Mode Indicator Leds; The Dcd Led - Data Carrier Detect; Leds At System Start; Tuning Indicator - AEA PAKRATT PK-232 Operating Manual

USER'S GUIDE
3.2.2

Mode Indicator LEDs

STBY
MODE L
FEC
ASCII
BAUDOT
ARQ
CHECK
PKT
MORSE
3.2.2.1

The DCD LED - Data Carrier Detect

Use the DCD LED as an indication of channel activity. Your PK-232 detects activity on
the channel (busy condition) by monitoring the demodulator's lock-detect signal and
lighting the DCD LED when a valid signal exists. When the other station transmits, the
DCD LED on your PK-232 should be lit for the duration of the received Packet
frame.
If the DCD LED is lit by random noise, rotate the THRESHOLD control counterclockwise
until the DCD LED is extinguished. Valid received packets will almost always light the
DCD LED, although your PK-232 may actually decode packets too weak to light the DCD
LED.
3.2.3 LED at System Start
You PK-232 always starts in the Command Mode. At system start-up, or each time you
type the RESTART command, your PK-232 shows its status on the front-panel LEDs:
3.2.4 Tuning Indicator (See Figure 2-1)
Two center bars are lit when a tone is not present. When a "mark" tone is received, the
bars at the left side of the display will be lit. Received "space" tones will light bars at the
right side of the display. A properly-tuned signal is symmetrically divided, with the bright
bars at the ends of the display. A properly-tuned CW signal shifts the lit bars from the
center to the right side of the display in rhythm with the Morse keying.
In FM, tones are set by the sending station and can't be changed by the received station.
PK232UG Rev. B 9/86
ARQ/FEC Standby
ARQ - Listen
FEC - Mode B
ASCII Code
Baudot/CCITT Code Lit when system is in Baudot RTTY Mode
ARQ - Mode A
Undefined
Packet
Morse Code
STATUS: CMD lit
Lit when AMTOR ARQ or FEC Mode
Lit when system is in AMTOR Listen Mode
Lit when system is in AMTOR FEC Mode
Lit when system is in ASCII RTTY Mode
Lit when system is in AMTOR ARQ Mode
Reserved for possible future application
Lit when system is in Packet Mode
Lit when system is in Morse Mode
3-2
BASIC OPERATION
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