The PK-4 keyer kit - 10/28/2004
The PK-4 kit has been replaced by the PK4 SSR kit.
The PK-4 is fully pin compatible
with the Norcal keyer.
The PK-4 is pin compatible
with the PK-3, PK-2 and PK-Basic (Tick and K8 chips, too) with the addition of a 10k ohm pullup resistor
between pin 1 and 4 of the keyer chip socket. The PK-4 shares the pot speed
control of the previous PK series and the Norcal keyer but it has a large number of new additional
features. Here are a few highlights:
![[PK-4 board picture]](pk4.jpg)
pot or paddle speed control, 5 to 50 WPM
two 80 character memories plus an 80 character callsign memory
OR optionally two 80 and two 40 character memories
memories & settings retained without power (EEPROM)
Ultimatic or Iambic A or B keying modes
beacon mode, variable delay, up to 60 seconds
adjustable element weighting
variable sidetone frequency
low standby power (about 7 ua at 5 V, with regulator)
small size (1 by 1.5 inches)
View the
manual ,
schematic and
hookup diagram
for more information on
the kit.
Downloadable files for the PK-4
The Acrobat files of complex diagrams (like the PK-4 schematic) may not
view well on your computer screen - suggestion: use the magnifier to zoom in
for better detail or print out the file.
pk4.pdf (53k) - PK-4 schematic
pk4e.pdf (54k) - PK-4 manual in Acrobat format
pk4hu.pdf (28k) - PK-4 Hookup diagram in Acrobat format
pk4ts.htm (1k) - PK-4 Troubleshooting guide
pk4menus.pdf (11k) - a PK-4 menu "cheat sheet" by Chuck Carpenter, W5USJ (thanks, Chuck)
stalkin.pdf (16k) - Stalking the Wild Multipress! - an Acrobat file
of a hardware method to solve the problem of pressing 2 or 3 switches at the same time.
modeab.pdf (8k) - an Acrobat file explaning the differences between Iambic mode A and B
ultimat.txt (4k) - a text file on the Ultimatic mode
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