MODEL 1200-04 IF PROCESSOR
1.0 General
1.1 Equipment Description - The 1200-04 IF Processor consists of a transmit and receive side. The receive
side consists of one IF signal passing through an Automatic Gain Control (AGC) amplifier and then split into
three output signals each having variable attenuators to adjust their levels via front panel multi-turn
potentiometers. The AGC amplifier adjusts a -95 to -15 dBm, 50 to 90 MHz IF input signal to a -30dBm,
+5, -15 dB output. A front panel output port provides a monitor signal directly out of the AGC amplifier,
and front panel potentiometers adjust the attenuation (between 0 and 20 dB) to each of the three output
signals, DIG1RX, FDMRX, and DIG2RX.
The transmit side consists of three transmit IF signals combined into one. DIG1TX, FDMTX, and DIG2TX
signals each pass through individual attenuators controlled via front panel potentiometers and a switch that is
controlled remotely through a DB9 connector or locally with three SPDT switches located on the front panel.
A SPDT switch on the front panel selects either REMOTE or LOCAL operation. A local override feature is
included such that when the REMOTE/LOCAL switch is left in the LOCAL position, the override pin on the
DB9 can be set to override the LOCAL control and allow for REMOTE control.
DIG1 and DIG2 on both transmit and receive sides are 75
in/out while FDM on both transmit and receive
sides are 50
in/out. When power is removed from the 1200-04, the FDM TX and FDMRX signals pass
through to the output. IF connectors are TNC female. The 1200-04 is housed in a 1RU x 14” deep chassis
and powered by a 100-240 ±10% VAC, 47-63 HZ input power supp
ly.
REAR
AC IN
GND
J107
DIG1
RX OUT
J106
J105
J108
J109
FDM
RX OUT
DIG2
RX OUT
RX
IF IN
CONTROL
FRONT
MODEL 1200
IF PROCESSOR
C
ROSS
T
ECHNOLOGIES, INC.
DC
J102
DIG1
TX IN
J101
J103
J104
FDM
TX IN
DIG2
TX IN
TX
IF OUT
OVERRIDE
LOCAL
DIG2
FDM
DIG1
SW1
SW2
SW3
SW4
LOCAL
REMOTE
ON
ON
ON
TX
IF MON
RX
IF MON
J1
J2
GAIN
T3
R1
R2
R3
T1
T2
DIG1
FDM
DIG2
FIGURE 1.1 Model 1200-04 Front and Rear Panels
1200-04 Manual, Rev. 0
Page 3
04/22/10
