08 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview

Single channel GPS source

A reduced single channel GPS signal can be generated for GPS receiver

C/N0 test. The signal can be output from either RF IN/OUT or RF OUTPUT

ONLY.

Signal frequency

1575.42 MHz

Signal level range

–70 to –125 dBm

Satellite ID

1 to 37

Chip rate

1.023 Mcps

Code support

C/A code

Signal level accuracy

< ± 1.0 dB for signal level from – 70 to –116 dBm

< ± 1.5 dB for signal level from –116 to –25 dBm

Transmitter and receiver measurement

specifications

The time until a measurement times-out and returns control to

the user can be set independently for each measurement. All

measurements return a measurement integrity result indicating

the accuracy and usefulness of each measurement’s results.

EGPRS 8PSK measurements are GSMSK-tolerant. Any GMSK

bursts are detected and discarded. Measurements continue when

the next 8PSK burst is detected. EGPRS GMSK measurements

are also 8PSK-tolerant.

Frequency coverage and amplitude range

Unless otherwise noted, all specifications apply to frequencies of

450 to 496 MHz, 700 to 960 MHz, and 1.7 to 1.99 GHz, signals

with peak input power at the test set’s RF IN/OUT not higher than

+37 dBm, and temperatures of 0 to +55 °C. Input signal transmit

power (defined as the average power over the useful part of the

burst) at the test set’s RF IN/OUT must be within ± 3 dB of the

test set’s expected power for warranted performance.

GMSK signal generation

Absolute output level accuracy with GMSK modulation on:

Specification

Ranges

< ± 1.10 dB

Single slot from –110 to –13 dBm

< ± 1.10 dB

1 multislot level between –110 and –13 dBm

< ± 1.50 dB

2 multislot levels ≤ 20 dB apart between –110

and –70 dBm

Peak phase error

< ± 4 degrees

rms phase error

< 1 degree

Frequency error

< ± 0.01 ppm plus timebase reference

Amplitude flatness

< ± 0.3 dB for single-slot GMSK signals

< ± 1.0 dB for multislot GMSK signals

Supplemental characteristics

Typical absolute output level accuracy with GMSK modulation on:

Specification

Ranges

< ± 0.55 dB

Single slot from –110 to –13 dBm

< ± 0.55 dB

1 multislot level between –110 and –13 dBm

< ± 0.85 dB

2 multislot levels ≤ 20 dB apart between –110

and –70 dBm

Typical burst modulation

on/off ratio (referenced

to lowest signal level)

> 50 dB

8PSK signal generation

Absolute output level accuracy with 8PSK modulation on:

Specification

Ranges

< ± 1.10 dB

Single slot from –110 to –13 dBm

< ± 1.10 dB

1 multislot level between –110 and –13 dBm

< ± 1.50 dB

2 multislot levels ≤ 20 dB apart between –110

and –70 dBm

rms EVM

< 4%

Origin offset

suppression

> 35 dB

Frequency error

< ± 0.02 ppm plus timebase reference

Supplemental characteristics

Typical absolute output level accuracy with 8PSK modulation on:

Specification

Ranges

< ± 0.57 dB

Single slot from –110 to –13 dBm

< ± 0.57 dB

1 multislot level between –110 and –13 dBm

< ± 0.85 dB

2 multislot levels ≤ 20 dB apart between –110

and –70 dBm

Spectral purity

Harmonics

≤ –25 dBc for levels ≤ –17 dBm

Subharmonics

≤ –40 dBc

Non-harmonics

< –55 dBc for 100 to ≤ 1500 kHz offsets from

carrier, < –68 dBc for > 1500 kHz offsets from

carrier

Supplemental characteristics

Typical non-harmonic

performance

< –55 dBc for 3 to < 100 kHz offsets

< –53 dBc for line-related non-harmonics

Typical spurious due to

receiver LO leakage

< –50 dBm for spurious at 105 ± 2.5 MHz below

expected transmitter frequency and its second

harmonic

RF analyzer functionality

RF frequency

Ranges applied to

demodulation and

transmitter

specifications

450 to 496 MHz, 700 to 800 MHz, 810 to

960 MHz, and 1.7 to 1.99 GHz

Supplemental characteristics

Operating range

292.5 to 2700 MHz