Specifications

308 Chapter 10

Block Diagrams

RF Generator Section

Frequency Generation

The A2A25 Signal Generator Synthesizer (Figure 10-17 on page 310)

develops a 500 MHz to 1000 MHz signal which is phase-locked to the

200 kHz reference from the A2A23 Reference Assembly (Figure 10-21

on page 315). An out-of-lock indicator LED lights if the phase-lock-loop

is out-of-lock. When you turn the Test Set’s power on, the LED lights for

a few seconds then goes out. If it stays on or comes on again, the loop is

out-of-lock.

The A2A44 Output Section assembly (Figure 10-19 on page 312)

develops the RF Generator’s 0.4 to 000 MHz frequency range by mixing,

dividing, or passing the 500 MHz to 1000 MHz from the Signal

Generator Synthesizer. The frequencies are derived as shown in Table

10-2.

The A2A110 Upconverter assembly (Figure 10-20 on page 313) develops

the RF generator’s 1.2 to 2.0 GHz range by mixing the 800-1000 MHz

signal from the output section with a 1.5-3.0 GHz LO.

Table 10-2 IF Frequencies

Output Frequency Derivation

400 kHz - 250 MHz mix

250 MHz - 500 MHz divide

500 MHz - 1 GHz pass

1.7 GHz - 2.0 GHz mix