Installation
32 Block Up Converter Systems 6700/6900 series User Guide
Cable recommendations
Table 9 lists the recommended specifications for IF coaxial
cables used in your system. These specifications place
restrictions on the maximum length of the transmit IF cable.
The limiting factor is most likely the 20 dB maximum cable
loss. Cables that have 20 dB cable loss at L-Band frequencies
usually have DC loop resistances much less than those shown
below.
Cable loss specification
The recommended maximum cable loss is derived from the
maximum output power normally provided by modems and
the maximum gain of the BUC.
Table 9: Recommendations for IF coaxial cables
Characteristic Recommendation
Cable loss at operating
frequency
20 dB maximum
DC loop resistance 2 Ω maximum (+48 V BUC)
1 Ω maximum (+24 V BUC)
Screening 100 dB minimum
Nominal impedance 50 Ω
Connectors BUC end: N-type male
connector
Indoor end: connector to suit the
modem used
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