The Flying Pig Rig Keyer Instructions - Dec 29, 2012 This is a very basic Keyer (ATmel AVR Assembler Source Code available) On power-Up, the keyer defaults to 15 WPM and a sidetone of 625 Hz and annunciates "OO" (without keying the XMTR) The internal timing oscillator in the Keyer Chip is an RC oscillator that runs at 9.6 MHz +/- 10 pct Factory Calibration. Typical accuracy is +/- 5 percent; The accuracy can be impoved to +/- 2 percent if one takes the time to calibrate the oscillator and reprogram the keyer chip. This procedure is too time consuming for 200 chips but may be OK for you. The accuracy is typically +/- 5 pct so your sidetone may be off by +/- 5 pct and your keying WPM may also be off. That means if you set the WPM speed to 20 WPM, you may actually have it set at 19 or 21 WPM; should not be a problem. The keyer is placed into the "Command" mode by pressing and releasing the Cmd Button. The keyer has the following commands available after pressing the Cmd Button: "E" (.) or "T" (-) Toggles between normal keyer and straight key mode, acknowleged by annunciating "S" (for Straight Key Mode) in CW. "R" (.-.) Toggles between normal and reverse paddles keys, acknowleged by annunciating "P" (for normal paddles) or "X" (for reversed paddles) in CW. The paddles (normal or reverse) are saved on power-down. "S" (...) Set keyer speed in WPM. Speed is entered as two numerical digits. After sending the "S" command, the keyer sends a DIT (e) as a prompt for the first speed character (0-4) After sending the first speed number, wait for another DIT (e) prompt and send the 2nd number (0-9) Depending upon what you enter, you will hear a "?" for ERROR or an "R" for a "Roger" acknowlegement. Valid keyer speeds are 1 to 45 WPM (good luck trying to send/use 1 WPM) The keyer speed setting is saved on power-down. "F" (..-.) Sets the sidetone frequency. After sending the "F" command, the keyer sends a DIT (e) as a prompt for the tone character (0-9) Depending upon what you enter, you will hear a "?" for ERROR or an "R" for a "Roger" acknowlegement. The sidetone frequency is saved on power-down. The following table equates the sidetone number with the sidetone frequency: 0 = 1000 Hz 1 = 833 Hz 2 = 714 Hz 3 = 625 Hz 4 = 555 Hz 5 = 500 Hz 6 = 455 Hz 7 = 417 Hz 8 = 385 Hz 9 = 357 hz To Reset the Keyer to the Default modes, hold the Cmd button active until you hear "OO" or hold the Cmd button active while when powering up the keyer until you hear "OO" Then immediately release the Command Button, else you will send another Command request. finis