On Mon, Mar 8, 2010 at 2:53 AM, w1hkj <[email protected]> wrote: > Hello Ben, > > The developers of fldigi would welcome any changes to the RTTY decoder > implementation that you would care to implement. >
What is fldigi written in? I have observed the executable is about 15 mb, so I am guessing it is written in something object-oriented... C++? Where do I learn about fldigi's development environment for Mac/OSX? Is there a package one can download, copy to a dir, and compile, or a web page somewhere that explains all of this? Once I have a source package that compiles into fldigi, I might be able to work with the RTTY code, presuming the implementation isn't over my head -- FM synthesis isn't how we used to do it, back when a 10 MHz microprocessor was "powerful." :o) > I did not know that 850 Hz shift was used by amateurs very much anymore. > I don't think it is used much (if at all) by Amateurs, however, it is used extensively for meteorological forecasts and military bulletins. Meteo forecasts are sent in the clear; military are (mostly) sent encrypted, though they are still of interest to SWL utility monitors (the same way time signals are... they tell you a lot about propagation from the callsigns and occasional headers which are sent in the clear.) > All of my monitoring of RTTY especially during contests seem to indicate > 180 Hz shift. > Is 180 Hz a European amateur standard? I have only encountered 170 Hz shifts in the amateur bands thus far. But propagation from Europe is horrible. Also, during contests is the very best time of all to go explore the SW bands. :o) --Ben AA7AS
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