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Config Name
LNB A Configuration
The J1 Satellite Antenna Controller is capable of using and managing two LNB's.
In most conditions only one LNB is required.
Use LNB A as the primary LNB (modem LNB) when either one or two LNB's
are used.
LNB A LO Frequency
LO Frequency (Local Oscillator) is used in the LNB to mix with the
incoming RF signal to produce an IF Frequency in the 950 to 2150 MHz
range. The LNB manufacturer will normally mark the LO Frequency on
the side of the device.
To determine if an LNB will work with the J1 Controller and the Data
Modem add or subtract the Satellite RF Band from the LO. The resultant
frequencies should in the 950-2150 MHz range. Check with the Modem
supplier to see what IF Frequency is needed for your specific application.
Example;
The Default LO Frequency is 10750 MHz, for Ku Band the LO Frequency
is usually set between 9750 to 11300 MHz.
It is extremely important this value is set correctly for proper J1 operation.
LNB A Power
LNB power is the actual DC Voltage supplied through the coax cable.
This voltage is usually in the range 12 to 24 VDC (DC volts).
Some LNB's will use two different input voltages (13/18) to select either
LO Frequency or to change the RF Polarity (H/V).
If the LNB can see both polarities and the polarity is changed by voltage it
is important to note that depending on the physical assembly of the LNB
to the Feed Assembly that 13 Volts could be either H (horizontal) or
(Default)
(10750)
11,700 MHz – 10750 MHz = 950 MHz
12,200 MHz – 10750 MHz = 1450MHz
(18)
Setting required
The J1 Controller lets you choose the type of power to
control the LNB.
Setting required
34
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