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WRAASE WRX-137 Operating Manual

Weather satellite receiver.
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Operating Manual
WRX-137 Weather Satellite Receiver
WRAASE electronic GmbH, Germany
General
The WRX-137 weather satellite receiver covers all polar orbiting weather satellites which
transmit in the analog APT mode. Beside the 5 fixed frequency channels any other frequency
between 134 and 141 MHz can be manually selected in 10kHz steps. Additional fixed
channels can be added by firmware-updates, if required. All modes and functions can be
manually selected by the front panel controls.
For unattended automatic operation and/or if the receiver shall be located at a remote location,
frequency selection can be remote controlled by software, either by the supplied program
"WRX137" or the actual satellite receive software "WxToImg" or Timestep "PROsat". The
WRX-137 receiver can feed the PC sound input for use with any popular soundcard-based
APT satellite image decoding software like "WXTOIMG". For this, the rear panel audio
output supplies an especially filtered subcarrier output signal with constant, but adjustable
level, independent of the front panel volume control.
The WRX-137P also supports "PROsat" and "JVComm" decoding software with its built-in
microprocessor controlled APT decoder and serial RS232 data output. "PROsat" and
"JVComm" allow full multitasking (receive images while processing and displaying other
stored images and/or running other software). Soundcard based software often has none or
only very limited mulitasking capability and suffers under time- and memory-consuming
processing. The WRX-137 was originally designed to also receive the WEFAX signals from
geostationary satellites. Since this is obsolete now, the second "CONV." marked
BNC
connector is now used as a second input for passive VHF antennas (no DC on that socket).
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   Summary of Contents for WRAASE WRX-137

  • Page 1 "WRX137" or the actual satellite receive software “WxToImg” or Timestep “PROsat”. The WRX-137 receiver can feed the PC sound input for use with any popular soundcard-based APT satellite image decoding software like "WXTOIMG". For this, the rear panel audio output supplies an especially filtered subcarrier output signal with constant, but adjustable level, independent of the front panel volume control.
  • Page 2 CONNECTIONS AND SETUP Power supply Power requirement is 12 to 16 V DC @ 200 mA. Voltage stability is not critical because it is internally stabilized. If you do not use the supplied AC power supply, carefully check the correct polarity: Center pin is (-) .
  • Page 3 After power is switched on, a welcome text will appear for a few seconds, indicating: “WRAASE WRX-137” and the firmware version number. The display then changes to show the question "PC control Yes / No?" . Press the " No"...
  • Page 4 Select Receiver WRX-137 and Baudrate 57600. If other software is used, which does not support automatic frequency selection, set the WRX-137 into the AutoScanMode for automatic, unattended image reception. The supplied program “WRX137.EXE” allows to modify the frequency and mode from a Windows dialog box.
  • Page 5 Due to an internal Windows-problem, Windows sometimes interprets the dataflow from the WRX-137 wrongly and installs an additional mousedriver, causing the cursor the jump around like crazy. To avoid such problem, don’t have the WRX-137 connected or running when booting Windows.

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