6. Sampling Oscillator Adjustment

6. Sampling Oscillator Adjustment

Assembly Adjusted

Al5 RF Assembly

Related Performance Test

There is no related performance test for this adjustment procedure.

Description

The phase detector bias is adjusted for 1.8 Vdc. The sampling oscillator tank circuit is adjusted for a tuning voltage of 0.9 Vdc when the oscillator is set to 288 MHz. The voltage monitored is actually the tuning voltage divided by 4.05. A coarse-tune procedure is also included, but should only be necessary when the coaxial resonator is replaced. The power and match of the sampling oscillator signal to the A15A2 Sampler are also adjusted.

 

SPECTRUM ANALYZER

D I G I T A L V O L T M E T E R

w PC

BOARD

 

 

P R O P

S K 1 7

Figure 2-8. Sampler Adjustment Setup

Equipment

An asterisk (*) indicates equipment used only for the coarse-tune procedure.

Digital Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

DVM Test Leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 34118A

Frequency Counter* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5343A

Active Probe* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 1121A

Power Supply* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 6114A 1 MR Resistor* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0757-0080

Adapters

Type BNC (f) to BNC (f)’ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0059

Cables

BNC,122cm(48in)* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Adjustment Procedures 2-33