PK-4
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Ham Radio KITS
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PK-4 Troubleshooting guide
Symptom: a PK-4 chip is plugged into a PK-3 or PK-Basic keyer socket, after powerup FB is heard, then the keyer sends a continuous stream of BE
Solution: add a 10 k ohm pullup resistor from pin 1 to pin 4 of the keyer socket.