Specifications
ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
-
04)
43
5.3.5.2 Test method
5.3.5.2.1 Conducted measurements
The Hopping Frequency Separation as defined in clause 4.3.1.4 shall be measured and recorded using any of the
following options. The selected option shall be stated in the test report.
5.3.5.2.1.1 Option 1
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
Step 2:
• Allow the trace to stabilize.
• Use the marker function of the analyser to define the lower- and the upper -20 dBr points for both hopping
frequencies F1 and F2. This will result in F1
L
and F1
H
for hopping frequency F1 and in F2
L
and F2
H
for
hopping frequency F2. These values shall be recorded in the report.
Step 3:
• Calculate the centre frequencies F1
C
and F2
C
for both hopping frequencies using the formulas below. These
values shall be recorded in the report.
2
11
1
HL
C
FF
F
+
=
2
22
2
HL
C
FF
F
+
=
• Calculate the -20 dBr channel bandwidth (BW
CHAN
) using the formula below. This value shall be recorded in
the report.
BW
CHAN
=
F1
H
-
F1
L
• Calculate the Hopping Frequency Separation (F
HS
) using the formula below. This value shall be recorded in
the report.
F
HS
=
F2
C
-
F1
C
• Compare the measured Hopping Frequency Separation with the limit defined in clause 4.3.1.4.2. In addition,
for non-Adaptive Frequency Hopping equipment, the Hopping Frequency Separation shall be equal to or
greater than the -20 dBr channel bandwidth or:
F
HS
BW
CHAN