ACCEPTANCE TESTING
6-37
Burst control
Specification
On/off ratio:
Greater than 70 dB
Test equipment
Description Minimum
specification Example
Spectrum analyzer
80 dB dynamic range at 100 MHz
Aeroflex 2383
Break-out box
Aeroflex 44991-144
(1) Connect the test equipment as shown in Fig. 6-24.
Fig. 6-24 Burst control test set-up
(2) Set the UUT to 100 MHz in Digital Modulation Mode generating QPSK from external
parallel data as follows:
[Carrier Freq.] 100 MHz [RF Level]
0 dBm [UTIL]
[Mod'n Mode][Digital]
[SIG GEN]
[Mod'n System][Select Mod. Type][PSK][QPSK(4PSK)]
[SIG GEN]
[Data/Timing][External Parallel]
(3) Set the spectrum analyzer as follows:-
Reference frequency
100 MHz
Reference level
0 dBm
Span/div
1
kHz
Peak find
MKR 1 Sets Ref Level
2nd funct dB
(4) Apply a short circuit to the BURST BIT I/P socket on the break-out box. The marker reading
must be better than -70 dB.
Advanced digital mode
Adjacent channel performance
This parameter can only be verified by using a measurement technique dependant on the use of
specialist test equipment and complex data processing software. It is therefore recommended that
if calibration (with national traceability) of the adjacent channel performance is required, the unit
is returned to the UK Service Division.