1
Download 8753D Option 011 Network Analyzer Service Guide
Transcript
6. When lock is achieved at the start frequency, the synthesizer starts to sweep. This changes the phase lock reference frequency, and causes the source to track at a dierence frequency 40 MHz below the synthesizer. A synthesized sub sweep is generated. The source tracks the synthesizer. Figure LBBLK12 here. Figure 12-4. Low Band Operation of the Source The full low band is produced in two sub sweeps, to allow addition IF ltering 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) 1st IF (MHz) RF Output (MHz) 40.3 to 43.3 0.3 to 3.3 0.3 to 3.3 43.3 to 56.0 3.3 to 16.0 3.3 to 16.0 12-12 Theory of Operation DRAFT 3/21/106 15:14
