Comtech EF Data CST-5005 - Manual (Page 43)

CST-5005 C-Band Satellite Terminal Single Thread System Installation
Rev. 1 2–21
2.5.3 RX/IF Output (J3)
The RX/IF output goes to the indoor unit, and utilizes a type N connector.
The output impedance is 50
Ω
, and the frequency is 70 MHz, ± 18 MHz (optional
140 MHz, ± 36 MHz).
The 1 dB output compression point is +15 dBm minimum.
Nominal output power operation is +9 dBm (-6 dB from 1 dB compression) to -27 dBm,
depending on system gain requirements.
The down converter has 24 to 45 dB of gain, and is adjustable by the customer from 0 to
21 dB of attenuation.
The typical system gain includes a 50 dB LNA, making the total system gain 74 to
95 dB.
Note: A 60 dB LNA is only used when there are extremely long cables from the LNA to
the down converter.
2.5.4 RX/RF Input (J4)
The RX/RF input comes from the LNA, and utilizes a type N connector.
The input impedance is 50
Ω,
and the input frequency range is from 3.620 to 4.200 GHz.
The input signal level ranges between -53 dBm and -30 dBm, depending on LNA and
antenna gain.
The input level should be set to give the required signal level at J3, the RX/IF Output
(refer to Section 2.5.3).