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F1
LENGTH SELECTOR
F2
BAUDRATE SELECTOR
F3
MODE RECALL
F4
FORWARD SEQUENCE
F4+F3
REVERSE SEQUENCE
ARQ CCITT-3 sounds very similar to
Amtor-Sitor,
except
impression of a slower Baud rate
due
to
the
longer
characters and pauses. The standard
speed
is
96
Baud
l e n g t h
i s
u s u a l l y
characters. A Baud rate measurement
is very difficult because there is
no
signal
between
blocks.
Therefore,
causes measurement errors.
This system is similar to the Sitor
The timing of the 2 stations looks like:
five 7-bit characters transmitted
one 7-bit acknowledgement received
five inverted 7-bit characters transmitted
etc.
F1
SPEED CHECK
F2
BAUDRATE SELECTOR
F3
MODE RECALL
F4
FORWARD SEQUENCE
F4+F3
REVERSE SEQUENCE
Every
SI-ARQ
transmit in this FEC - Broadcast
mode,
and
the
commonly used is 96 Baud. SI-FEC
sounds very similar to SITOR-FEC.
T h i s
i s
a n o t h e r
broadcasting which does not require
an
ac k no w led ge me nt
one
has
blocks
and
the
block
5
o r
the
character
interference
station
can
also
Baud
rate
most
c o d e
fr o m
Block length preset for 4, 5 or 6
characters
Selects standard or variable Baud
rates
Redisplay of the mode as well as re-
synchronization
go to next operating mode
go to previous operating mode
ARQ system, it is a single
the
frequency simplex system.
Transmitted block can have a length
for
of 4, 5 or 6 characters. A cycle is
twice as long as the block length.
If the ISS receives the
6
acknowledgement, then the next
block is transmitted with opposite
phase. The transmission rate can be
chosen from among several Baud
rates. The Wavecom software always
receives the ISS (Information
Sending Station).
Displays the baud rate
Selects Baud rates manually
Redisplay of the mode as well as re-
synchronization
go to next operating mode
go to previous operating mode
recipient.
transmitted twice, the second time
in inverted form and if recognized
as error-free, the decoder releases
it
for
transmitted
f o r
with
an
outputs
th e
"_".
Each
character
output.
However,
character
is
error,
then
the
the
underline
Page 25
is
if
the
received
decoder
character
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