title: “Disec LNB”
date: 2021-03-13T19:33:04
slug: 1630-2

Between Ku and C Band the LOF you must setup are different. LOF stands for Local Oscillator Frequency and is given in MHz or GHz.

A satellite signal has a high frequency when they arrive on Earth and the LNB of your satellite antenna. In the LNB, the signals experience amplification, filtering and conversion of the received frequency to a lower one. Because if you would transmit the signals with the high frequency over a normal coaxial cable, they would be useless after a few meters (2 to 3 meters).

To avoid this problem, a separate and lower frequency (LOF) is generated in the LNB, which will send over the coaxial cable.

Depending on the LNB and received frequency range, the frequency at the output of the LNB can be calculated differently:

In Ku band:
Working frequency for the receiver = carrier frequency of the satellite transponder – LOF

In the C band:
Working frequency for the receiver = LOF – carrier frequency of the satellite transponder

The basic frequency for Ku Band LNBs are:

LOF Low (For Lowband) = 9750 MHz
LOF High (For Highband) = 10600 MHz
LOF Switch: 11700 MHz

The basic frequency for C Band LNBs are:

LOF Low (For Lowband) = 5150 MHz
(LOF High (For Highband) = 5150 MHz
LOF Switch: 5150 MHz

(A C-Band LNB has no High and Low Band and also no Switch between those both bands, so enter overall the Low Band frequency)

The most programs and software have settings for C-Band and Ku-Band. If you must enter the LOF directly, you can use the values above. For Max Series cards use the V/L and H/L inputs together with the settings above in your software. If your C-Band satellite use a circular (L-R) polarization instead of linear (V-H), then use for:

R = V/L
L = H/L

UNIVERSAL LNB
static char \*univ\_desc[] = {
"Europe",
"10800 to 11800 MHz and 11600 to 12700 Mhz",
"Dual LO, loband 9750, hiband 10600 MHz",
(char \*)NULL
};

Technical specifications
Commited Switch
Low band input frequency range 10.7 GHz ~ 11.7 GHz
Low band output frequency range 950 MHz ~ 1950 MHz
Low band LO frequency
9.75 GHz
High band input frequency range
11.7 GHz ~ 12.75 GHz
High band output frequency range 1100 ~ 2150 MHz
High band LO frequency
10.6 GHz
Noise figure
0.2 dB typ. (0.7 dB Max.)
LO temperature drift ± 3.0 MHz max.
LO initial accuracy ± 1.0 MHz max.
LO phase noise @ 10 kHz
-90 dBc/Hz
Conversion gain
60 dB min.
Gain ripple (over 26 MHz bandwidth) ± 0.75 dB
Gain variation (over full band) ± 4 dB max.
Image rejection
40 dB min.
1 dB compression point (@ output) 0.0 dBm min.
Cross talk
22 dB min.
Control signal Ca (V)
11.0 V ~ 14.0 V
Control signal Cb (H)
16.0 V ~ 20.0 V
Control signal Cc (band switching)
22 kHz ± 4 kHz
Output VSWR
2.0 : 1
In band spurious level -60 dBm max.
Current consumption
200 mA max. (11 VDC ~ 20 VDC)
Operating temperature
-30 °C ~ +60 °C
Output impedance
75 Ω (F-type)
Output connector type
F-Type (female)
Weight 344 g