K3 Modifications & Application Notes

Official Elecraft modification procedures, application notes, and technical alerts for the K3 transceiver and its option boards.

For the latest modifications and alerts, see the Elecraft Mods, Notes & Alerts page.

Audio Modifications

• AF Output Mod Rev C (912 KB)
• AF Stage Upgrade Instructions Rev B (2.0 MB)
• Audio Amplifier Protection Mod Rev B (840 KB)

ALC & Transmitter Modifications

• ALC Mod Rev B (1.2 MB)
• Risetime Application Note Rev A (412 KB)
• KSYN3 ALC Application Note Rev A (668 KB)

VFO & Synthesizer Modifications

• VFO Noise Mod Rev C (704 KB)
• KSYN3 Stiffener Mod Rev D (1.3 MB)
• KSYN3 DDS Gain Modification (684 KB)
• VFO B Knob Instructions Rev A (88 KB)

Receiver Modifications

• RX Protection Mod Rev B (300 KB)
• HACG Mod - SMD version (264 KB)
• HACG Mod - Through-hole version (464 KB)
• IF Output Buffer Gain Mod Rev A (412 KB)

Power & Interface Modifications

• 12VDC Current Modification Rev C (728 KB)
• KPA3 12V Sense Modification Rev B (340 KB)
• KIO3 RS232 and Audio RF Immunity App Note (748 KB)

Front Panel & Mechanical

• Rev B Front Panel Mod (1.3 MB)
• Front Panel Microphone Grounding App Note (1.1 MB)

KRX3 Sub Receiver Modifications

• KRX3 TMP Cable Routing Birdies Mod Rev A (612 KB)
• Installing Crystal Filters in the KRX3 Rev C (768 KB)
• Keying KRX3 SUBOUT Connector Rev A-2 (176 KB)

KXV3 Transverter Interface Modifications

• KXV3 RXA Board Installation Rev B (1.0 MB)

KREF3 Reference Oscillator

• KREF3 Output Level Modification (1.5 MB)
• K3EXREF Frequency Shift Fix (1.9 MB)

Application Notes

• Using K3 with Transverters Rev A (436 KB)
• Exploring Below AM Broadcast with a K3 (76 KB)
• 60 Meter Application Note Rev A (520 KB)

Technical Alerts

• K3 Technical Alert 1 (132 KB)