This is turning on/off the power supply to the Converter via the antenna cable. The need to turn off the LNB power is rare, for example - if the power to the Converter is supplied through the power injector.
Voltage 13/18 Volts are not only the supply voltage but also the switching signals of polarization. 18 V is the horizontal H (left L) switching signal in the range of 16-20 Volts, and 13 V is the vertical V (right R) switching signal in the range of 11-14 Volts
LNB Type and LNB Freq
LNB Type and LNB Freq - select the type of сonverter/frequency of the heterodyne corresponding to it. There are only three options, the first for the C-band with a frequency of 5150 MHz and heterodyne the second two for the Ku-band: universal, linear polarization, two-band with two frequencies of the heterodyne (because it is universal) and Circular (Circle).
Ku-band 10700-12750 MHz consists of two sub-bands:
Low Band (lower) 10700-11700 MHz
High Band (upper) 11700-12750 MHz
Which overlap each with their lo: 9750 MHz lower and upper 10600 MHz.
The circular (Circle) Converter has a single heterodyne frequency of 10750 MHz, so it is considered single and covers only one half of the Ku range of 11700-12750 MHz.
No matter what type you have not used the Converter, it performs the same job: convert the carrier frequency in the interim. This is how it happens:
Carrier frequency (transponder) — heterodyne Frequency = intermediate frequency
As a result, the intermediate frequency (if) in the range of 950-2150 MHz descends through the antenna cable from the Converter to the receiver.
A 22 kHz signal is a sub-band switching signal. When 22 kHz is on, the upper range (High Band) is taken and in the absence of this signal, respectively, the lower (Low Band). In case of universal Converter this option is not active, the selection is made automatically depending on the selected frequency.