T comprehensive audio generators are provided as standard for
wo
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.
SPECIFICATION
RF SIGNAL GENERATOR
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
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.
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
For the very latest specifications visit
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AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
