APPLICATIONS
46882/439 4-17
B3407
Fig. 4-23 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. 4-24 below. At the conclusion
press [EXIT] to return to the previous screen.
B3408
Fig. 4-24 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.
(17) At any time during the test you can press [Summary] then [Source Summary] to display the
Source Summary screen similar to that shown in Fig. 4-25 below. This shows the allocated
frequencies and levels of all three sources to confirm your selection.
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