Chapter 2 85
Making Adjustments
13. Third Converter and Second IF Bandpass
13. Third Converter and Second IF
Bandpass
This adjustment applies to:
All 8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
The 321.4 MHz, second IF bandpass filter is adjusted for maximum
signal amplitude.
The CAL OUT amplitude is measured and adjusted for −20 dBm
±0.4 dB. The insertion loss of a low-pass filter (LPF) and 10 dB
attenuator are characterized. The harmonics of the CAL OUT signal
are suppressed with the LPF before the amplitude accuracy is
measured using a power meter.
Equipment Required
Synthesized sweeper
Microwave spectrum analyzer
Measuring receiver (used as a power meter)
Power meter
Low power sensor with a 50 MHz reference attenuator
Power sensor, 300 MHz
Power splitter
Attenuator, 10 dB, Type N (m to f), dc-12.4 GHz
Low-pass filter, 300 MHz
IF test board
Cable, Type N, 152 cm (60 in)
Cable, BNC, 120 cm (48 in)
Test cable, SMB (f) to BNC (m) (two required)
Adapter, APC 3.5 (f) to Type N (f)
Adapter, Type N (f) to BNC (m) (two required)
Adapter, Type N (m) to BNC (f)
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