
TO
CHASSIS
.
(z
1)
DC
VOLTAGE
WITH-SWITCH
IN
m,
e.
OR
EPOSlTlON
The function of this circuit
is
to amplify the predriver Diodes Dm3 and D904 route the driver output to the
output to a
lwel sufficient to drive the power amplifier. low-pass filter (low power mode) or to the power amplifier
(high power mode). These diodes are controlled by the relay
Transistors
0901 and 0902 are used in a push-pull, class
AB
switching line in conjunction with the HI switch.
linear
configuration. D901 and D902 are used to provide
proper operating bias. Gain flatness across the range
is
Diodes Dm5 and D906 sample and rectify a portion of the
provided by the network at the input of the driver.
driver output, producing a voltage used for
ALC
in the low
power mode.
To Next Page
Loading...
