Kantronics KPC-4 - Page 40

Finding WEFAX Broadcasts
There
are
approximately
50
commercial
and
governmental
WEFAX
transmitters
located
in
over
20
countries
around
the
world.
Most
broadcast
on
HF
(between
3
and
30
MHz).
Many
broadcast
continually
while
others
are
on
a
sporadic
schedule.
You
will
nearly
always
find
the
following
if
ionospheric
conditions
permit:
LOCATION FREQUENCIES (MHz)
Halifax, NS 4.275, 6.630, 9.890, 13.510
Norfolk, VA 8.080, 10.865, 16.410
San Diego, CA 8.646, 17.410
Mobile, AL 9.158
San
Fran,
CA
4,346,
8.682,
12.730,
17.151
Washington,DC
4.795,
10.185,
12.205,
14.672
In
addition,
many
of
the
frequency
guides
for
sale
by
various
radio
equipment
suppliers
list
WEFAX
station
frequencies.
Tuning WEFAX Signals on HF
As
mentioned
earlier,
WEFAX
broadcasters
use
an
800
Hertz
shift
FSK
format,
using
mark
and
space
frequencies
of
1500
and
2300
Hertz
respectively.
These
tones,
like
voice
broadcasts,
are
used
to
modulate
the
station
RF
carrier.
You
can
tune
these
signals
with
your
standard
1200
baud
packet
modem
by
tuning
1.7
KHz
below
the
published
station
frequency
in
upper-sideband
(USB).
For
example,
with
your
HF
transceiver
or
receiver
set
to
USB,
turn
the
dial
until
the
frequency
readout
shows
8078.3
to
receive
NAM
(the
Norfolk
US
Navy
Fleet
Weather
Service
transmitting
on
8080
KiloHertz).
Receiving WEFAX Transmissions
To
receive
WEFAX
you
need
to
connect
an
audio
cable
from
your
HF
receiver
to
the
audio
input
of
your
TNC.
The
KPC-4
uses
Port
2
and
the
KAM
uses
the
VHF
port
for
receiving
WEFAX.
You
should
connect
an
audio
cable
from
the
audio
output
jack
of
your
HF
receiver
to
the
correct
audio
input
pin
of
the
KPC-4/KAM
to
receive
the
WEFAX
signal.
With
the
KAM
you
can
connect
the
audio
from
your
HF
receiver
to
the
VHF
and
HF
ports
at
the
same
time
and
use
the
bargraph
tuning
indicator
to
tune
your
WEFAX
station.
For
the
dual
port
communicators,
you
will
need
to
set
MAXUSERS
to
0/1,
and
for
the
single
port
units,
set
MAXUSERS
1
before
starting
WEFAX
reception.
Be
sure
to
read
the
documentation
that
comes
with
your
WEFAX
program
to
determine
how
to
use
it.
All
of
the
programs
available
from
Kantronics
will
require
that
you
set
MAXUSERS
as
listed
above,
and
each
of
them
will
issue
the
proper
WEFAX
command
to
start
the
reception
of
the
image.
The
programs
will
work
best
at
higher
ABAUD
rates,
and
we
suggest
9600
for
the
PC
and
Macintosh
based
programs,
and
1200
for
the
Commodore
64.
Versión
2.85
©
Copyright
1989,
Kantronics,
Inc.
All
Rights
Reserved.
ersion
4.
Duplication
of
this
manual
or
the
firmware
without
Operations
Manual
;
permission
of
Kantronics,
Inc.
is
prohibited.