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
Section titled “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
Section titled “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
Section titled “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
Section titled “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
Section titled “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
Section titled “Front Panel & Mechanical”- Rev B Front Panel Mod (1.3 MB)
- Front Panel Microphone Grounding App Note (1.1 MB)
KRX3 Sub Receiver Modifications
Section titled “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
Section titled “KXV3 Transverter Interface Modifications”- KXV3 RXA Board Installation Rev B (1.0 MB)
KREF3 Reference Oscillator
Section titled “KREF3 Reference Oscillator”- KREF3 Output Level Modification (1.5 MB)
- K3EXREF Frequency Shift Fix (1.9 MB)
Application Notes
Section titled “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
Section titled “Technical Alerts”- K3 Technical Alert 1 (132 KB)