Internal AM Frequency Response

AM frequency responsedescribes the variation of the actual AM modulation depth vs. modulation rate at a given CW frequency. In this test, the AM rate is varied from DC to 10 kHz and the DUT CW frequency is varied from 501 kHz to 2.0 GHz.

AM depth is set to 30% or 60% at a reference AM rate of 1 kHz. The actual depth is measured with a measuring receiver and stored as the reference depth. While the depth setting on the ESG remains constant, the actual depth is measured for AM rates between DC and 10 kHz.

Required Test Equipment

Instrument	Critical Specifications for This Test	Recommended Model¹
Measuring Receiver	AM Depth Accuracy	8902A
Mixer2	RF/LO Freq. Range: 1 to 2800 MHz IF Frequency Range: 1.5 MHz RF 1 dB compression: +8 dBm RF/LO Freq. Range: 500 to 9000 MHz IF Frequency Range: 50 MHz	M/A-COM MDC-164
Local Oscillator2	Frequency Range: 500 to 3000 MHz Amplitude:16 dBm	E8267D

Instrument

Critical Specifications for This Test

Recommended Model¹

Measuring Receiver

AM Depth Accuracy

8902A

Mixer2

RF/LO Freq. Range: 1 to 2800 MHz
IF Frequency Range: 1.5 MHz
RF 1 dB compression: +8 dBm
RF/LO Freq. Range: 500 to 9000 MHz
IF Frequency Range: 50 MHz

M/A-COM MDC-164

Local Oscillator2

Frequency Range: 500 to 3000 MHz

Amplitude:16 dBm

E8267D

Refer to the main equipment list for alternate models.
Not used for ESGs with frequency range < 2 GHz.

Connections and Setup Procedures

All test equipment requires a 30 minute warm-up period to ensure accurate performance.
In the following test setup, direct cable and adapter connections are designated as solid lines. Changeable cable and adapter connections are designated as dashed lines.
Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this test, follow all instructions on the controller display.

Measuring Receiver Calibration Setup

AM Freq Response CW Frequency <= 1300 MHz Test Setup

AM Freq Response CW Frequency > 1300 MHz Test Setup