Rohde & Schwarz 890 Series - Modulation Mode

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
A3.3.3 Modulation Mode
Command syntax:
Code: I
Parameter: ................... a,b,c,d,e,f
Possible entries / replies
a>parameter: modulation mode
1 = AM 9 = FM
2 = USB 10 = F7B
3 = LSB 13 = ISBUSB
4 = FAX1 14 = ISBLSB
5 = CW 15 = L USB
6 = FSK 16 = L LSB
7 = AFSK 17 = L ISB USB
8 = FAX2 18 = L ISB LSB
b>parameter: TTY status
(for FSK, AFSK and F7B only)
0 = run
1 = stop
c>parameter: signal polarity
(for FSK, AFSK and F7B only)
FSK / AFSK F7B (channel 1 / channel 2)
0 = > 0 = > / >
1 = + 1 = + / >
2 = > / +
3 = + / +
d>parameter: frequency deviation
(for FSK, AFSK and F7B only)
1 = 42 Hz 7 = 62 Hz
2 = 85 Hz 8 = 125 Hz
4 = 225 Hz 9 = 250 Hz
5 = 425 Hz 10 = 500 Hz
e>parameter: baud rate
(for FSK, AFSK and F7B only)
1 = 50 Bd 5 = 300 Bd
2 = 75 Bd 6 = 600 Bd
4 = 150 Bd
f>parameter: frequency offset
(for FSK and AFSK only)
Range: ....................... >3000 to 3000
Stepwidth: ................. 1 Hz
Entry: ......................... in Hz
Note:
To each modulation mode an appropriate
bandwidth, BFO frequency and control type
and time are assigned.
Therefore, when the default setting (see
A3.7.19) is activated, altering the modulation
mode automatically changes the bandwidth,
BFO frequency and control type and time. If
this setting is not the required one, the receiver
settings concerned must be altered as desired.
The parameter order must not be altered.
However, the parameters may be entered se>
lectively, i.e., parameters which are not needed
can be omitted.
In modulation mode ISB, the operator can se>
lect the monitoring sideband (USB or LSB) as
desired.
Example 1:
Activating modulation mode USB
Command = rAxxI2?
Example 2:
Inquiry of the currently active modulation
mode
Command = rAxxI??
Æ Reply = rAxxI2?
The modulation mode USB is now active.
Example 3:
Set the receiver as follows:
f Modulation mode: FSK Æ a = 6
f Demodulation: run Æ b = 0
f Polarity: + Æ c = 1
f Frequency deviation: 225 Hz Æ d = 4
f Baud rate: 75 Bd Æ e = 2
Command = rAxxI6,0,1,4,2?
Example 4:
Selective entry of a baud rate of 300 Bd with
request for acknowledgement
Command = rAxxI,,,,5,??
Æ Reply = rAxxI6,0,1,4,5?
The baud rate now is 300 Bd.
6164.0717.02_01
> A3.5 >