HP 8642B Operation And Calibration Manual

Operation Model 8642A/B
RF Frequency (cont'd)
Procedure
FREQ
The divide bands and the Bet band have the following advantages:
Divide Bands:
Het JiJand:
~ Lower phase noise
e Higher output level
specifications
o Greater stereo separation with
dc-coupled FM
6 Wider FM/q,M deviation at frequencies
less than 132.187501 MHz
@ Greater AM rates in the range from 4.130860
to 33.046875 MHz
t) Wider frequency spans in Phase Continuous
Frequency Sweep (Special Function 123).
Refer to Table 1-1, Specifications (which starts on page 1-7), for the specific
differences between the Het band and the divide bands.
The divide bands are normally selectecl since they have the lowest possible phase noise.
However,
the Signal Generator will automatically switch to or from the Het band if a
setting crosses either a divide band's maximum FM or q,M deviation limits or a divide
band's
frequency span limits in Phase Continuous Frequency Sweep. In other words, if
your settings are not possible in a divide band but are possible in the Het band (at the
identical RF frequency), the Signal Generator will sometimes automatically switch to
the Het band to allow your settings. However, selecting Special Function 8, Prefer
Heterodyne Band, forces the Signal Generator to always operate in the Het band
whenever RF frequency is less than 132.187501 MHz (regardless of FM or q,M
deviation or Phase Continuous Frequency Sweep span limits). This special function
prevents the Signal Generator from switching to the divide bands from the Het band
when the settings would allow operation in the divide bands.
Refer to Figures 3-12 and 3-13 (page 3-106) for the FM deviation limits in each
frequency band. Refer to Modulation, <PM (page 3-119) for the q,M deviation limits in
each frequency band. Refer to RF Frequency Sweep (page 3-49 and 3-60) for
information about frequency span limitations in Phase Continuous Frequency Sweep.
?·.,rote: Put the instrument in its initialized state by selecting ( INSTR PRESETJ.
How To Set RF Frequency
3-40
RF frequency is set by selecting the RF frequency function and then entering the
desired
frequency:
( FREQ ) and the value of the desired RF frequency (up to 10 digits) (in GHz, MHz,
kHz, or Hz).
Example
Set RF freql.:cncy to 1.23 MHz.
ENTRY
DATA
LOCAL
(keys)
8
OJDOJOJ ~
~
(program
FR 1.23 MZ
code~)

HP 8642B Specifications

General

Brand	HP
Model	8642B
Category	Inverter
Language	English