Chapter 6 ______________________________________________________________ Maintenance 
VAISALA ______________________________________________________________________ 257 
Give the desired frequency value and terminate the input with <CR>. 
Any change to the Main Transmitter Modulation Frequency will result in 
the closest available value the transmitter measurement unit is able to 
realise due to the restricted frequency generator resolution. 
The result can be read at the displayed values at Freq. 
Example: On the advance command level, the Main Transmitter 
Modulation Frequency must be decreased (see Figure 149 below). 
 
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Figure 149  Decreasing Main Transmitter Modulation Frequency 
Example: On the advance command level, the Main Transmitter 
Modulation Frequency must be set to 994 Hz (see Figure 150 below). 
 
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Figure 150  Setting Main Transmitter Modulation Frequency to 
994 Hz