FreeDV RADE Net Night: Audio-Level, Rig-Control, and Fallback Tests Before You Call CQ

Why RADE Net Night Needs a Preflight

FreeDV RADE is attracting attention because it gives HF operators another way to explore digital voice when SSB is noisy, weak, or tiring to copy. The interest is real enough that amateur-radio organizations have been discussing whether RADE could become a mainstream HF voice option, including ARRL’s article “Will RADE Be the Next SSB?” and WIA coverage of growing RADE activity at wia.org.au.

That attention also means more operators will arrive at a net with new software, unproven audio routing, and unfamiliar rig control. A good FreeDV RADE setup is not just “install the program and transmit.” It is a chain: microphone, computer audio, FreeDV, CAT/PTT control, radio audio input, RF output, receive audio, decoding, and an agreed fallback if something fails.

FreeDV 2.4.1 was released in late October 2026, and the project notes audio, rig-control, and stability fixes in the release announcement at freedv.org. That makes this a good time to check the basics before calling CQ on a RADE net.

The Goal: Clean Digital Voice, Not Maximum Loudness

HF digital voice is less forgiving of sloppy audio than casual SSB ragchewing. If the transmit path is overdriven, compressed, clipped, or routed through the wrong sound device, the receiving station may hear nothing useful even though your RF signal looks strong. The goal is a clean, linear path from the software to the transmitter, with enough drive to produce proper RF output but not enough to trigger heavy ALC action or distortion.

Start by thinking of RADE as a mode that needs disciplined audio levels. Your transceiver, sound interface, and operating system all have gain controls. If any one stage is too hot, you can create distortion that no amount of RF power will repair. If any stage is too low, the transmitter may produce little output or the decoder at the far end may struggle.

Before Net Night: Update and Confirm the Basics

Do not use a scheduled net as your first installation test. Install or update FreeDV early enough that you can solve driver, device, and permission problems without tying up the frequency. The FreeDV user manual is maintained at github.com/freedv/freedv-gui and should be your first reference for current controls, supported modes, and rig-control behavior.

Confirm the version: Use a current FreeDV build appropriate for your operating system.
Select the correct mode: Choose RADE only if that is the mode announced for the net or test.
Check audio devices: Identify the microphone input, speaker output, radio receive input, and radio transmit output by name.
Disable audio “enhancements”: Operating-system noise suppression, echo cancellation, automatic gain, and virtual surround processing can damage digital-mode audio.
Back up a working configuration: If you already have a stable FreeDV setup, note the settings before experimenting.

Audio-Level Preflight

Receive Audio

On receive, your radio audio must reach FreeDV at a usable level without clipping. If the signal is too low, decoding may be intermittent. If the audio input clips, the waveform is damaged before the decoder sees it. Use your interface and FreeDV level indicators as your primary guide rather than guessing by speaker volume.

Set the radio to the mode and filter width recommended for the net or the FreeDV documentation.
Turn off receive audio processing that reshapes the passband unless the manual or experienced net control recommends it.
Use moderate RF gain and AGC settings. Extreme AGC pumping can make weak-signal decoding harder.
Keep the computer input level comfortably below clipping during strong received signals.

If you are using a radio with a USB audio codec, remember that the front-panel speaker volume may not control the USB audio level. Many radios have separate menu items for USB audio output and input. Those menus are easy to overlook.

Transmit Audio

Transmit audio is where most net-night trouble starts. For digital voice, you usually want the transceiver to behave like a clean linear transmitter, not like a processed SSB voice station. Speech compression, transmit equalizers, aggressive noise reduction, and high microphone gain can all be wrong tools in this context.

Use the radio’s DATA, USB-D, or equivalent mode if that is the correct choice for your transceiver and setup.
Turn speech processing or compression off unless the FreeDV documentation for your exact path says otherwise.
Start with low audio drive and increase gradually.
Watch ALC. A little indication may be normal on some radios, but heavy ALC action is a warning sign.
Use a dummy load for initial RF output checks when possible.

A practical method is to set RF power lower than your final operating level, key the transmitter briefly into a dummy load, and raise the software or interface transmit level until the radio produces expected power without obvious overdrive. If you must test on the air, use an open frequency, identify properly, keep transmissions short, and avoid interfering with ongoing QSOs.

Rig-Control and PTT Checks

CAT control is convenient, but it is another failure point. A FreeDV RADE setup can fail because the software cannot read the VFO, cannot key PTT, keys the wrong radio, or keys through VOX when you expected CAT PTT. Before a net, verify control deliberately.

Read test: Confirm FreeDV can read the radio’s frequency and mode if you have enabled CAT.
Change test: If you allow software frequency control, make a small, harmless change and confirm the radio follows.
PTT test: Verify whether PTT is controlled by CAT, serial RTS/DTR, a sound-card interface, or VOX.
Fail-safe test: Know how to stop transmit immediately if the software hangs or the PTT line sticks.
Port check: Make sure logging software, rig-control utilities, and FreeDV are not fighting for the same serial port.

