RX Controls

RX Controls

The RX applet on the right panel provides all receiver controls.

Header Row

• Slice badge (A/B/C/D) — colored per slice
• Lock icon — tune lock
• Antenna — RX/TX antenna indicators
• Filter width — current filter bandwidth
• Mode dropdown — USB, LSB, CW, AM, FM, etc.
• Frequency — double-click to enter directly

Step Size

Step stepper with ◀ ▶ buttons. Available sizes: 10, 50, 100, 250, 500, 1000, 2500, 5000, 10000 Hz. Step sizes are mode-dependent.

Filter Presets

Mode-dependent filter width buttons:

• USB/LSB: 1.8K, 2.1K, 2.4K, 2.7K, 3.3K, 6K
• CW: 50, 100, 250, 400, 500, 1K
• AM/SAM: 3K, 4K, 6K, 10K, 14K, 20K
• DIGU/DIGL: 1K, 2.4K, 3K
• FM/NFM: fixed by firmware (cannot be changed)

AF Gain / Pan

• AF slider (0-100) — audio volume (client-side)
• Pan slider (L/R) — stereo balance with center marker
• Mute — speaker emoji toggle

Squelch

• SQL button — enable/disable
• Level slider (0-100)

AGC

• Mode dropdown — Off, Slow, Med, Fast
• Threshold slider — AGC-T level

DSP Toggles

Radio-side DSP (runs on the radio's FPGA):

• NB — Noise Blanker (+ level in DSP side panel)
• ANF — Auto Notch Filter
• NRL — Noise Reduction Leaky
• NRS — Noise Reduction Speech (BigBend / Aurora only)
• NRF — Noise Reduction Filter (BigBend / Aurora only)
• ANFL / ANFT — additional notch filters
• APF — Audio Peaking Filter (CW mode only)

Client-side NR (runs on your PC; mutually exclusive — see DSP Noise Mitigation):

• NR2 — spectral / Ephraim-Malah MMSE-LSA (always available)
• RN2 — RNNoise neural network (always available)
• NR4 — libspecbleach spectral denoiser (requires HAVE_SPECBLEACH build flag; on Windows that means LLVM clang-cl)
• MNR — Apple MMSE-Wiener (macOS-only)
• BNR — NVIDIA Maxine GPU AI (requires NVIDIA RTX GPU + Docker)
• DFNR — DeepFilterNet3 neural (requires HAVE_DFNR build flag)

Three-state cycles share a button to keep the row compact:

• NR — Off → NR (radio) → NR2 (client spectral) → Off
• RNN — Off → RNN (radio) → RN2 (client RNNoise) → Off

The remaining client NR backends each have their own button.

ADSP — opens the Aetherial DSP Settings dialog (full parameter view for every NR backend). Right-click any DSP button for a quick parameter popup without leaving the panel.

ADSP cluster bypass — the ADSP chip in the Aetherial Audio CHAIN row bypasses all client-side NR backends in one click and restores your selection on the second click — useful for A/B comparing processed vs. unprocessed receive audio.

Client-side NR backends are voice-only and auto-disable when you switch to CW, RTTY, or DIGI modes.

RIT / XIT

• RIT — Receiver Incremental Tuning (amber toggle + zero + step buttons)
• XIT — Transmitter Incremental Tuning (same layout)
• Step: 10 Hz per click

CW Decoder (CW/CWL modes only)

When CW or CWL mode is selected, a decode panel appears below the waterfall:

• Real-time Morse decode using the ggmorse library (MIT)
• Auto-detects tone pitch (200-1200 Hz) and speed (5-55 WPM)
• Confidence coloring — decoded text is color-coded by decode quality:
  • Green: high confidence
  • Yellow: medium confidence
  • Orange: questionable
  • Red: low confidence
• Stats bar shows detected pitch (Hz) and speed (WPM)
• CLR button clears the decode text
• Panel auto-shows when entering CW mode and auto-hides when leaving

The decoder runs on a separate thread and has negligible CPU impact. It works best on clean, well-spaced CW signals. Fast or sloppy fists may produce more yellow/orange text.

FM Controls (FM/NFM modes only)

When FM or NFM is selected, the DSP tab becomes OPT:

• Tone mode (Off, CTCSS TX, CTCSS TX/RX)
• Tone value (41 standard EIA tones, 67.0-254.1 Hz)
• Repeater offset (MHz)
• Direction (Simplex, Up, Down)
• REV button