Connect and select
Use a stereo KEY plug and set INP correctly.
Radio guides / Elecraft / K2
CW599 ORIGINAL OPERATING WORKFLOW
K2CW Operating Guide
Elecraft still offers the K2 kit. This guide covers the K2 operating controls after assembly and alignment, with options identified explicitly; it does not treat retired K2/100 upgrade hardware as a currently available base configuration.
K2CW operating workflow
English Owner’s Manual Rev I (29 March 2012), for serial numbers 4060 and above with Revision B PCB; errata I-8 (13 June 2018). Checked 2026-09-25. Applies after kit assembly and alignment, using original firmware; older hardware and fitted options need their own documentation. References use printed page numbers. The errata covers construction changes, not a new CW operating menu.
START HERE
A five-step CW setup routine
Use this order as an operating checklist, not as a replacement for the radio manual. Controls and available options can vary by firmware and region.
Check the test setup
Hold VOX until TEST appears and C flashes.
Set rhythm and tone
Set KEYER speed, ST L and ST P.
Tune one signal
Use SPOT and then XFIL to isolate the desired note.
Send and listen
Return to OPER only after checking frequency, antenna and output power.
MODEL SETTINGS INDEX
CW settings, paths, and starting points
Tap MENU and turn VFO to select an entry, hold EDIT to change its value, then tap MENU to leave editing and again to exit. Search settings or paths below. Manufacturer recommendations and CW599 advice are labeled; examples are not defaults.
Keyer
Use a stereo KEY plug
- Access path
MENU > INP- Options or range
- HAND / PDLn / PDLr
- Factory value / operating start
- CW599: check each contact in TEST; the tone should stop when released.
CW599 note: A hand key or external keyer uses HAND and the tip contact. Use a stereo plug even for a hand key; the ring is a paddle contact and must not be accidentally grounded. For paddles, PDLn uses tip for dots and ring for dashes; PDLr reverses them.
Keyer
Enter TEST before practice
- Access path
Hold VOX > TEST- Options or range
- TEST / OPER
- Factory value / operating start
- CW599: use TEST before key adjustments and message rehearsal.
CW599 note: Confirm TEST and the flashing C mode letter before adjusting a key. Hold VOX again only when ready to return to normal operation.
Keyer
Set the internal keyer speed
- Access path
KEYER- Options or range
- Approximately 9–50 WPM
- Factory value / operating start
- CW599: use a speed you can comfortably copy and send.
CW599 note: Turn KEYER and send a short word in TEST. Read the WPM display and keep clear spaces before deciding to increase speed.
Keyer
Choose the squeeze-key response
- Access path
MENU > IAB- Options or range
- A / B
- Factory value / operating start
- Manufacturer recommendation: start with A if unsure; its release timing is less critical. This is not a stated default.
CW599 note: Use the iambic mode familiar from your other keyer. Test a squeeze-and-release sequence; extra final elements usually indicate a mode or release-timing mismatch.
Receive
Set level separately from pitch
- Access path
MENU > ST L / ST P- Options or range
- ST L: 0–255; ST P: 400–800 Hz in 10 Hz steps
- Factory value / operating start
- Manufacturer recommendation: 500–600 Hz. CW599: moderate volume. Neither is a stated default.
CW599 note: Adjust in TEST; AF GAIN does not set sidetone volume. Changing ST P also changes the CW receive offset; check the received note after leaving the menu. The crystal-filter BFO positions are not automatically optimized: if the signal weakens after a pitch change, follow the CAL FIL alignment procedure rather than guessing values.
Manual reference: K2 Owner’s Manual Rev I, pp. 47, 77, 89, 100–101
Receive
Work through fitted filters
- Access path
XFIL; AFIL- Options or range
- FL1–FL4; AFIL requires KAF2 / KDSP2
- Factory value / operating start
- CW599: tune first, then narrow in stages while checking readability.
CW599 note: Begin with a wider XFIL choice and narrow after tuning. AFIL requires its option; do not assume an uninstalled module is a hidden software setting. Hold XFIL + AGC together to inspect the filter number and bandwidth; alignment/customization changes the actual presets.
