RealMorse! DJ0MZ Callsign Trainer

Message Types

Source

Template

Transcript

Reveal transcript

dur:— wpm:20 fw:12 seed:— —

Propagation Condition Model

Sets Channel fading + path loss + noise.

Set parameters in Parameter Model (Params) as required.

Parameter Model

Realistic model: Transmitter → Channel → Receiver

Pitch = TX tone frequency. TX FM includes drift+chirp. Channel AM includes QSB/flutter; Channel FM includes satellite Doppler. Noise floor and signal attenuation are Channel. Receiver contains filter + AGC only.

Transmitter (CW generation)

Keying & timing

WPM 20 Farnsworth spacing (WPM) 5 Vibroplex ratio (dah:dit) 3.0 Bug swing (%) 0 Jitter (%) 3.0 Element weight (±%) 0 Post-message silence (s) 1.2

Send twice

Envelope & tone

Attack (ms) 6 Release (ms) 12 Carrier pitch (Hz) 650

FM & instability (TX)

Drift (Hz/min) 0.0 Chirp (Hz) 0 Chirp decay (ms) 18

Channel (propagation & interference)

QSB (AM fading)

QSB depth (%) 30 QSB rate (Hz) 0.22 Flutter depth (%) 10 Flutter rate (Hz) 4.5

QRN (natural interference): Path loss & noise floor

Signal attenuation (dB) 0 Noise floor / QRN (dB) -24 Static crashes (per minute) 3 Static burst level 0.25

Noise and static are channel-origin additive components entering the receiver input.

QRM (manmade interference)

Enable interferer CW QRM is keyed too

Interferers (0–2) 1 QRM level (dB) -18 QRM separation (Hz) 180

Satellite Doppler (FM)

Satellite Doppler Max Doppler (Hz) 0 Pass duration (s, 0 = full message) 0

Receiver (filter & AGC)

IF / CW filter

Bandpass Q (width) 8.0

AGC

AGC amount (%) 0 AGC attack (ms) 10 AGC release (ms) 350

Fast release can make hiss rise in gaps; slow release keeps gain reduced between words (quieter gaps).

Seed (deterministic playback)

Seed (optional, reproducible)

Same seed + same settings ⇒ identical audio. Empty seed ⇒ new random seed on Generate.

RealMorse! User Manual

RealMorse! generates Morse code audio for practice. Choose a message type, choose either a simple propagation preset or full manual parameters, then click Generate.

Quick start

Select a message source in Message Types.
Choose Condx for simple operation or Params for full control.
Set speaker volume with the slider in the top bar.
Click Generate to create and play one item.
Click Stop to stop playback at any time.

Message Types

Random callsigns generates one random amateur callsign.

Template phrases sends a short built-in radio exchange.

Custom text sends your own text.

Random characters sends random training characters from the selected pool.

Generate and Generate n

Generate creates and plays one message.

Generate n is intended for:

Random characters: sends a sequence of n characters.
Random callsigns: sends a sequence of n callsigns.

Condx mode

Condx is the simple mode. Timing and receiver behavior stay fixed, while the channel is changed by the selected condition: Excellent, Good, Moderate, Bad, or Very bad.

Use this mode when you want quick practice without adjusting many controls.

Params mode

Params enables full manual control of the signal model.

Transmitter: speed, spacing, tone, drift, chirp, keying shape
Channel: fading, attenuation, noise, static, QRM, Doppler
Receiver: filter width and AGC

Parameter changes take effect the next time you click Generate or Generate n.

Random character pools

For Random characters, choose a pool of: letters, numerals, punctuation, mixed sets, or your own custom set.

In User selection, click Configure… and choose up to 5 characters.

Transcript and seed

Reveal transcript shows the generated text on screen. Turn it off if you want copy practice without seeing the answer.

Clear transcript clears the current transcript display.

Seed makes playback repeatable. The same seed plus the same settings produces the same generated result.

Tips

Start in Condx mode for simple practice.
Use Random characters with a small custom pool for focused drills.
Use Random callsigns to practice realistic call copy.
Use a fixed Seed when comparing settings or repeating a difficult item.