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CODING IS APPLIED TO CREATE THE FSQ SIGNAL.  STEVE OLNEY, VK2XV, PIONEERED
THIS TECHNIQUE, AND THE FSQ DEVELOPERS HAD ALSO IMPLEMENTED IT IN DOMINOEX,
EXCHAT, AND WSQ.  IT IS ALSO USED IN THOR.  IFK ENCODES THE DATA FROM THE
CHARACTER TABLE AS DIFFERENCES BETWEEN TWO TONES RATHER THAN AS AN ABSOLUTE
TONE.  IFK PROVIDES TOLERANCE OF TUNING 50 HZ, AND OF DRIFT 18 HZ/S AT 6
BAUD, AND HAS EXCELLENT ISI PERFORMANCE.  ISI OCCURS WHEN SIGNAL COPIES
ARRIVE AT THE RECEIVER VIA DIFFERENT PAT

MODEL, AND INTRODUCE HAMS TO VERY SIMPLE CHAT OPERATION, NOT UNLIKE CELL
PHONE TEXTING OR INTERNET CHAT.  SEE THE LIST OF FSQ CALLING FREQUENCIES IN
TABLE 1.  COMPLEX VS. SIMPLE  IN RECENT YEARS, DIGITAL MODES HAVE BECOME
INCREASINGLY COMPLEX.  HAM RADIO SHOULD BE ABOUT FRIENDS CHATTING WITH EASY
TO USE EQUIPMENT, NOT FIGHTING WITH THE TECHNOLOGY, OR STRUGGLING TO
UNDERSTAND IT.  WHILE SOME RECENT COMPLEX MODES MAY BE TECHNICALLY
EXCELLENT, THAT EXCELLENCE COMES AT THE COST OF COMPLEXITY AND OPERATIONAL
PLEASURE THEY ARE NOT CONVERSATIONAL MODES.  THEY CAN BE VERY SLUGGISH
CAUSE DELAY, AND CAN REQUIRE MORE BANDWIDTH AND HIGHER SYMBOL RATES THAT
FURTHER ADD TO COMPLEXITY AND TO PROBLEMS ON HF PATHS.  FOR CHATTING, WE
NEED A VERY SLICK MODE, WITH NO ERROR CORRECTION OR OTHER DELAYS.  WE
DELIBERATELY EXPLOITED ROBUSTNESS THROUGH SIMPLICITY IN FSQ.  WE ELECTED TO
USE AN MFSK MULTI FREQUENCY SHIFT KEYING SYSTEM OF 33 TONES, OPERATING AT A
MAXIMUM OF NEARLY 6 BAUD, THAT PROVIDES NEARLY 60 WORDS PER MINUTE
THROUGHPUT.  OVERALL SIGNAL BANDWIDTH IS 300 HZ, BUT THE FILTER BANDWIDTH
PER TONE IS ONLY ABOUT 3 HZ, HENCE IT HAS EXCELLENT SENSITIVITY.  THE NEW

FSQ FAST SIMPLE QSO  THIS NEW DIGITAL CHAT MODE INCLUDES A RICH SET OF
FEATURES FOR PUBLIC SERVICE COMMUNICATIONS.  MURRAY GREENMAN, ZL1BPU FSQ
FAST SIMPLE QSO IS A NEW TYPE OF DIGITAL MODE THAT IS KEYBOARD CHAT
ORIENTED AND SUPPORTS A GOOD TYPING SPEED.  IT HAS A LOW ERROR RATE, IS
HIGHLY VERSATILE, AND SUPPORTS IMAGE TRANSMISSION AND SELECTIVE CALLING
WITH A WIDE RANGE OF COMMANDS.  FSQ WAS DESIGNED FOR SIMPLE, ENJOYABLE CHAT
OPERATION, BUT WITH PUBLIC SERVICE AND DISASTER COMMUNICATIONS OPERATIONS
IN MIND.  OTHER THAN A TRANSCEIVER, ALL YOU NEED IS A SOUND DEVICE
INTERFACE.  INTRODUCING FSQ CON WASSILIEFF, ZL2AFP, AND MURRAY GREENMAN,
ZL1BPU, DESIGNED AND DEVELOPED FSQ FOR SHORT DISTANCE, SINGLE HOP NVIS NEAR
VERTICAL INCIDENCE SKYWAVE IONOSPHERIC PROPAGATION, WHICH IS TYPICAL OF LOW
BANDS, 1R8 10 MHZ, BUT IT IS ALSO USEFUL ON LONGER SINGLE HOP GREYLINE
PATHS, AND ON VHF FM.  THE MAIN CHALLENGE WAS TO ACHIEVE WORLD CLASS
PERFORMANCE UNDER CONDITIONS OF FADING, MULTI PATH RECEPTION, DOPPLER
SHIFT, AND SIGNIFICANT IMPULSE INTERFERENCE, WITHOUT USING ERROR
CORRECTION.  LONG LATENCIES AND SLOW TURNAROUND PRINCIPALLY CAUSED BY ERROR
CORRECTION CODING ENCOURAGE BAD OPERATING HABITS SUCH AS LONG
TRANSMISSIONS, ONE SIDED QSOS, AND QSO BY MACRO.  WE DECIDED THAT IT WAS
TIME FOR A NEW MODE THAT WOULD DEPART FROM THE CONVENTIONAL DIGITAL MODE
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