SDR for Linux
A modern GTK4 software-defined-radio application for HPSDR / ANAN
transceivers, built on the proven piHPSDR engine with a new, high-detail
user interface.
sdr-for-linux is a GPLv3 fork-in-spirit of
piHPSDR: it reuses piHPSDR's excellent
engine — the HPSDR Protocol 1 and 2 radio links and the WDSP DSP library — and
replaces the front-end with a native GTK4/libadwaita control surface and a
full-resolution floating-point panadapter. No DSP is reimplemented; WDSP
does the heavy lifting.
Status: 0.x — young but real. Everything below is implemented and
verified live on an Apache Labs ANAN G2E, an ANAN 10E and a
Hermes Lite 2 (all RX + TX), including CW and RTTY contest deployments;
see Supported hardware.
Features
Receive
-
Full-float panadapter + waterfall straight from the WDSP analyzer — no
quantisation, one column per display pixel (up to 8192, so a wide window
gets a sharper waterfall, not a stretched one); trace resolution
adjustable; 6 colour palettes, adjustable averaging & FPS
-
SSB / CW / AM / SAM / DIGU / DIGL / RTTY demodulation with piHPSDR filter
presets, passband drawn on the spectrum (RTTY: dial = FSK pair centre,
audio pitch adjustable — 800 Hz by default, 2210 = the classic 2125/2295).
SAM = WDSP synchronous AM: PLL-locked carrier (capture ±2 kHz about the
dial), both sidebands or LSB/USB only (a phasing selector in the Filter
dialog, not a filter — QRM on one side goes away without re-tuning), and
carrier levelling against fading for AM and SAM (Preferences → Audio)
-
Filter and AGC dialogs behind two header-bar icons: a passband graph
you drag (edges or the whole band), the mode's presets + Var1/Var2,
Low/High rows; AGC Off/Long/Slow/Med/Fast with a live gain bar and the
AGC-T threshold. Any preset's edges also drag right on the spectrum
(a dragged preset becomes Var1); LSB-family filters read as audio Hz
-
Parametric equalizer (header-bar icon or e): up to eight bands per
side — peak, low shelf, high shelf with frequency, gain and Q — edited on
a drawn response curve (drag a node, wheel for Q, double-click to add,
right-click to remove) with a row per band; one profile for RX (ahead of
the AGC, bypassed in digi modes so decoders hear the raw audio) and one
for TX (the pre-EQ ahead of PROC, live mic in voice modes only). The curve
is computed here and realized by WDSP's continuous-gain FIR equalizer
-
Two VFOs: A/B swap and A=B, the other VFO shown under the frequency
readout, free across bands; CTUN: drag pans the spectrum while the
dial stays put — the green passband is the tuning handle
-
Noise reduction — ANR (LMS), NR2 (spectral), NNR (WDSP's neural noise
reduction: two built-in models, the CW-trained ones switched in
automatically in CW modes; model and mask floor in Preferences → Audio)
and NR4 (libspecbleach); noise blanker (ANB, NB2), auto-notch (ANF),
binaural mode — the NR and NB buttons cycle through the algorithms
-
Low-latency native PipeWire audio (~15 ms), 48/96/192 kHz; the AF
slider's floor is a true mute
-
Scroll/drag/click-to-tune, octave-snap zoom, draggable spectrum/waterfall
divider, band buttons, band-plan overlay (IARU R1/R2/R3 + country
overrides), DX-spot overlay with click-to-tune
-
CW BFO offset done right: the dial reads the carrier, spots sound at your
sidetone pitch
Transmit (SSB voice, CW, RTTY, digi via TCI)
- MOX / TUNE with separate drive levels, per-band PA calibration,
true-PEP wattmeter, SWR metering with automatic drive-drop protection
- Mic via PipeWire with mic gain / noise gate / phase rotator (WDSP PHROT,
with its auto-optimizer and asymmetry readout) / parametric pre-EQ /
speech processor controls
(digi audio stays a bit-exact clean chain, enforced by the engine),
faithful TX monitor (plays the processed on-air audio), footswitch PTT
(the pedal counts only while the radio's status packets are live, and a
radio-link loss while keyed releases TX — the host never re-keys by
itself); Drive and TUNE power remembered per band
- CW keying with clean first-dit and contest-grade latency (TCI→RF
~35 ms, turnaround ~200 ms), adjustable WPM / sidetone / break-in hang;
mode-aware TX HUD (CW/RTTY sent-text with playhead, digi TX level)
- Native RTTY: direct-FSK modulator (45.45 Bd / 170 Hz, phase-continuous),
keyed from text over TCI (
rtty_macros:) — pair with a TCI logger and
the skimmer for decode
- PureSignal linearization with Thetis-style auto-attenuate — calibrates
continuously on voice, converges in seconds after drive/band changes
(G2E, G2 and Hermes Lite 2; on the G2E it needs the WDSP patch listed
under Known limitations; not available on old Hermes-class P2 firmware —
see the hardware table)
- TX panadapter + waterfall of the transmitted spectrum, with the TX
filter footprint drawn in red (the display's colour language: RX green,
TX red)
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