Programming Considerations - Motorola R-20018 Manual

21-46. Programming Considerations. The flexibility of the IEEE-488 option is reflected In the number of
programming commands. To use these effectively and efficiently, certain programming practices should be
followed. The following paragraphs present the major considerations for effective programming.
21-47. Generate Mode. For accurate level control it is best to specify the generate frequency prior to the RF
output level. For example, the command string:
CGGFIOOGL5
sets the generate mode, a frequency of 100 MHz and an output level of +5 dBm.
21-48. Code Synthesizer. Before enabling the output of the code synthesizer with an MS, ME, or MK
command, all the necessary parameters must first be defined. Table 21-7 lists the modes and their controlled
parameters that need to be defined. It should be noted that these parameters do not need to be defined each
time a mode is selected, only when they are to be changed for that mode.
Table 21-7. Code Synthesizer Programming Considerations
Output Command String
Effect
DPL Code CFOAD131 MMOMS3 FM, DPL Code 131, 3kHz FM
DPL Inverted Code CFAD313MM1MS5 FM, DPL Code 313, 5kHz FM
PL Code CF2AP60.5MMMS30 AM, PL-60.5 Hz, 30% AM
Tone A CFAA2E3MM2MS3 FM, 2000 Hz, 3 kHz FM
Tone B CFAB2000MM3MS3 FM, 2000 Hz, 3 kHz FM
Tone Remote
CFAA 1.5E3AB300MM5MS3
FM, A= 1500 Hz, B = 300 Hz, 3 kHz FM
A/B Standard Sequence CFAS4AA 1 E3AB2E3MM4MS3 FM, Sequence 4, A= 1 kHz, B =2kHz, 3kHz FM
A/BUserSequence
CFAS5AA 1 E3AB2E3AW1
FM, Sequence 5, A = 1 kHz, B = 2 kHz
AX1AY1AZ1MM4MS3 1 sec on/off times, 3 kHz FM
21-49. Modulation. The system analyzer is capable of modulating with three simultaneous sources. The
commands ME, MK, and MS only affect their individual portion of the total output. Thus to avoid inadvertently
having an unwanted modulation source enabled it is recommended that all three source values be defined
together. For example;
CFMKMSME20
selects the FM mode, disables the 1 kHz and code synthesizer modulation, and set 20kHz deviation from the
external input. The external input must be applied to the analyzer prior to sending this command.
21-50. For the generate AM mode the frequency and output level must be defined prior to selecting the
modulation level. The following command string Is of the proper sequence to obtain 30% AM at100 Mz with a
level of -100 dBm:
CGGF100GL-100MEMSMK30
21-51. The bandwidth control commands, AN and RW, range the generate FM modulator sensitivity. For
greater resolution and faster set up time for deviations less than 20kHz use the narrowband 'AN' command.
Above 20 kHz deviation the wideband 'RW' command must be used.
21-11