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SSTVFAX2.ZIP
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SSTVFAX2.DOC
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1992-03-30
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104 lines
WELCOME TO THE SSTV AND FAX PROGRAM SSTVFAX VERSION ON5KN_16
AUTHOR:ON5KN BBS @ON7RC-5
BELGIUM
THIS IS AN EXPERIMENTAL RECEIVE AND TRANSMIT PROGRAM WRITTEN IN
ASSEMBLER AND TO USE ON ANY IBM COMPATIBLE UNDER MSDOS
THE UPSET WAS MADE TO BE ABLE TO RECEIVE AND TRANSMIT SSTV AND
FAX WITH A MINIMUM OF ADDITIONAL EXTERNAL HARDWARE
FOR RECEPTION OF BOTH MODES YOU ONLY NEED A SIMPLE 741-IC
TRANSMITTING TAKES PLACE VIA A LM324 AND A XR2206
BOTH TRANSMIT AND RECEIVE HARDWARE ARE POWERSUPPLIED BY
THE RS232 FROM THE PC
THE SCHEMATICS ARE ADDED IN THE FILE SSTVFAX2.SCH WICH YOU
SIMPLY CAN PRINT UNDER MSDOS ON A GRAPHICS PRINTER
USAGE: COPY SSTVFAX2.SCH PRN /B
BE SURE TO MAKE THE CORRECT ADJUSTMENTS FOR THE TX-MODULE
SYNCPULSES MUST BE 1200HZ
FULL WHITE MUST BE BELOW OR EQUAL TO 2300HZ
TO OBTAIN FULL WHITE SCREEN USE:
IN RX-MODE CLEAR SCREEN TO BLACK WITH C,E OR V
BRING TO KEY-MODE WITH K
INVERT FULL BLACK SCREEN TO FULL WHITE WITH I
SOME DYNAMIC ADJUSTMENT MAY BE NECESSARY TO FINE-ADJUST THE
1200HZ PULSES (TRY ON A BLANK SCREEN)
A 4-LEVEL GREYSCALE IS AUTOMATED ON BOTTOM OF EACH PICTURE
SSTV CAN BE RECEIVED FROM ALL ACTUAL PRESENT MODES HOWEVER
THE IMAGES WILL BE DISPLAYED IN GREY-LEVELS EVEN FOR COLOUR
SENDED PICTURES
TRANSMISSION OF SSTV IS POSSIBLE IN 16 GREY-LEVELS AND IN
FOUR STANDARD MODES 8SEC, 16SEC, 32SEC,(NORMAL) AND 64SEC
(IN DOUBLE MODE)
FAX WILL BE RECEIVED IN 120 OR 90 LPM
TRANSMISSION OF FAX WILL ALSO BE IN 120 OR 90 LPM AND AN
OPTION PERMITS TO SEND EACH LINE TWICE (DOUBLE MODE)
THE RECEPTION SCREEN CAN BE ONE OF THE CURRENT MODES EXCEPT
S-VGA WICH IS NOT YET SUPPORTED
SOME VIDEO CARDS MAY NOT BE COMPATIBLE
IN SSTV BEST SYNC WILL BE OBTAINED WHEN RIGHT BOTTOM OF IMAGE
IS POINTED WITH RIGHT MOUSE BUTTON
START POINT OF IMAGE ON SCREEN CAN BE REDEFINED WITH MOUSE-
POINTING AND LEFT MOUSE BUTTON
ON SOME MODES OF COLOUR SSTV IT MAY BE INTERESTING TO USE
DOUBLE COMPACTATION AND OR POINT RIGHT BOTTOM SYNCRO POINT
AT END OF SCREEN
ON RECEPTION OF 96 SEC OR MORE IMAGES USE OF "U" TO DISABLE
VERTICAL SYNC UNTIL NEXT "T" AVOID SPURIOUS SYNC BY QRM
AS TIMING IS CRITICAL ON SUCH AN APPLICATION THE POSSIBILITIES
ARE FUNCTION OF THE SPEED OF YOUR PC AND TYPE OF SCREEN
THE PROGRAM WAS WRITTEN ON AT 286/12MC 640K VGA
MAINLY CGA AND HERCULES MODES ARE NOT FULLY QUALIFIED BUT
CAN GIVE ACCEPTABLE RESULTS IN RECEPTION
A XT PC/4.7MC WILL NOT RESPECT THE TIMING STANDARDS IN TRANSMISSION
ANOTHER FEATURE WICH EXPANDS THE POSSIBILITIES IS A STANDARD
MOUSE WITH MOUSE-DRIVER
THE PICTURES CAN BE STORED ON DISK AND VIDPIC.COM ALLOWS YOU
TO PICK SCREENS FROM OTHER APPLICATIONS
IF YOUR SYSTEM IS EQUIPED WITH A HAND-SCANNER YOU ARE ABLE
TO CREATE YOUR OWN PICTURES AND PROCESS THEM WITHIN SSTVFAX
MAKING SLOWSCAN AND FAX ON A REAL LOW-BUDGET WICH WAS THE
MAIN TARGET OF THIS PACKAGE AND TO BRING THESE MODES OF
RECEPTION AND TRANSMISSION AS A SIMPLE ADD TO THE BECOMING
COMMON-USE-PC IN THE RADIO-AMATEUR WORLD
TRY FIRST THE RECEPTION MODULE !
IT IS EASY AND YOU WILL SEE THE ACTIVITIES ON HF AND VHF
NEAR 14.230KHZ YOU ARE SURE TO SEE THEM FIRST
ENJOY THIS FREE SOFTWARE PACKAGE AND LET ME KNOW WHAT YOU
ARE THINKING ABOUT AND GIVE SOME SUGGESTIONS
MAKE REFERENCE TO SSTVFAX2
IF YOU MAKE A COPY FOR FURTHER DISTRIBUTION PLEASE LEAVE IT
IN THE SELF-EXPLODING FORM SSTVFAX2.COM OR AT LEAST BE SURE
THAT IT INCLUDES SSTVFAX2.TXT/SSTVFAX2.SCH/SSTVFAX.EXE/VIDPIC.COM
AND THIS SSTVFAX2.DOC FILES
LAST REMARK ... YOUR TIMER MAY BE DISTURBED AFTER RUNNING
SSTVFAX JUST TILL ANOTHER START-UP OF YOUR PC
HAVE A LOT OF FUN AND SEE YOU SOON ON THE BANDS
73 ON5KN BBS @ON7RC-5 BELGIUM