APPLICATIONS
4-10
Fig. 4-13 Receiver selectivity
−
receiver modulation setup menu
(9) When the A source is modulated press
[Rx Mod’n ON/OFF]
to toggle between the two states
as shown by the screen.
(10) If you want to apply modulation to the interferer (B source) press the
[Interf Mod’n]
key to
access the
Interferer Modulation Setup Menu
shown in Fig. 4-14 below. At the conclusion
press
[EXIT]
to return to the previous screen.
Fig. 4-14 Receiver selectivity
−
interferer modulation setup menu
(11) When the B source is modulated, press
[Int Mod’n ON/OFF]
to toggle between the two states
as shown by the screen.
(12) To select channel mode, use the
[Var/Chan]
key which toggles between the variable and
channel modes.
(13) Press the
[Channel Spacing]
key and enter the channel spacing frequency using the keyboard.
(14) Set the required interferer offset as a multiple of the channel frequency by pressing
[Offset
(Channel)]
and entering the number on the keyboard. Entering a negative number sets the B
source lower in frequency than the A source.
(15) For a finer control of channel spacing and offset, select the variable mode by means of the
[Var/Chan]
key and use the
[Increment Size]
and
[Offset (Freq)]
keys which are now
displayed. Entering a negative offset sets the B source lower in frequency than the A source.
(16) Set the selectivity ratio (the amount by which the B source level is greater than the A source
level) by pressing
[Select. Ratio]
and entering the ratio in dB.
