PK-4 feature list:
pot or paddle speed control - 5 to 50 WPM speed range
speed readout via mem+dit simulpress
2, 3 or 4 memories, non-volatile (contents retained when power off)
memory embedded pause, callsign memory insertion
weight adjustable via menu item
tone frequency adjustable via menu item
1 x 1.5 inch circuit board
machined pin IC socket
beacon mode including timed beacon delay
separate command sidetone frequency (lower - non adjustable)
bug mode (dit paddle normal, dah paddle functions as straight key)
straight key input via bug mode or via paddle simulpress with diodes
tune function via menu
5 didah tune mode
or single paddle 10 dahs/dits tune mode
Ultimatic keying mode
selectable Iambic keying modes A or B
two selectable varieties of mode b: Accu Keyer / CMOS Super keyer
dit / dah memories can be turned off
selectable live "on the air" recording of memories
paddles can be reversed via menu item
autospace on/off selectable
stuck paddle protection (puts keyer to sleep after 128 consecutive dits/dahs)
tune mode timeout after 14 seconds
low power, about 7 ua w/regulator while keyer is asleep, 3 ma or less active @ 5V
Flash PIC processor, code is easily updatable
bail from menu with a PAR (press and release) of mem + dit + dah
Single lever paddle compatible, "both" paddle features are accessable with
an in turn press of dit then dah or dah then dit
power up bypass straight key mode
selectable two or one second press and hold delay time
embedded "pause and go", keyer will pause for operator sent code, then
automatically resume playing the message after a word space
"backspace" while recording, if a mistake is sent, the operator can
back up one character in memory with a mem+dit PAR (press and release)
and MORE, see the manual