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LA1787M
Pin Descriptions
Pin No.
Function
Description
Equivalent circuit
VCC
62 pin
ANT
RF
AGC
An antenna damping current flows
1000pF
1
Antenna damping drive
when the RF AGC voltage (pin 2)
reaches V CC – V D .
100 ?
1
300 ?
1000pF
VCC
100 ?
A13555
FET
2nd GATE
12k ?
2
RF AGC
Used to control the FET
second gate.
+
2
DAMPING
ANT
DRIVER
N
AGC
DET
KEYED
W
AGC
DET
VCC
AGC
A13556
3
F.E.GND
VCC
4
4
OSC
Oscillator connection
25pF
VT
20pF
2k ?
A13557
7
VCC
AM first oscillator
7
AM OSC
This circuit can oscillator up to the
SW band.
An ALC circuit is included.
ALC
A13558
Continued on next page .
No. 6655-6/54
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