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Two comprehensive audio generators are provided as standard for

internal modulation or audio sources for transmitter stimulus.

External DC coupled FM is provided.

Comprehensive Oscilloscope

Analysis of audio signals, whether from the demodulated signal or the

audio input direct can be viewed for further inspection. The oscillo-

scope can either be combined with the measurement screen in the

Tx, Rx or AF test modes or ‘zoomed’ to a full screen display.

Different levels of persistence can be selected to allow short or long

term effects to be captured.

Transient Analysis

The ability to capture transients on the rising or falling edge of a

waveform provides a valuable tool for fault finding radios and radio

systems. The user has full control of the trigger level and input atten-

uation as well as the timebase and five fixed trigger points, making

this feature simple and flexible to operate.

Harmonic Analysis

An automatic harmonic analysis function is included in the 2948.

This complements the fast spectrum analyzer and allows a rapid

check that the transmitter under test is not producing any excessive

harmonics.

Tones Generation and Decoding

The tones menus include full remote control so that radio workshops

can further automate their tasks and better control the tones from the

top level screens.

POCSAG Decode - built in option

Off-air decoding of POCSAG signals is provided as an option.

This allows tone, numeric and alphanumeric messages to be dis-

played. Signals with bit rates of up to 4800 bits/s can be automatical-

ly decoded making the 2948 an ideal surveillance tool. The 2948 can

be set to detect all messages, a user selectable RIC (just like a pager),

or a fixed message string.

S

SP

PE

EC

CIIF

FIIC

CA

AT

TIIO

ON

N

R

RF

F S

SIIG

GN

NA

AL

L G

GE

EN

NE

ER

RA

AT

TO

OR

R

FREQUENCY

Frequency Range

400 kHz to 1.05 GHz

Resolution

10 Hz

Indication

10 digit display

Setting

Keyboard entry, delta increment/decrement function and rotary control

Accuracy

As frequency standard

OUTPUT LEVEL

Output Level Range

Rx Test:

N-Type socket: -141 dBm to -21 dBm

BNC socket: -115 dBm to +5 dBm (overrange to +7 dBm)

Resolution

0.1 dB

Indication

4 digits plus sign (dBm, dBµV, µV, mV PD/EMF).

Accuracy

±2 dB for level above -127 dBm on N-Type socket up to 1 GHz

Reverse Power Protection

N-Type: 50 W 10 minutes, normal operation. 150 W for 1 minute at

20 °C.

Overload indicated by audible and visual warning.

BNC: 5 W Overload indicated by audible and visual warning.

Output Impedance

Nominally 50

Ω

VSWR

N-Type

Better than 1.2:1 up to 500 MHz

Better than 1.35:1 up to 1.05 GHz

BNC

Better than 2.2:1 up to 1.05 GHz

2948iss15.qxd

01/Dec/2004

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