Programming Considerations - Motorola R-2001A Service Manual

22-46. 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.
22-47. Generate Mode. For accurate level control it is best to specify the generate frequency priortotheRF
output level. For example, the command string:
sets the generate mode, a frequency of 100 MHz and an output level of +5 dBm.
22-48. 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 22-7 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.
Output
DPL Code
DPL Inverted Code
PL Code
Tone A
Tone B
Tone Remote
A/B Standard Sequence
A/B User Sequence
22-49. 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;
selects the FM mode, disables the 1 kHz and code synthesizer modulation, and set 20 kHz deviation from the
external input. The external input must be applied to the analyzer prior to sending this command.
22-50. 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 at 100 Mz with a
level of-100 dBm:
22-51. The bandwidth control commands, RN and RW, range the generate FM modulator sensitivity. For
greater resolution and faster set up time for deviations less than 20 kHz use the narrowband 'RN' command.
Above 20 kHz deviation the wideband 'RW command must be used.
Table 22-7. Code Synthesizer Programming Considerations
Command String
CFOAD131MMOMS3
CFAD313MM1MS5
CF2AP60.5MMMS30
CFAA2E3MM2MS3
CFAB2000MM3MS3
CFAA1.5E3AB300MM5MS3
CFAS4AA1 E3AB2E3MM4MS3
CFAS5AA1 E3AB2E3AW1
AX1AY1AZ1MM4MS3
CGGF100GL-100MEMSMK30
CGGFIOOGL5
FM, DPL Code 131, 3 kHz FM
FM, DPL Code 313, 5 kHz FM
AM, PL-60.5 Hz, 30% AM
FM, 2000 Hz, 3 kHz FM
FM, 2000 Hz, 3 kHz FM
FM, A = 1500 Hz, B = 300 Hz, 3 kHz FM
FM, Sequence 4, A = 1 kHz, B = 2 kHz, 3 kHz FM
FM, Sequence 5, A = 1 kHz, B = 2 kHz
1 sec on/off times, 3 kHz FM
CFMKMSME20
22-11
Effect