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Annex-A-3
Test procedure
(1) Press CAL on the spectrum analyzer.
(2) Connect the test equipment as shown in Fig. A-2.
(3) On the UUT set:
Carr Freq 100 kHz
RF Level 0 dB
Pulse ON
(4) Set the function generator to provide +5 V DC. The RF output will now be enabled.
(5) Tune the spectrum analyzer to the same frequency as the signal generator.
(6) Press PEAK FIND on the spectrum analyzer and note the output level.
(7) Apply a short circuit to the PULSE INPUT socket.
(8) Again note the output level measured by the spectrum analyzer.
(9) The difference between the levels recorded in (6) and (8) is the pulse mod on/off ratio.
Check that the ratio is within specification using Table A-4.
(10) Repeat (5) to (9) for each of the frequencies shown in Table A-4.
Pulse modulation rise and fall time
C2567
OUTPUT
Function generator
RF
OUT
UUT
PULSE
INPUT
Oscilloscope
Fig. A-3 Pulse modulation rise and fall time test set-up
Test procedure
(1) Connect the test equipment as shown in Fig. A-3.
(2) On the UUT set:
Carr Freq 1 GHz
RF Level +7 dB
Pulse ON
(3) Set the function generator to produce 100 kHz, 0 V to +5 V square wave.
(4) Adjust the oscilloscope controls such that the rise time of the envelope can be measured.
(5) Measure the rise time between the 10% to 90% points checking that it is within the
specification shown in Table A-5.
(6) Repeat (4) to (5) for the fall time of the envelope.