Agilent Technologies E8285A manual FM Deviation Call Control

Models: E8285A

1 464
Download 464 pages 57.8 Kb
Page 262
Image 262

Chapter 4, Description of Fields

Fields

FM Deviation

This is the default measurement for this field. The FM Deviation field displays the frequency deviation between the FM signal and the carrier. The FM Deviation measurement field is only displayed when the AF Anl In field is set to FM Demod or FM Mod.

See Also

Atten Hold field description, on page 169

AF Anl In field description, on page 155

Screens Where Field is Present

DUPLEX TEST

ANALOG MEAS

AF ANALYZER

RF ANALYZER

RF GENERATOR

TX TEST

FM Deviation (Call Control)

This field displays the measured FM deviation of the carrier being transmitted by the mobile station. Four dashes (----) indicate that no carrier is present to measure.

See “Measure” in the GPIB Command Syntax chapter of the E8285A Condensed Programming Reference Guide for programming command syntax.

A numeric value would only be displayed in the connected state (that is, the Connected annunciator is lit). The FM Deviation field is only displayed when the Display field is set to Meas.

Refer to the "Display" field on page 223 for information on how to read measurement results from this field.

When the CALL CONTROL screen is displayed, the Test Set’s instrumentation is configured for optimal performance of the signaling decoder. Two characteristics of the instrumentation which have a significant affect on the performance of the signaling decoder are: 1) audio frequency gain and 2) post detection filtering.

While the CALL CONTROL screen is displayed the audio frequency gain stages are fixed (that is, autoranging is tuned off). This is necessary to ensure that no signaling bursts are missed as a result of the audio gain stages autoranging in response to a burst of signaling data. Fixing the audio gain stages may result in a slight accuracy degradation for FM deviation measurements less than 7 kHz.

262

S:\agilent\e8285\REFGUIDE\MANUAL\fields.chp

Page 262
Image 262
Agilent Technologies E8285A manual FM Deviation Call Control