Alinco DX-70, Service Manual

Page: 39 / 116

29)
m
PC1037GR (XA0379)
Double Balanced Modulator
Vcc
cz
1
•c
TJ
8
Carrier Input
Outputl
cz
2
O
7
ZZ2
Bypass
Output
2
cz
3
5
o
3J
6
I D Signal Input
NC
tzz
4
(MS)
5
ZZ}
GND
Vcc-
6
-OV
Characteristics Symbol Condition
Min.
Typ. Max. Unit
Circuit current lee No signal
-
12
16
mA
Conversion gain
Gc
Signal: 70mV r.m.s. 1.75MHz
Carrier: 100mV r.m.s. 28.25MHz
Output: 30MHz
-2
0 +2
dB
Signal leakage Ls
- -40
-20
dB
Carrier leakage
Lc
-
-32
-20
dB
Inter modulated distortion
IMD
Signal 1: 42.5mV r.m.s. 1.75MHz
Signal 2: 42.5mV r.m.s. 2.00MHz
Carrier: 100mV r.m.s. 28.25MHz
Output: 29.75MHz
-45 -35 dB
Signal input impedance Zsi
500//9 n//pF
Carrier input impedance
Zci
1
.GW9 -
kO//pF
Output impedance
Zol Output 1
350//7
n// pF
Carrier input
Bypass