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DWG ID: 181-0101-00A
Date: 2003-09-26
potentiometer also varies this dc-offset level. Thus there is an interaction of the dc levels
when adjusting the RX GAIN and RX ADJ 2.5 V. The received signal and dc offset at
the modem IC RXFB terminal, U3-23, is adjusted for a 1 V pp signal and a dc offset to
match the VBIAS dc level at U3-21.
Internal temperature is monitored by U4.
There are six LEDs for indications of operation.
DS1 TX
Unit is transmitting
DS2 RX
There is a carrier on frequency
DS3 A
1
User definable through programming
DS4 A
2
User definable through programming
DS5 A
3
User definable through programming
DS6 PWR
Power to the unit is on
To keep digital noise out of the analog circuitry there are se5 V supplies for the
analog and digital sections. Voltage regulator VR1 supplies power to the radio
transceiver, the analog circuitry voltage regulator, VR2, and the digital circuitry voltage
regulator, VR3.
12.4
GPS Receiver, A2A1
The GPS receiver system consists of a GPS receiver circuit card assembly and an external
active antenna for reception of GPS signals from the GPS satellites.
The GPS RCVR CCA has a Trimble Lassen SQ GPS RCVR module that is the heart of
the system. IC voltage regulator, VR1, supplies 3.3 V dc to the Trimble GPS RCVR,
RE1, and the level translator, U1. RE1 in turn supplies dc voltage out the RF connector,
RE1J1, to the externally connected Trimble antenna. The GPS signals are brought into
the receiver over the transmission line into this same connector. The GPS information
signals are sent to the microprocessor, on the Controller CCA, through level translator,
U1. Battery backup is provided but is not necessarily needed. The battery backup reduces
the acquisition time if the unit has been off for a period of time.
The A2A1 CCA may have other functions designed in the future.
12.5
Input/Output CCA, A3
The I/O CCA, part number 001-0008-01, has eight analog inputs, four discreet inputs,
four analog outputs, and four discreet outputs as follows: