Specifications

ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
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0
4)
44
• See figure 4:
Figure 4: Hopping Frequency Separation
For adaptive systems, in case of overlapping channels which will prevent the definition of the -20 dBr reference points
F1
H
and F2
L
, a higher reference level (e.g. -10 dBr or - 6 dBr) may be chosen to define the reference points F1
L
; F1
H
;
F2
L
and F2
H
.
Alternatively, special test software may be used to:
• force the UUT to hop or transmit on a single Hopping Frequency by which the -20 dBr reference points can be
measured separately for the 2 adjacent Hopping Frequencies; and/or
• force the UUT to operate without modulation by which the centre frequencies F1
C
and F2
C
can be measured
directly.
The method used to measure the Hopping Frequency Separation shall be documented in the test report.
5.3.5.2.1.2 Option 2
The test procedure shall be as follows:
Step 1:
• The output of the transmitter shall be connected to a spectrum analyzer or equivalent.
• The analyzer shall be set as follows:
- Centre Frequency: Centre of the two adjacent hopping frequencies
- Frequency Span: Sufficient to see the complete power envelope of both hopping frequencies
- RBW: 1 % of the Span
- VBW: 3 × RBW
- Detector Mode: RMS
- Trace Mode: Max Hold
- Sweep Time: Auto