Channel Tuning Configuration - Promax 8 SE Manual De Instrucciones

USER'S MANUAL. PROMAX-8
The following figure shows that when making C/N measurements in the relative
method (ΔF), it is essential to bear in mind the presence of adjacent channels;
otherwise, the noise could be confused with the signal of another channel.
Figure 20.- Example of digital channels spectrum.
Taking as example the previous figure, if we suppose that for the channels that
appear in the figure it has defined a bandwidth of 8 MHz, in the relative mode of
PROMAX-8
measurement the
Note that this method can cause erroneous measures in the measurement of the
channels D24 and D25.
For D24 it is advised to configure NOISE FREQ = -4.5 MHz and to verify if the
measurement increases. In case a channel has two adjacent channels (for example
channel D25) it is recommended to select the absolute mode and to assign to the
NOISE FREQ. parameter a frequency corresponding to a free channel (for example
between D26 and D27).
4.2.3.1.5

Channel tuning Configuration

In CHANNEL-FREQUENCY
mode, in channel tuning mode, when
pressing the CONFIG key [14] you will
access the first page of the configuration menu of the
parameters relative to this mode.
The parameters that may be changed
and their margins are shown in the following
table. For changing a given parameter turn the rotary
knob [9] until the field is activated (it will appear
shaded) and then press it. The value of the parameter
will be activated and may be changed by turning the
rotary knob. When the value you want appears, press
the rotary knob [9] to validate it.
09/2013
SE
SE will take as value for NOISE FREQ. = 4.0 MHz.
Figure 21.- Settings for digital channel
tuning mode.
Figure 22.- Settings for analog
channel tuning mode.
Page 25