Rohde & Schwarz 890 Series - Automatic Gain Control; Preparations; Required Test Equipment; Sensitivity

V L F > H F R E C E I V E R S f R & S E K 8 9 5 / R & S E K 8 9 6
User Manual f Simple Measurements
4.2.5 Simple Measurements
4.2.5.1 Required Test Equipment
f Audio Analyzer R&S UPA 372.6014.02
f Distortion Meter R&S UPA>B8 373.1616.02
f Signal Generator R&S SMX 826.4517.02
4.2.5.2 Preparations
1. Switch off the VLF>HF receiver.
2. Disconnect RF cable from antenna socket.
3. Disconnect AF line from female connector
strip OUTPUT.
4. Connect signal generator to antenna
socket.
5. Connect audio analyzer to contacts X66.1
(AFa) and X66.2 (AFb).
6. Switch on VLF>HF receiver, signal generator
and audio analyzer.
4.2.5.3 Sensitivity
1. Make preparations acc. to 4.2.5.2.
2. On VLF>HF receiver set modulation mode
USB.
3. On signal generator set a level of 1!mV
EMF
.
4. On signal generator vary the frequency in
the range between 1.5 and 30 MHz. At the
same time set the VLF>HF receiver to the
relevant signal generator frequency.
5. By means of audio analyzer measure the
sensitivity.
Nominal value: f 10 dB (SINAD)
6. Carry out the steps of 4.2.5.2 in the reverse
order.
4.2.5.4 Automatic Gain Control
1. Make preparations acc. to 4.2.5.2.
2. On VLF>HF receiver set modulation mode
USB and a frequency of 5.100!MHz.
3. On signal generator set a frequency of
5.101 MHz and a level of 1!V
EMF
.
4. By means of audio analyzer measure AF
level (= value 1).
5. On signal generator reduce the level to
1!mV
EMF
.
6. By means of audio analyzer measure AF
level (= value 2).
Nominal value: difference between
value 1 and 2 < 3 dB
7. Carry out the steps of 4.2.5.2 in the reverse
order.
4.2.5.5 Signal>to>Noise Ratio
1. Make preparations acc. to 4.2.5.2.
2. On VLF>HF receiver set modulation mode
USB, a bandwidth of 2700 Hz and a
frequency of 5.100!MHz.
3. On signal generator set a frequency of
5.101 MHz and a level of 1!V
EMF
.
4. By means of audio analyzer measure
signal>to>noise ratio.
Nominal value: > 46 dB (SINAD)
5. On VLF>HF receiver set modulation mode
LSB.
6. On signal generator set a frequency of
5.099 MHz.
7. By means of audio analyzer measure
signal>to>noise ratio.
Nominal value: > 46 dB (SINAD)
6. Carry out the steps of 4.2.5.2 in the reverse
order.
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