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ACfax - amateur FAX receiving software for Linux / X11
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Andreas Czechanowski, DL4SDC
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andreas.czechanowski@ins.uni-stuttgart.de
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!!! THIS PROGRAM IS PROVIDED "AS IS" WITHOUT ANY WARRANTY !!!
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USE AT YOUR OWN RISK ! IT IS STILL UNDER DEVELOPMENT !
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Five steps to success....:
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* Edit the Imakefile, and look for the DEFINES after the description.
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You normally should not have to edit much here.
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If you do not have libXaw3d, remove -DUSE_XAW3D from the DEFINES
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and change -lXaw3d to -lXaw in the LOCAL_LIBRARIES line.
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If you have only a normal SoundBlaster/Pro (without software
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controllable mixer), remove -DSBL_16 also from the DEFINES line.
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(if this fails, and you don't get it fixed, you may mail me the
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output of the make command - but don't expect a 24-minute instant
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* Be sure to have /dev/dsp (and /dev/mixer for SoundBlaster 16)
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readable and writable for the user that wants to execute acfax !
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* now, type "./acfax" and don't be surprised about weird messages
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appearing on your terminal screen from which acfax was started
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- it may be only useful for me while debugging. Just ignore it.
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NOTES / BUGS / BEFORE YOU ASK:
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- The "Signal" scrollbar in the Modem-part of the ACFax-control-window
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indicates the audio signal level. With the SoundBlaster 16, the
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LINE IN is selected as audio input. For the "FM" Modem type,
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levels of 25% can even be okay, optimum would be 50% to 80%,
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and if it is at maximum then the signal is probably too loud !
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When using the AM modem, the audio level is directly proportional
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to the image contrast. You probably have to experimentally
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find out how to set the audio volume.
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You may change the input sensitivity (SoundBlaster 16 only) by
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setting "linevol = nn;" on line 64 of the file sblaster.c ,
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whereas nn=99 is the maximum.
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- When receiving on longwave/shortwave, set the Modem to "FM" mode,
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the receiver/transceiver to USB or LSB, and the AGC to fast (this
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compensates best for signal fading).
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If you want to receive Meteosat, you have to use an FM receiver
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with not too narrow IF filters and the "AM" Modem type.
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If this seems confusing or unlogical to you, be aware that
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AM/FM means the operation of the Modem, so either varying
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tone-pitch or varying loudness determines the luminosity of
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the beam writing the image lines.
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- You may switch reception manually on and off using the "STOP" and
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"RUN" buttons in the operation control. If you want the image
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to be written from the beginning, switch to "SYN" once,
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and then back to "RUN". This will reset the internal writing
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pointer to the beginning.
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