HP 8568B 14.249 MHz Phase Lock Oscillator Adjustments, Cables:, Adapters:, RF Section:, Type N (m) to BNC (f), A7 249 MHz Phase Lock Oscillator

14.249 MHz Phase Lock Oscillator Adjustments

Reference

Description

14. 249 MHz Phase Lock Oscillator Adjustments

RF Section:

A7 249 MHz Phase Lock Oscillator

Two center frequencies are chosen: one which will tune the 249 MHz Oscillator to its low-end frequency and one which will tune the 249 MHz Oscillator to the high-end frequency. The voltage is monitored with a DVM at the output of the oscillator, and the oscillator frequency is adjusted to produce the proper dc voltage output for each frequency (low-end and high-end). Next, the 500 kHz Trap is adjusted to null the 500 kHz sidebands using the sixth harmonic of the 249 MHz signal.

DIGITAL VOLTMETER	SPECTRUM ANALYZER
	1

SPECTRLM ANALYZER

J

Figure 3-59. 249 MHz Phase Lock Oscillator Adjustments Setup

Equipment Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . HP 8566A/B Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8447F Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A Tee, SMB Male . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 1250-0670

Adapters:

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1250

Cables:

BNC cable, 122 cm (48 in) (2 required) . . . . . . . . . . . . 10503ABNC to SMB Snap-On cable (2 required) . . . . . . 85680-60093

Adjustments 3-107