WRAASE WRX-137 Operating Manual

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 Since this is obsolete now, the second "CONV."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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