Installation guide

Troubleshooting
Troubleshooting Non-Harmonic Spurious
1-105
Sampler Spurs Option UNJ and
Option 506
These spurs are generated when the sampler IF
frequency, divided by two, equals a harmonic of the
sampling frequency.
The most likely cause is the
A15 Sampler (Option UNJ or Option 506).
F/2 Spurs All These spurs are exactly one half of the RF output
frequency.
If these spurs occur, perform the VCO Bias
Potentiometer Calibration. If the spurs still occur,
the most likely cause is the
A17 Synthesizer (Option 501, 502, 503, 504) or the
A16 Frac-N (Option UNJ or Option 506).
Comb Feedthrough Option UNJ and
Option 506
These spurs are harmonics of the sampling
frequency and are at an absolute frequency, not at
an offset from the carrier.
The most likely cause is the
A15 Sampler (Option UNJ or Option 506).
WCDMA Option 400 These spurs are offset spurs that are generated
when the WCDMA modulation format is running.
The most likely cause is the
A7 Baseband Generator (Option 001 or Option 002).
Baseband Generator
Sideband Spurs
Option 001 or
Option 002
These spurs are mixing spurs that are generated by
the baseband generator at offsets up to 2.5 MHz. A
modulation format must be running to generate
these spurs.
The most likely cause is the
A7 Baseband Generator (Option 001 or Option 002).
Baseband Generator
Bit Clock Spurs
Option 001 or
Option 002
These spurs occur at the symbol rate of a digital
modulation format. A modulation format must be
running to generate these spurs.
The most likely cause is the
A7 Baseband Generator (Option 001 or Option 002).
Table 1-41