Connect and select
Choose the correct KEY input and iambic settings.
Radio guides / Expert Electronics / SunSDR2DX/PRO
CW599 ORIGINAL OPERATING WORKFLOW
SunSDR2DX/PROCW Operating Guide
SunSDR2DX and SunSDR2PRO share ExpertSDR3 operating concepts, while their RF hardware and output specifications differ. This guide covers the desktop software’s CW controls and identifies local monitoring and remote macros separately; the product photograph shows SunSDR2DX.
SunSDR2DX/PROCW operating workflow
English ExpertSDR3 manual v1.3.2, September 2026; DX/PRO hardware documentation remains separate. Checked 2026-10-07; original firmware; printed manual pages unless marked PDF.
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
Check the station with a dummy load and controlled output.
Set rhythm and tone
Set Speed, Pitch and the local monitor path.
Tune one signal
Tune one signal and narrow the passband gradually.
Send and listen
Confirm SPLIT and both VFOs, then send once and listen.
MODEL SETTINGS INDEX
CW settings, paths, and starting points
Search by setting or menu path. Manufacturer defaults and recommendations are labeled separately from CW599 advice; references identify the checked manual or software version.
Keyer
Select internal paddle behavior
- Access path
Break.In > right-click CW settings > Iambic / Type B / Reverse- Options or range
- Straight key or iambic paddle; contact reversal
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: Use the settings for the connected KEY input and check separate elements. Reverse swaps dot/dash contacts; Type B changes squeeze release behavior. Change one at a time and listen to a short test.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Keyer
Separate paddle speed from macro speed
- Access path
CW settings > Speed / Macros Speed- Options or range
- Internal keyer speed; TCI macro speed
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: Speed controls the paddle keyer while Macros Speed applies to macro transmission. If a stored call sounds different from your hand sending, compare both controls rather than changing character weighting.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Break-in
Enable automatic CW transmit deliberately
- Access path
Break.In; CW settings > Break In- Options or range
- Automatic keying and TX-to-RX recovery delay
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: Break.In enables automatic transmission from the key. Set the receive recovery delay for the intended listening rhythm and verify RF into a dummy load before normal antenna operation.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Break-in
Allow external hardware to settle
- Access path
CW settings > PTT-CW delay / Macros Delay- Options or range
- RX-to-TX delays for RF and macros
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: PTT-CW delay affects RF timing, not the local monitor tone. Follow the amplifier’s switching requirements and compare received keying with a separate monitor; a clean sidetone alone does not prove clean RF timing.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Receive
Keep pitch and tuning consistent
- Access path
CW settings > Pitch; receive filter- Options or range
- CW reference tone and receive passband
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: Choose a comfortable pitch, tune the wanted signal to it, then narrow the receive passband. The documented CW engine uses CW-U; do not copy another radio’s lower-sideband assumption.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Receive
Keep the key and monitor together
- Access path
Radio KEY/headphones or E-Coder2 KEY/headphones- Options or range
- Direct local keying monitor
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: For the documented lowest-latency path, connect the key and headphones to the same device. Network audio delay can disturb paddle timing; test the actual remote connection before a contact.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
Memory / PC
Confirm VFO A receive and VFO B transmit
- Access path
SPLIT; right-click Shift- Options or range
- Split toggle; per-mode transmit offset
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: SPLIT assigns receive to A and transmit to B; switching it off returns transmission to A. Read both VFOs and the mode-specific shift before calling a split DX station.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
System / power
Match ExpertSDR3 and radio firmware
- Access path
ExpertSDR3 release package and radio firmware update- Options or range
- ExpertSDR3 CW core and compatible firmware
- Factory value / operating start
- CW599: change only after the listening or keying check below.
CW599 note: Use the manufacturer’s matching software/firmware release. The revised CW core and firmware-played macros are not an instruction set for ExpertSDR2. After an update, recheck keying, audio routing and one macro.
Manual reference: ExpertSDR3 User Manual v1.3.2, pp. 83–84, 190–191 (PDF)
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 SunSDR2DX/PRO. The manual’s CW Skimmer integration refers to separate software, not an on-radio text decoder.
Why is my sidetone delayed remotely?
Network audio adds delay. Use the documented key/headphone connection on the same radio or E-Coder2 and test the complete path.
Can DX power settings be copied to PRO?
No. Shared software does not make the power amplifiers identical. Follow the hardware manual for the actual model.
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 (2026-10-07): four-language guide and sourced product photo. Revisions are retained in site Git and release backups; no separate archived page.