Brief description Brief description - SSB

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Brief description
Weather satellite reception on 137 MHz
with Perseus, converter DCMDCM-137 and antenna WSPWSP-137
This guide describes reception of weather satellites on 137 MHz with a Perseus SDR. With two
further components this shortwave receiver becomes an efficient VHF monitoring station.
The components has to be set up as follows:
The antenna WSP-137, a cross dipole sytem with right-wing circular polarization, should be
mounted on the roof. Connect the coaxial socket of the antenna to the input of the
converter, and the output of the converter with the input of the receiver. Additionally, the
converter has to be supplied with a currency of 12 V=.
The converter transfers the range of 136-138 MHz to 28-30 MHz. The Perseus offers the option
to display the real reception frequency of the converter directly (for example 137.500 instead
of 29.500 kHz). Within the first 6 weeks after the initial installation of the Perseus software
this feature is enabled.
To get this function work permanently, it is necessary to buy the
„External Down-Converter Software Option License“
at http://microtelecom.it/perseus/software.html.
This license is available only from Microtelecom, not from SSB-Electronic.
The offset can be calculated from the difference between the lowest reception frequency
(136 MHz) and the lowest converted frequency (28 MHz):
136 – 28 = 108 MHz
If an external
external preamplifier is used,
used, its
its gain has to be entered at „Gain (dB)“.
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58638 Iserlohn-Germany
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Brief description
Furthermore, the frequencies of the four NOAA satellites with APT-weather fax transmissions
can be stored as memories. So not only the frequencies are stored, but also the corresponding
parameters.
The frequencies are:
NOAA 19 on 137.100 kHz
NOAA 18 on 137.912,5 kHz
Further parameters:
Demodulation: FM
Bandwidth: 40 kHz
So the Perseus software is configured already.
Converter operation is possible also without frequency correction; in this case the converted
frequencies has to be stored (29100, 29.500, 137.620 und 137.912,5 kHz).
The second part of this guide describes basic settings of the decoding software. We had good
success using the Freeware APTDecoder:
http://www.poes-weather.com/
After installation (SetupAPTDecoder-2.0.5.88.exe) it is necessary to set the own location, so
the corresponding pass times can be calculated. Furthermore the position dates of the
satellites have to be imported by the software, and the sound input source has to be defined.
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Brief description
Setting the listening location (Settings
(Settings – Groundstation)
Groundstation)
Download of recent KepplerKeppler-Data
Data from the Internet (Satellite
(Satellite – Kepplerian elements)
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Brief description
Setting the audio input source (Settings – General Settings – Custom)
For a lossless transfer of audio signals the software „Virtual Audio Cable“ is recommended.
Available at
http://software.muzychenko.net/eng/vac.html
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Brief description
Finally the system time of the PC has to be synchronized via Internet (under Windows 7 the
software must have been started explicitely as administrator with the right mouse button):
Time synchronization (Tools – Set time)
With these values APTDecoder now can calculate the satellite passes for the listening location
and a given date.
Pass list (Satellite – Pass list)
The calculated start of reception (AOS) is shown, as well as its duration. The frequency of the
next passing satellite should be set by choosing the corresponding memory at the Perseus.
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Brief description
On a world map the satellite’s location is shown in real-time (the reception range is indicated
by the yellow circle, while the listening location is marked by an “X”):
For a maximum display of the satellite signal the Perseus Button „Zoom“ should be activated.
During approach of the satellite the reception frequency is above the nominal frequency,
during overflight it is on the nominal frequency, and below the nominal frequency while
departing. This Doppler effect can be compensated by activating the Perseus Button „Afc“ (s.
screenshots):
Approaching satelli
satellit
atellite signal
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Brief description
Departing satellit
atellite signal
Activated
tivated AFC for compensation of the Doppler effect
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Brief description
,,, and finally a decoded weather fax:
Picture received from NOAA 18 documenting a storm over Europe on 11.11.2010
SSB-Electronic wishes a lot of fun.
Enjoy your radio on all frequencies and bands!
SSB-Electronic GmbH
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Brief description Brief description - SSB

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