Wavecom W 4010 User Manual page 18

When packet radio mode is selected,
the defaults are 1200 baud and copy
all packets. On the two meter band,
1200 baud in FM is usually used,
and on shortwave 300 Baud in SSB
with A FSK. A
shortwave frequency is: 14.103 MHz
3 kHz.
The LEVEL and
are not active with the VHF input.
The AFSK signal with 1000 Hz shift
undergoes separate
decoding. The squelch
receiver should be used.
For operation
d e c o d e r u s e s
demodulator, and
LEVEL adjustments are active. The
LEVEL adjustment
set counter-clockwise, but can be
used as a tuning aid. The post-
demodulation filter
frequency which
tuning display will flicker.
The software offers the possibility
of eliminating the U and S control
packets by using the F3 key as a
toggle switch.
(information)
displayed.
With packet radio many stations can
be active on the same frequency.
Stations are "connected"
and the other channel activity has
no influence on stations that are
connected together.
The WAVECOM decoder
advantage that
certain station
Flag
A flag, consisting of the sequence
01111110, is sent at the beginning
and at the end of every block.
The address can
characters, usually only 16 or 24
are used (direct connection or via
1 repeater). The AX.25 standard has
several different
three of which are the I, S and U
frames. Information
commo nly used
FILTER adjustments
filtering
on the
on shortwave,
a q u a d r a t u r e
the FILTER
can normally
has a higher
means the
If used, only
packets will
together
offers
all traffic of
can be monitored
Address Control
have up to
frame types,
is almost
without monitoring the rest of the
channel activity.
After choosing
mode, it
monitoring
last two
signs are
memory and can be selected with the
F2 key. Originator, recipient, and
possible
selected one after the other. After
and g o i n g
FM possibilities, the monitor mode is
selected
are received. Whenever the packet-
the radio mode is chosen, the stored
call signs
and packets are received again, key F2
has no function.
be
The call
station
line, and only packets that have
LED this call
output,
originator, recipient, or possible
first repeater.
possible to monitor all activity of
a certain station or repeater.
I
be The amateur
h a s b e e n
commercial
ISO HDLC). Amateur packet radio has
sprea d
initiative of an American club T.A.
P.R. Packet radio is a synchronous
transmission. The data is usually
sent as ACSII characters.
the With packet
a conveyed
follows:
Data
always transmitted
seldom in U frames. The S and U
frames are used in controlling and
m o n i t o r i n g
80 progress.
contain up to 256 characters, and
as the transmission is transparent
all characters
combinations are allowed. The FCS
field contains the check sum.
the packet-radio
becomes active
mode as default.
or three station
continuously
first repeater
t h r o u g h t h e s e
again where all
are deleted.
sign of the
appears in the
sign will
regardless whether
It is
radio standard
d e r i v e d f r o m
standard (CCITT
ra pidl y, due
radio information
in blocks(frames)
FCS Flag
in
t h e t r a n s m i s s i o n
The data field
and
Page 18
with
The
call
stored in
can be
3
packets
Until
selected
command
reach the
from
therefore
AX.25
t h e
X.25,
to t he
is
as
I frames,
can
character