Rohde & Schwarz 890 Series - A3.3.5

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 Basic Settings
A3.3.5 Quasi>continuous Bandwidth (R&S EK 896 and
R&S EK 895 with Option R&S EK 895S7)
Command syntax:
Code: Q
Parameter: .................... a, b
Possible entries / replies
a>parameter: bandwidth
Range: .......................... 100 to 9000 Hz
Stepdwidth: ................. 1
Entry: ....................... in Hz
b>parameter:
0 = select bandwidth from choice of fixed
bandwidths
1 = set bandwidth quasi>continuously
Note:
With the function of quasi>continuous band>
width selection, the maximum available band>
width range (100 Hz to 9 kHz) is subdivided
into 128 single bandwidths. Neighbouring
bandwidths differ from each other by approx.
3 %. In the IF / AF processor 17 fixed band>
widths are programmed (150 Hz, 300 Hz,
400!Hz, 600 Hz, 800 Hz, 1000 Hz, 1500 Hz,
1800!Hz, 2100 Hz, 2400 Hz, 2700 Hz, 3100 Hz,
3600 Hz, 4000 Hz, 4800 Hz, 6000 Hz, 8000 Hz).
If the entered value is neither a fixed band>
width (b = 0) nor a single bandwidth (b = 1),
the next higher value will be used. Depending
on the set modulation mode, only particular
bandwidths within a defined range (see table)
can be activated.
Example 1:
Activating the IF filter with the fixed frequency
3100!Hz
Command = rAxxQ3100,0?
Example 2:
Inquiry of the currently effective IF bandwidth
Command = rAxxQ??
Æ Reply = rAxxQ3100,0?
The IF filter with the fixed bandwidth 3100 Hz
is currently active.
Example 3:
Activating the IF filter with the quasi>
continuous bandwidth 700!Hz with request for
acknowledgement
Command = rAxxQ700,1,??
Æ Reply = rAxxQ711,1?
Since the entered value (700 Hz) is no single
bandwidth, the next higher value (711 Hz) is
used.
AM CW
USB
LSB
FSK AFSK F7B FAX1 FAX2 FM
ISBUSB
ISBLSB
Fixed / kHz
Min. bandwidth / kHz 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 2.1
Max. bandwidth / kHz 8.0 8.0 3.6 8.0 8.0 8.0 8.0 8.0 8.0 3.1
Quasi>continuos
Min. bandwidth / kHz 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1.836
Max. bandwidth / kHz 9.0 9.0 3.674 9.0 9.0 9.0 9.0 9.0 9.0 3.375
6164.0717.02_01
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