1389 Hz - HP 8642A Operation And Calibration Manual

Operation
Modulation, FM (cont'd)
2l60Y'
lOBOY
540Y
MAXIMUM FM
270V
DEVIATION
(Hz INT:
135Y
Hz
per volt
EXTI
67.5V
Y-ModulaUon
Frequency
33 75Y
16 875V
8.4375Y
0.1
10M
9
8
7
OrVlOE
BANDS
16 33 66 132 264 528 1057 2115>
RF FREQUENCY (MHz)
Actual band boundaries are listed in Table 3-11
(*86428 ONl Vi
Figure 3-12. FM Deviation Limitations for each
RF
Frequency Band;
Modulation Frequencies <1389 Hz
Model 8642A/B
(Internal, external ac-coupled, or the internal and the external ac-coupled FM source summed together)
~ote:
The Y in each of the Y-axis values represents the desired modulation frequency value (in Hz).
Multiply the numeric value in the Y -axis times the desired modulation frequency value to determine the
deviation limits. For example, to determine the maximum possible value of FM deviation for an RF
frequency of 500 MHz (the X-axis value) and a desired modulation frequency of 1000 Hz, multiply 540
times 1000. This calculation results in 540 kHz which is the maximum possible FM cieviation for these
settings.
MAXIMUM
3000>
1500
750
375
DEVIATION
187.5
(kHz
INT:
kHz
per 93.75
volt
EXT)
46.875
23.4375
11 71875
9
7
DIVIDE
BANDS
o
1 4
8 16 33 66 132 264 528 1057 2115*
RF FREQUENCY (MHz)
Actual band boundaries are listed in Table 3-11
(*8642B ONl
YI
Figure
3-13.
FM Deviation Limitations for eac11 RF Frequency Band;
Modula tion Frequencies
2:
1389 Hz
(Internal, external dc-coupled, or the internal and an external dc-coupled PM source summed together.)
You can determine wheter the Signal Generator will select a divide band or the heterodyne bam! Assume
an RF frequency of 100 MHz .. If you select a deviation of 90 kHz, the Signal Generator will use divide band
6 since the maximum possible deviation for band 6 is 187.5 kHz (unless Special Function 8, Prefer
Heterodyne Band, is selected). If you select 700 kHz deviation, the Signal Generator will automatically
select the heterodyne band. (Note that maximum possible deviation for the heterodyne band is 1500 kHz)
3-106