VOX can work in some stations, but it can also cause clipped syllables, accidental transmissions, and confusing behavior when computer alert sounds leak into the transmit path. For net operation, a positive PTT method is usually easier to manage.

Frequency, Band Plan, and Operating Discipline

Net announcements may specify a dial frequency, mode, offset, or calling procedure. Treat those details as time-sensitive. Do not assume a frequency from an old forum post is still correct. Stay within your license privileges, the applicable band segment, and current rules. In the United States, consult FCC Part 97 and current band-plan guidance; outside the United States, follow your regulator and local amateur-radio practice.

Digital voice does not remove ordinary amateur obligations. Identify as required. Avoid transmitting over existing activity. Leave enough spacing for the occupied bandwidth of the mode being used. If the net control station asks for short calls, give a short call. If they ask stations to call by call-area, follow that structure.

A Simple Net-Night Workflow

Use this sequence 20 to 30 minutes before the net, not after net control starts taking check-ins.

1. Launch FreeDV: Confirm the expected audio devices and RADE mode are selected.
2. Verify receive: Tune to a known signal or the net frequency and watch for sane levels.
3. Confirm radio mode: Use the filter, sideband, and data setting appropriate for your radio and the net instructions.
4. Test CAT: Confirm frequency readout and PTT behavior.
5. Check RF output: Use low power first. Watch power, ALC, SWR, and temperature.
6. Prepare identification: Be ready to give your call clearly by voice or as directed by the net.
7. Listen first: Copy the flow of the net before transmitting.
8. Call briefly: Use your call sign and avoid long explanations until acknowledged.

Build a Fallback Plan Before You Need It

A fallback plan is not pessimism. It is good net procedure. Digital voice nets can be affected by software crashes, bad levels, incorrect mode selection, QRM, fading, and simple misunderstanding. Decide in advance how you will recover.

SSB fallback: Know whether the group uses USB/LSB voice on the same dial frequency, a nearby coordination frequency, or another announced channel.
Time fallback: Agree to return to analog voice at a specific minute if digital check-in fails.
Messaging fallback: If the group uses an email list, reflector, chat, or web page for coordination, have it open before the net.
Station fallback: If CAT fails, know how to key manually and tune the radio without software control.
Audio fallback: Keep a saved profile for your last known good non-RADE FreeDV mode or analog SSB settings.

The most important fallback is procedural clarity. If you transmit three long RADE calls and nobody decodes you, do not keep repeating forever. Return to the announced backup method, check your levels, and ask for a short report from a station that can monitor you.

Common Problems and What They Usually Mean

“I Have RF Output, but Nobody Decodes Me”

Suspect wrong mode, wrong sideband or data setting, distorted transmit audio, excessive ALC, or being off the net’s expected frequency. Reduce drive, confirm RADE selection, and verify the radio is not applying speech processing.

“I Decode Others, but They Cannot Decode Me”

Your receive path may be fine while your transmit path is wrong. Check the selected transmit audio device. Many computers have multiple similar device names, and an update can change the default device unexpectedly.

“PTT Keys, Then Stays Keyed”

Know the emergency stop: the radio’s power button, PTT release, interface disconnect, or software transmit toggle. After stopping, check CAT settings, serial control lines, and whether another program is asserting PTT.

“The Signal Sounds Loud, but Copy Is Bad”

Loud is not the same as clean. Digital modes need waveform integrity. Look for clipping, compression, audio enhancements, or a receive filter that is too narrow or badly centered.

FAQ

Do I need a special radio for FreeDV RADE?

Usually, the key requirement is a stable SSB-capable HF station with suitable computer audio and PTT control. A radio with built-in USB audio makes wiring easier, but external sound interfaces are also common. Always follow the current FreeDV manual for supported configurations.

Should I run full power?

Not as a first step. Start low, verify clean audio and acceptable SWR, then use only the power needed for the contact or net conditions. Watch duty cycle and heat. Some digital voice operation can keep the transmitter working harder than casual SSB speech peaks.

Can I use my normal SSB microphone settings?

Maybe, but do not assume they are correct. SSB processing that helps punchy analog voice can hurt digital audio. Build a separate radio memory or software profile for FreeDV if your equipment allows it.

Is RADE guaranteed to beat SSB in weak conditions?

No. Propagation, interference, station setup, mode settings, and operator procedure all matter. RADE is an interesting HF digital voice option, not a guarantee of copy under every condition.

Key Takeaways

A reliable FreeDV RADE setup depends on clean audio, not maximum gain.
Verify receive levels, transmit levels, CAT control, and PTT before the net starts.
Disable audio processing that can clip or reshape the digital waveform.
Use current documentation and net instructions rather than old frequency or setup notes.
Have an analog SSB or coordination fallback ready before calling CQ.
Operate within your privileges, identify properly, and avoid interfering with existing activity.

RADE net night is much more enjoyable when your station is predictable. Spend a few minutes on audio levels, rig control, and fallback planning, and you will arrive ready to participate instead of troubleshooting on frequency.