Front End - HP 8970B Service Manual

Front End

2050 MHz LPF
J1
Limiter
10 - 2047 MHz
Limiter (on 08970-60125
Input Assembly only).
Suppresses externally
generated transients.
HP 8970B Option 020 Service Manual Supplement
Figure 1-2: HP 8970B Front End Schematic
10 dB 20 dB 10 dB
INPUT ASSEMBLY
2-7 GHz Isolator
600 MHz
10 dB
Detector
Diode
Output
3.910 - 5.947 GHz
4.5 GHz LPF
3.6 GHz
X 6
2nd Convertor
Block Diagram and Parts List
Front End
J2
2 dB
J5
J3
J4
YTO Output
3.9 GHz
300 MHz
To A4 Assy
1-3