DIGITAL MODULATION MODE
3-28
Filter selection
To select the channel filter type between Root Raised Cosine, Raised Cosine and Gaussian, press
[Filter Type]
which displays the
[Channel Filter Selection]
menu (see Fig. 3-26 below).
LOCAL
Root
Nyquist
Nyquist
Gaussian
Gaussian/Bessell
C1631
EXIT
Channel Filter Selection
Root Raised Cosine
Raised Cosine
Fig. 3-26 Digital modulation: Channel filter selection menu
Pressing
[Root Nyquist]
,
[Nyquist]
or
[Gaussian]
respectively selects root raised cosine, raised
cosine or gaussian/bessel as the current RF channel filter.
Menu exit
Pressing
[Exit]
returns to the
Digital Modulation System Menu
(Fig. 3-9).
Filter
α
setting
When a Raised Cosine or Root Raised Cosine filter has been selected from the
Channel Filter
Selection
menu, the
α
of the filter can be set. Press the
[Filter Alpha]
key, enter the numeric value
of
α
and terminate with the [enter] key.
Filter band-pass 3 dB bandwidth setting
When a gaussian filter has been selected from the
Channel Filter Selection
menu, the band-pass
3 dB bandwidth of the filter can be set. Press the
[Bandpass 3 dB BW]
key, enter the band-pass
3 dB bandwidth point and terminate with either the [Hz] or [kHz] key.
Frequency deviation setting
When FSK modulation has been selected from the
FSK Selection Menu
, the frequency deviation
of the modulation system can be set. Press the
[Deviat'n]
key, enter the frequency deviation value
and terminate with either the [Hz] or [kHz] key.
Menu exit
Press [SIG GEN] to return to the
Sig Gen
menu where further selections may be made.