Operating instructions

OPERATING MANUAL 2945A
46882-311D 3-67
Fig. 3-19 RF Sequential tones encoder display, main menu
Setting the Tones mode
The display is divided into three areas.
• At the bottom of the display is a table listing the frequencies allocated to the 15 tones, 0 to E.
Above the table is shown the system type, i.e. CCIR, ZVEI etc.
• At the top of the display is a panel in which the tone sequence to be transmitted is assembled
or edited.
• The centre of the display shows information relating to the parameters of the system.
Check that the system type shown above the frequency table is the same as the system type on
which the receiver to be tested operates. If this is not correct press the [Select Std] key to display
the
SELECT TONES STANDARD screen and menu as shown in Fig. 3- 20, Sequential tones
standard selection menu.
Fig. 3-20 RF Sequential tones standard selection menu
Select the correct system standard by pressing the appropriate key. The frequency allocation table
will change to relate to the selected standard and the settings of the tone duration parameters will
also change to the correct values for the system.
Return to the main sequential tones menu.
When the frequency allocation table is correct for the system, check that the other parameters are
correctly set. The tone modulation level has a default setting of 1.5 kHz but can be set by the user
to any level up to the instrument’s maximum of 75 kHz.