CDM-Qx Satellite Modem

Revision 5

External Connections

MN/CDMQx.IOM

4.4.9RX and TX IF Connectors

The IF connectors will depend on the configuration ordered. The following reflects configurations available. BNC 75Ω is standard for 70/140MHz IF, N-Type 50Ω for L- Band, and BNC Ref Connector. This 50Ω BNC female connector provides an external reference input for the Tx and Rx IF synthesizers, and for the internal transmit clock. The load impedance is 60.4Ω, so the VSWR is less than 1.25:1 at either 50Ω or 75Ω. Input level is 0 dBm minimum to +20 dBm maximum at either 1, 2, 5, 10, or 20 MHz. When external reference is enabled, the internal 10 MHz reference oscillator is phase locked to the external reference input by a 10Hz bandwidth PLL. If no activity is present at the external reference input, the modem will revert to the internal 10 MHz reference.

4.5AC Power Connector

Astandard, detachable, non-locking, 3-prong power cord (IEC plug) supplies the Alternating Current (AC) power to the modem. Observe the following:

AC Power Specifications

Input Power

290W maximum, 57W typical without BUC power supply.

Input Voltage

100 - 240 volts AC, +6%/-10% - autosensing

 

(total absolute max. range is 90 to 254 VAC)

Connector Type

IEC

Fuse Protection

3.15A Slow-blow

 

Line and neutral fusing

 

20 mm type fuses

4.6DC Power Connector

A standard, 3-screw terminal block supplies the Direct Current (DC) power to the modem. Observe the following:

AC Power Specifications

Input Power

290W maximum, 57W typical without BUC power supply.

Input Voltage

36 to 72 VDC; 6.25 amps

Connector Type

Terminal Block

Fuse Protection

3.15A Slow-blow

 

20 mm type fuses

4–12

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Mocomtech CDM-QX operation manual RX and TX if Connectors, AC Power Connector, DC Power Connector, AC Power Specifications