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R & S E K 8 9 5 / R & S E K 8 9 6
User Manual
f
Demodulation Mode
3.1.8.4 Demodulation Parameter Menu
By actuation of softkey FSK, AFSK or F7B (see
3.1.8.1 (R&S EK 895) or 3.1.8.3 (R&S EK 896)) the
demodulation parameter menu is called up.
The menu offers the following functions:
f SHFT (Freq. deviation menu)
f BD (baud rate menu)
f POL (alter signal polarity)
f STOP (TTY status menu)
> RUN (switch teletyper on)
> STOP (switch teletyper off)
f
E
F (Entering the frequency offset,
for FSK and AFSK only)
3.1.8.4.1 Selecting the Frequency Deviation
Actuation of softkey SHFT calls up the follow>
ing frequency deviation menu:
f 42 Hz
f 85 Hz
f 225 Hz
f 425 Hz
f more (R&S EK 895)
Upon actuation of softkeys SHFT and more (for
R&S EK895: FSK and F7B only) calls up the fol>
lowing frequency deviation menu 2:
f 62 Hz
f 125 Hz
f 250 Hz
f 500 Hz
f more
The currently effective frequency deviation is
indicated on the display by an underline of the
relevant value, e.g. 42
.
If 'more' is underlined, the currently effective
value is displayed in the other frequency devia>
tion menu.
3.1.8.4.2 Entering the Frequency Offset
(for FSK and AFSK only)
Upon actuation of softkey
E
F it appears the fol>
lowing display:
E
F xx_ KHZ ENT
(xx= frequency offset last stored)
The flashing cursor (_) indicates that an entry is
being expected.
Enter new frequency offset via the numeric
keypad.
Range of entry: ............. >3.000 to 3.000 kHz
Resolution: .................... 1 Hz
Entry: ............................ in kHz
3.1.8.4.3 Selecting the Baud Rate
Actuation of softkey BD calls up the following
baud rate menu:
f 50 Bd
f 75 Bd
f 150 Bd
f 300 Bd
f 600 Bd
The currently effective baud rate is indicated
on the display by an underline of the relevant
value, e.g. 150
.
3.1.8.4.4 Altering the Polarity
By actuating softkey POL the signal polarity is
switched over. The polarity switchover se>
quence varies as a function of the modulation
mode:
f FSK + Æ > Æ +,
f AFSK + Æ > Æ + and
f F7B ++ Æ > > Æ +> Æ >+ Æ ++.
Actuate softkey POL several times, as necess>
ary, until the desired polarity is indicated.
3.1.8.4.5 Switching the Demodulation
On / Off
Upon actuation of softkey STOP, it is possible
to switch the FSK signal (the same holds for the
signals AFSK and F7B) on (RUN) or off (STOP).
The currently effective setting is indicated on
the display by an underline, e.g. STOP
.
6164.0717.02_01
> 3.14 >
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