Notes For All Schematics and Circuit Boards Chapter 1: 2-7
6881091C63-A
LOCK Lock Detect Signal from Synthesizer
LSIO Low Speed Clock In / Data Out
LVZIF CS LVZIF Chip Select (not used)
MIC Microphone Input
MISO Serial Peripheral Interface Receive Line
MODIN Modulation Signal into the Synthesizer
MOSBIAS 2 PA Bias Voltage for Second Stage
MOSBIAS 3 PA Bias Voltage for Third Stage
NOISE BLNKR Noise Blanker Enable (Low Band only)
ON OFF CONTROL Service Request Line from Control Head / Manual
Switching On of the Radio's Voltage Regulators
ON OFF SENSE (Control Head) On/Off Sense Line to Control Head µP
ON OFF SENSE (Controller) Service Request Line from Control Head
OPT CS Option Board Chip Select
OPT PTT PTT from Option Board
PA PWR SET ASFIC Output Voltage to set the Transmitter
Power
PA SWB Switches Supply Voltage for PA Current Control
Circuitry
PA SUPVLTG 13.2 V Supply Voltage of the Transmitter PA
PCIC MOSBIAS 1 PA Bias Voltage for First Stage
PRESC Prescaler Signal from VCO to Synthesizer
PTT IRDEC Microphone PTT Input
PTT IRDECODER Microphone PTT Input
R W Read Write Signal for RAM / Flash
RAM CS RAM Chip Select
RDY Service Request Line from Option Board
REF CS Reference Chip Select (not used)
RESET Reset Line
ROW x Keypad Matrix Row x
RSSI Received Signal Strength Indicator
RX ADAPT Flat TX Path Disable during Transmitter Key-up
RX AUD RTN Option Board Input / Output of Receiver Audio
Path
RX FLAT FILTERED AUDIO Flat or Filtered Audio to Accessory Connector
RXIN RF Signal from Antenna Switch into the Receiver
RXINJ RF Signal from the VCO into the Mixer
SCI RX Serial Communication Interface Receive Line
SCI TX Serial Communication Interface Transmit Line
SPI Serial Peripheral Interface Bus
SPKR- Negative Audio PA Speaker Output
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