Scheduled Maintenance R&S SU 4200
5.1 6125.0226.12.01
5 Maintenance
This chapter
This chapter provides information concerning scheduled maintenance and
cleaning.
Further
information
Chapter
3.1 contains an overview of transmitter control elements,
indicators, etc.
Chapter
3 describes how to put the radio into operation.
5.1 Scheduled Maintenance
Scheduled mai ntenance\Sc heduled mai ntenance "Radio ".doc
5.1.1 TCXO Adjustment (VAR.02)
Inspecting
the air intake
Inspect the air intake on the front panel for dust build-up and clean it if
necessary. The inspection interval depends on the environmental conditions
under which the transmitter is operated.
Note: Due to the long service life of the fan, no regular maintenance is
required here besides cleaning. The speed of the fan is monitored by
means of the continuous built-in test (CBIT), and a warning is promptly
generated (see chapter
4.2).
TCXO adjustment
Due to the natural aging of the crystal oscillator (TCXO), it is advisable to
check the frequency offset after the first year of operation and readjust it if
necessary. We recommend a further adjustment interval of 3 years in order
to ensure the specified frequency accuracy.
This chapter
Test connection
Fig. 5.1 Test connection of TCXO adjustment
Test procedure
DUT is controlled via the R&S ZS 4200 (see chapter
3.3).
The minimum warm-up time is 1 minute for the TCXO.
Test frequency: 120 MHz (see chapter
3.4.7.2)
Power level set: Low (see chapter
3.4.7.2)
Mode: AM (see chapter
3.4.7.2)
Radio is keyed ON, e.g. via function Test PTT, which delivers an
unmodulated SW signal (see chapter
3.4.7.4.1).
Measure frequency at antenna X3 and adjust TCXO value using
the R&S ZS 4200 (see chapter
3.3).
D.U.T.
X3
ATT
30 dB
Spectrum
analyzer/
frequency
counter
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