Section II. Equipment Description

TM 11-6625-3059-10

Section II. Equipment Description

DESCRIPTION

FM/AM Modulation Meter M E-525AIUSM provides automatic (AUTO) tuning, leveling, and modulation display of AM

and FM signals. Manual tuning and leveling is also possible using an external (EXT) signal using front panel controls and

controls of the external signal source.

Automatic and Manual Operation. The highest amplitude radio frequency(rf) carrier in the frequency range of 10

megahertz (MHz) to 1.2 gigahertz (GHz) is automatically tuned (or manually acquired by adjustment of equipment

used for external input) and normalized in level to produce a 1.0 MHz intermediate frequency (if.) signal identical to

the input rf carrier (AM or FM modulated). The modulating signal is detected, filtered, measured and then displayed

on the digital display in percent of AM modulation or kilohertz of FM deviation.

Detectors. Pushbutton switches select displays of positive or negative peak modulation or peak average, each in

three ranges for FM and AM.

Audio Filters. Four high and four low pass filters and four de-emphasis networks provide the means for bandpass

simulation of most communications systems. The 6 decibel per octave (6 dB/OCT) pushbutton de-emphasis switch

relates phase deviation to the frequency deviation displayed.

EQUIPMENT DATA

Weight and Dimensions

Weight

14 lbs. (63.5 kg)

Length

15.72 in. (399.3 mm)

Width

13.68 in. (347.5 mm)

Height

6.36 in. (111.5 mm)

Data Plate

1-2