ADJUSTMENT PROCEDURES

Section V

TM 11-6625-2781-14&P-2

ADJUSTMENT PROCEDURES

5-22. First Local Oscillator Adjustment

DESCRIPTION:

After the display and IF sections are adjusted, the first local oscillator is adjusted on the 0-110 MHz range. Adjustments

are first made at the end points of the frequency dial and then the midpoints are adjusted in 10 MHz increments. The 0-

11 MHz range is selected and the frequency is adjusted at the 0 and 11 MHz points.

Figure 5-1. First Local Oscillator Adjustment Test Setup

EQUIPMENT:

Comb Generator ................................ ................................ ................................ ................................ ....... HP 8406A

Frequency Counter with 5252A Plug-in ................................ ................................ ................................ ...... HP 5245L

BNC Cable Assembly................................ ................................ ................................ .............................. HP 10503A

Type N male-to-BNC female Adapter ................................ ................................ ................................ ...... UG-201A/U

Extender Cable Assembly ................................ ................................ ................................ ............... HP 11592-60015

Interconnection Cable Assembly ................................ ................................ ................................ ..... HP 11592-60016

Cable Assembly ................................ ................................ ................................ .............................. HP 11592-60013

1. Connect the setup in Figure 5-1. Make the following control settings:

ANALYZER:

RANGE MHz ................................ ................................ ................................ ................................ ................... 0-110

FREQUENCY ................................ ................................ ................................ ................................ ................. 0 MHz

FINE TUNE................................ ................................ ................................ ................................ ................. Centered

BANDWIDTH ................................ ................................ ................................ ................................ ................. 30 kHz

SCAN WIDTH ................................ ................................ ................................ ................................ ....PER DIVISION

SCAN WIDTH PER DIVISION ................................ ................................ ................................ ........................ 1 MHz

INPUT ATTENUATION................................ ................................ ................................ ................................ .... 10 dB

5-5