General description
SkySweeper HF FAX decoder uses the most modern digital PLL synchronization technology. The received image can be saved with ‘Save’. ‘Reset’ resets the decoder and ‘Config’ is used to set HF FAX parameters. SkySweeper HF FAX assumes that the carrier is 1.9 kHz below the FAX transmission. So in the USB mode, if you are given the carrier frequency of the HF FAX transmission, then just set your HF receiver to that frequency.
Configuration
Pressing the Config button opens the following configuration dialog.
Parameters
LPM
The switch selects how many lines per minute are sent.
IOC
The switch selects the IOC value (Index of Co-operation).
Sync in use
If the sync in use is checked, the SkySweeper synchronizes to the start of the picture. If sync is not selected, decoding is started immediately.
Scroll
If the scroll checkbox is selected, a picture is scrolled from bottom to up. Otherwise drawing is started at the top and re-started at the top when the picture area is full.
Grey Scale
If this parameter is selected, then FAX picture is shown as a grey scale picture. Otherwise (as default) it is shown as a black & white picture.
Post Processing Functions
Post processing functions can be used to correct properties of the picture after receiving. The post processing functions are not enabled during receiving.
Start
If the picture is shifted in horizontally, the start slider can be used to set the left margin in the correct place.
Sampling
If the picture is slanted, the sampling slider is used to correct the slanting.
Intensity
The intensity of the picture can be changed with the intensity slider.
Contrast
The contrast of the picture can be changed with the contrast slider.
Save
The save button saves received picture into file as bitmap format.
Reset
The reset button resets the decoder and clears the window.
