Agilent Technologies 8753ES Option 011 Service Manual page 372

Theory of Operation
Source Low Band Operation
Figure 12-4 Low Band Operation of the Source
The full low band is produced in two sub sweeps, to allow addition IF filtering below
3 MHz. At the transition between subsweeps, the source is pretuned and then relocks.
Table 12-2 lists the low band subsweep frequencies at the fractional-N VCO and the RF
output.
Table 12-2 Low Band Subsweep Frequencies
Fractional-N (MHz)
40.3 to 43.3
43.3 to 56.0
12-18
1st IF (MHz) Source Output
0.3 to 3.3
3.3 to 16.0 3.3 to 16.0
(MHz)
0.3 to 3.3
Chapter 12