Satellite SATCOM Services, Cross Technologies

The 1200-03 IF Processor consists of a transmit and receive side. The receive side consists of one receive IF signal going through an Automatic Gain Control (AGC) amplifier and then split into three signals, DIG1RX, FDMRX, DIG2RX each having variable attenuators to adjust their levels over a 30 dB output range via front panel multi-turn potentiometers. The AGC Amplifier provides automatic Gain Control for a 50 to 90 MHz IF signal for a -80 to 0 dBm input level to a -35 dBm ± 10 dB output. A front panel monitor port provides a monitor signal out of the AGC amplifier.

The transmit side consists of three transmit IF signals combined into one. Transmit DIG1TX, FDMTX, and DIG2TX signals each pass through individual attenuators controlled via front panel multi-turn potentiometers and a switch that is controlled remotely through a DB9 connector or locally with three 2PDT switches located on the front panel.

A 2PDT switch on the front panel selects either REMOTE or LOCAL operation. On the DB9 connector a closure to +V will turn the corresponding transmit channel on. A local override feature is included such that when the REMOTE/LOCAL 2PDT switch on the front panel is left in the LOCAL position, the override pin on the DB9 can be set to +V to override the LOCAL control and allow for REMOTE control. DIG1 and DIG2 on both transmit and receive sides are 75ohms in/out while FDM on both transmit and receive sides are 50ohms in/out. When power is removed from the 1200-03, the FDM TX and FDMRX signals pass through to the output.

The IF in and out connectors are BNC female. All circuitry is on a single PCB housed in a 1RU x 14” deep chassis. An internal switching power supply powers the unit with a 90-260 VAC, 47-63 HZ input.

1200-03 Front and Rear Panels

1200-03 Block Diagram

Equipment Specifications*

RX Input Characteristics
Frequency Impedance/RL Level range/1dB	70 ± 20 MHz 50 ohms/18 dB 0 to -80 dBm/+5 dBm
RX Output Characteristics
Impedance/RL Level, nom/max Level Adjust RX IF Mon Output Level	FDMRX 50 ohms/18 dB; DIG1RX,DIG2RX 75 ohms/18 dB -35 ± 10 dB/-10 dB -35 to -65 ± 10 dB at -35 dB nominal input -35 ± 10 dB
RX Channel Characteristics
Gain, AGC Gain adjustment Frequency Response	-40 to +40 dB, AGC range 0 to -30 dB, each channel individually adjustable ±1.0 dB
TX Input Characteristics
Frequency Impedance/RL Level range Level Adjust	70 ± 20 MHz FDMTX 50 ohms/18 dB; DIG1TX,DIG2TX 75 ohms/18 dB -20 to +5 dBm, 0 dBm nominal 0 to -30 dB with 0 dBm input
TX Output Characteristics
Impedance/RL Level range/1dB	50 ohms/18 dB -20 to +5 dBm/+10 dBm
TX Channel Characteristics
Gain adjustment Frequency Response Group Delay, max.	0 to -30 dB, each channel individually adjustable ±1.0 dB 5 ns
TX Switch Characteristics
Isolation, Switch off Isolation, Port to Port Switch time	>60 dB >50 dB, all "ON" <10 milliseconds
Controls/Indicators
Front Panel Controls SW1, SW2, SW3 SW4 Front Panel Indicators SW1, SW2, SW3 OVERRIDE DC Front Panel Monitors J1, J2	--- DIG1TX, FDMTX, DIG2TX switch - 2PDT REMOTE/LOCAL switch - 2PDT --- Green LED indicates DIG1TX, FDMTX, DIG2TX are ON Yellow LED indicates override of LOCAL control Green LED indicates power is supplied to the unit --- RX AGC Monitor, TX IF Out Monitor
Other
IF Connectors Connector, DC/Control Size Power	BNC, female DB9, female 19 inch standard chassis, 1.75' high x 14.0' deep 90-260 VAC, 47-63 Hz, 30W max

*+10 to +40 degrees C; 2000m max elevation; 80% max humidity; Specifications subject to change without notice