WSPR, JT9, and
JT65
These modes are used for weak
signal communication. Oftentimes,
these signals are so weak they are
not perceptible by ear. These modes
are used in special segments of the
ham bands. For example, WSPR can
be found on 14.095600 MHz and
JT65 can be found on 14.076000
MHz. Note the precision of the dial
settings. See Figure 6 for a JT65
screenshot.
Included with the programs are
dial frequencies for all bands. WSPR
has its own website for reporting
spots, while JT9/JT65 uses
PSKreporter. These programs can be
found at www.physics.princeton.
edu/pulsar/K1JT.
Weak signal modes require
coordination of your PC with
Universal Coordinated Time (UTC) to
within one or two seconds. Make
sure to set your computer clock
accordingly and check it often.
Software for
FAX, SSTV, and
EasyPal
FAX can be received with
MULTIPSK or Fldigi. Figure 7 shows a
satellite image received with
MULTIPSK. It is over the Pacific
Ocean south of Mexico. The picture
has several breaks — probably caused
by errant Internet packets as
mentioned earlier.
Nonetheless, receiving these FAX
images is interesting and gives you an
idea of how many packets are lost
over time.
Fax signals can often be found
around 12.748 and 12.788 MHz.
Slow scan TV signals can be found
around 14.230 MHz. Several
programs are available on the
Internet for SSTV including
MULTIPSK.
One of the newer picture modes
is EasyPal, which transmits pictures
digitally. It can be found at 14.232
MHz. Perfect pictures can be
received if the signal manages to
make it through the noise. Search for
it on the Internet.
Final Comments
It can be challenging to utilize
radio receivers located around the
globe. Hopefully, you have learned a
little bit about how to receive and
decode Web based shortwave data
signals.
With the methods shown here,
you should be able to get your
station working with a minimum of
fuss and no cable hardware.
So, sit back and start having fun
with your virtual radios. NV
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