General; Filter (0955-0634) - HP 8970B Service Manual

Fault-Finding Tips

General

General
The Option 20 front end is relatively easy to fault find because it is a combination of
defined RF components.
Instead of using the noise source it is possible to use a signal generator to inject a signal
and then trace the signal levels through the RF paths to the 300 MHz second IF using a
spectrum analyzer. It is much easier to do it this way because the signals can be seen on
the spectrum analyzer display.

Filter (0955-0634)

The specifications on this part are:
Table 5-1: 2050 MHz Low Pass Filter Specifications
Frequency
10 MHz to 2050 MHz
2.35 GHz to 3.85GHz
3.85 GHz to 13.0 GHz
13.0 GHz to 26.5 GHz
The best way to measure this part is to use a network analyzer. An alternate way is to use
a spectrum analyzer, e.g. 8593E with a tracking generator or a separate sweeper.
Verify over the frequency ranges above that the insertion losses are correct.
5-2
Insertion Loss
< 0.5 dB
> 35 dB
> 65 dB
> 50 dB
HP 8970B Option 020 Service Manual Supplement