KWS Electronic VAROS 109, Руководство пользователя

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Chapter 6 - Measuring range
10911 V01.06
15
Chapter 6
Measuring range
6.1 Frequency input
Frequencies are displayed in the frequency window. Enter the value of the frequency in MHz or GHz
(see below). Set the desired frequency using the number keys or arrow keys. The decimal unit can
be changed from 0-9 by pressing the
Up
and
Down
arrow keys when the cursor is on that unit. Use
the
<-
and
->
keys to move the cursor left and right. Pressing a number key enters the corresponding
value in the lowest decimal unit. All the positions above are set to zero. Every time an additional
number is entered, the existing value shifts a position to the left and the latest entry is used for the
lowest unit. Confirm by pressing
ENTER
. If the value entered is not within the valid range, it will be
limited to the corresponding minimum or maximum value.
After that, the receiver is tuned and the actual measured values are displayed.
Press the
ESC
key, an arrow key or a number key to end the measurement procedure. A new
frequency can be set as described above.
6.1.1 IF input
To change the instrument to IF input, select
MODE -> Frequency input mode -> SAT-IF
. The
frequency window displays
SAT-IF [MHz]
.
6.1.2 RF input
To change the instrument to RF input, select
MODE -> Frequency input mode -> RF[GHz]
. The
frequency window displays
SAT-RF [GHz]
. This function serves to incorporate frequency conversion
in an LNB from the transponder frequency (RF) to the first SAT IF, depending on the LNB oscillator
frequency (LO).
For Ku band LNBs: IF = RF – LO. The instrument calculates: RF = IF + LO.
For C band LNBs: IF = LO – RF. The instrument calculates: RF = LO – IF.
6.1.2.1 Ku band
The device provides two user-defined LNB oscillator frequencies for RF inputs in the Ku band. These
can be changed under
MODE -> Settings -> LNB-Frequencies -> Ku low band
(Ku high band)
within the range of 9000 to 11000 GHz. The factory presettings are 9750 GHz (low band) and 10600
GHz (high band).
The device also provides three ways of using the two oscillator frequencies: Using the menu
MODE
->
Settings
->
LO-Allocation
, choose between “Ku standard” (coupled to the LNB setting), “Ku
LOLow” (low-band oscillator always incorporated regardless of LNB setting) and “Ku LOHigh” (the
high-band oscillator respectively).
6.1.2.2 C band
The instrument provides one user-defined LNB oscillator frequency for RF inputs in the C band. This
can be changed under
MODE -> Settings -> LNB-Frequencies -> C band
within the range of 4,000
to 6000 GHz. The factory presetting is 5150 GHz. To use the LNB oscillator frequency, select the “C
band” menu item via
MODE -> Settings -> LO-Allocation
.
If the device is operating with RF input, the LO used is shown in the frequency window with the
abbreviations “KuL” (LO for Ku low band), “KuH” (LO for Ku high band) or “_C_” (LO for C band).