Saturday, May 22, 2010

EMWIN Software Demodulator

Several users have reported problems with installing the NWS EMWIN Software Demodulator on Windows 7 computers.  Those problems are related with User Account Control (UAC).  In most cases turning off UAC allowed the software to install properly. 

I had a user attempt to install the EMWIN Software Demodulator on a Windows 7 64 bit system.  The NWS installer kept reporting that Data1.cab was corrupted.  Right now I don't know why it reported that file as corrupted.

In order to get around this problem, I created a new installer for the EMWIN Software Demodulator.  The new installer corrects a number of problems associated with Windows 7 (and I suspect Vista).  The new installer does not require the user to unzip the installer to a directory, then run setup.exe.  It also defaults the demodulator to the EMWIN-N signal (19200 speed).

For Windows 7 users, with UAC enabled, the EMWIN Control panel would not start or stop the Data Source or Demodulator services.  This happend because the control panel applet was not running with elevated privileges.  The new installer creates the menu option with the options necessary to launch the control panel with elevated privileges.  (WxEmwin should start it properly.)

I went ahead and included the Weather Message Software Demodulator extentions.  These extensions allow the EMWIN Software Demodulator to send status message to WxEmwin so that it can display operational information about the EMWIN Software Demodulator.

The NWS EMWIN Software Demodulator is provided free by the National Weather Service.  The repackaged installer is available on the Weather Message website.

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