COBHAM SOLO4 Especificações descarregar pdf (Página 54)

Down converter LO

This field allows definition of the local oscillator frequency in the

connected downconverters.

For domo supplied downconverters, this should be set as follows:

• 1880MHz for S band transmissions (2.28 to 2.55GHz)

• 1700MHz for L band transmissions (1.15 to 1.4GHz).

Down converter LO side

This field allows definition of the local oscillator side.

For domo supplied downconverters, this should be set as follows:

• LOW for S ba

nd transmissions (2.28 to 2.55GHz)

• HIGH for L band transmissions (2.28 to 2.55GHz)

OFDM Bandwidth

This field displays the width of the received OFDM signal and should be

set to 2.5MHz for normal SOLO4 system operation, and should be set

to 8MHz for normal SOLO2 system operation.

OFDM Guard Interval

In this field the user selects the guard interval which matches the

transmitter. For SOLO4 systems typically a guard interval of 1/16 is

used, however on very long range transmissions a guard interval of 1/8

may be employed. For SOLO3 systems typically a guard interval of

1/32 is used, however on very long range transmissions a guard interval

of 1/8 may be employed.

OFDM Mode (Status Only)

This field displays the COFDM constellation that is being demodulated

at the receiver. In normal operation this will match that selected at the

transmitter.

OFDM FEC (Status Only)

This field displays the COFDM FEC (Forward Error Correction) that is

being demodulated at the receiver. In normal operation this will match

that selected at the transmitter.

Input SNR (Status Only)

For each IF input, the SNR (Signal to Noise Ratio) is reported. Values in

the order of 18dB to 22dB represent strong received signals, whilst

values in the order of 5dB represent poor received signals which will

likely give rise to decoding error

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COBHAM SOLO4 Especificações Página 54