11.8.10 TCR Clock - Time Code Reader and Generator
The IMS - TCR180 serves to decode and generate mod-
ulated (AM) and unmodulated (DC Level Shift) IRIG-
A/B/G, AFNOR, C37.118 or IEEE1344 time codes.
AM-codes are transmitted by modulating the ampli-
tude of a sine wave carrier, unmodulated codes by
variation of the width of pulses.
As standard the clock module TCR180 is equipped
with a OCXO-SQ (Oven Controlled Xtal Oscillator) as
master oscillator to provide a high accuracy in holdover
mode of
±
1E-8. Optionally an OCXO-MQ or OCXO-
HQ is available for better accuracy.
Receiver:
Automatic gain control within the receive circuit for
modulated codes allows decoding of IRIG-A/B/G,
AFNOR, C37.118 or IEEE1344 signals with a car-
rier amplitude of 600 mV
pp
to 8 V
pp
. The input stage
is electrically insulated and has an impedance of ei-
ther 50
Ω
, 600
Ω
or 5 k
Ω
, selectable by a jumper.
DC Level Shift Input insulated by optocoupler with
internal series resistance of 220
Ω
.
LED Indicators
Init
blue:
while the receiver passes the initialization phase
off:
Oscillator not warmed up
green:
the internal timing of the TCR180 is synchronized to
the received time code (Lock)
Data
green:
correct time code detected
red:
no correct time code detected
yellow:
TCR180 synchronized by external source (MRS)
yellow/green (flashing):
Holdover mode (MRS), IRIG Code available
yellow/red (flashing):
Holdover mode (MRS), IRIG Code not available
Tele
green:
telegramm consistent
red:
telegramm inconsistent
yellow (flashing):
Jitter too large
Fail
red:
the internal timing of the TCR180 is in holdover mode
off:
the internal timing of the TCR180 is synchronized
to the received time code (Lock)
76
Date: 27th May 2021
IMS - LANTIME M4000