Receive
Match SPOT before trying CW reverse
- Access path
Hold SPOT; hold CW RV- Options or range
- Pitch matching; CW Normal / Reverse
- Factory value / operating start
- CW599: turn off RIT, XIT and SPLIT for a normal same-frequency contact.
CW599 note: Hold SPOT and tune the VFO until the received note matches the reference; tap a switch to end it. Then hold CW RV to try the opposite sideband against interference; a bar above C indicates reverse. Compare the wanted signal and interferer. A large pitch jump calls for another SPOT check. SPOT does not display received text.
Break-in
Adjust key-up recovery
- Access path
MENU > T-R- Options or range
- 0.00–2.55 seconds
- Factory value / operating start
- Manufacturer casual-operation suggestion: about 0.05 s, not a default. The menu table specifies 2.55 s; the CW narrative rounds this to 2.5 s.
CW599 note: Try a short delay for relaxed operating, then compare faster recovery while listening with your normal headphones. A zero setting is the fastest, not an accuracy setting for Morse timing.
Memory / PC
Rehearse message buffers
- Access path
Hold REC > 0–8; MSG ends recording; MSG > 0–8 plays- Options or range
- Nine buffers (0–8), 250 bytes each
- Factory value / operating start
- CW599: record a short call, then rehearse playback and stopping in TEST.
CW599 note: Recording requires a paddle plugged directly into the K2 and INP set to PDLn/PDLr. Hold REC, tap a buffer number, send the message, then tap MSG to finish. Tapping MSG before sending preserves the old contents. Tap MSG then tap the number for one playback; MSG or a paddle tap cancels it. Verify callsign and spacing before returning to OPER.
Memory / PC
Leave a reply gap in repeated calls
- Access path
MENU > RPT; tap MSG, then hold 0–8- Options or range
- 0–255 seconds; hold the buffer number to repeat
- Factory value / operating start
- CW599: allow time for a reply and rehearse stopping in TEST.
CW599 note: RPT sets the pause between messages. The buffer number flashes at the end of each repeated transmission; MSG or the key/paddle stops it. A tap selects one playback; a hold selects repeat. FPLY is a separate shortcut: enabling it takes over the selected buttons’ tap functions in CW mode.
No matching settings. Try a shorter search or clear the search and category.
CW599 RECOMMENDATIONS
Three operating starting points
These are original operator-oriented starting points. They are not factory presets and intentionally avoid claiming model-specific default values.
First contact
Check one change at a time.
- Keying: Match the actual key and verify clean spacing
- Transmit: Check the documented RF-off or dummy-load setup first
- Receive: Use a comfortable tone and moderate volume
Difficult reception
Keep the wanted signal audible.
- Tuning: Center the wanted note before narrowing
- Filter: Compare changes at a similar audio level
- Copying: Ask for a repeat when a callsign remains uncertain
Repeated calls
Leave a clear path back to receiving.
- Sending: Verify any supported message and its stop action
- Listening: Leave time for an answer
- Station: Confirm frequency, power and transmit recovery
Questions and troubleshooting
Does it decode received CW?
The checked documentation does not provide a built-in received-CW text workflow for K2. SPOT is a pitch-matching aid, not a text decoder.
Why does AFIL do nothing?
The audio filter requires its optional module. Check fitted hardware before troubleshooting a menu.
Why does a hand-key cable cause continuous keying?
Check the required stereo plug and INP HAND configuration; an unintended ring-to-ground connection can trigger the paddle input.
Official model resource
Use the manufacturer-controlled product and support pages to verify your region, firmware, menus, connector wiring, operating limits, and safety information. CW599 does not host, mirror, or reproduce the manual.
Independent CW599 operating guide. Product names and trademarks belong to their respective owners. This page contains original workflow advice, not manufacturer instructions or an official endorsement.
Search and filters run locally in your browser and do not connect to a radio. Version 1.0 (2026-09-25): bilingual guide and sourced product photo. Revisions are retained in site Git and release backups; no separate archived page.