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Fix Morse mode HF reception, stop button, and UX guidance

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Enable direct sampling (-D 2) for RTL-SDR at HF frequencies below 24 MHz
so rtl_fm can actually receive CW signals. Add startup health check to
detect immediate rtl_fm failures. Push stopped status event from decoder
thread on EOF so the frontend auto-resets. Add frequency placeholder and
help text. Fix stop button silently swallowing errors.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-26 08:43:51 +00:00
parent 2ec458aa14
commit 0bf8341b6c
5 changed files with 65 additions and 22 deletions
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48
utils/sdr/rtlsdr.py
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@@ -14,16 +14,16 @@ from typing import Optional
from .base import CommandBuilder, SDRCapabilities, SDRDevice, SDRType
from utils.dependencies import get_tool_path
logger = logging.getLogger('intercept.sdr.rtlsdr')
def _rtl_fm_demod_mode(modulation: str) -> str:
"""Map app/UI modulation names to rtl_fm demod tokens."""
mod = str(modulation or '').lower().strip()
return 'wbfm' if mod == 'wfm' else mod
def _get_dump1090_bias_t_flag(dump1090_path: str) -> Optional[str]:
logger = logging.getLogger('intercept.sdr.rtlsdr')
def _rtl_fm_demod_mode(modulation: str) -> str:
"""Map app/UI modulation names to rtl_fm demod tokens."""
mod = str(modulation or '').lower().strip()
return 'wbfm' if mod == 'wfm' else mod
def _get_dump1090_bias_t_flag(dump1090_path: str) -> Optional[str]:
"""Detect the correct bias-t flag for the installed dump1090 variant.
Different dump1090 forks use different flags:
@@ -86,22 +86,27 @@ class RTLSDRCommandBuilder(CommandBuilder):
ppm: Optional[int] = None,
modulation: str = "fm",
squelch: Optional[int] = None,
bias_t: bool = False
bias_t: bool = False,
direct_sampling: Optional[int] = None,
) -> list[str]:
"""
Build rtl_fm command for FM demodulation.
Used for pager decoding. Supports local devices and rtl_tcp connections.
Args:
direct_sampling: Enable direct sampling mode (0=off, 1=I-branch,
2=Q-branch). Use 2 for HF reception below 24 MHz.
"""
rtl_fm_path = get_tool_path('rtl_fm') or 'rtl_fm'
demod_mode = _rtl_fm_demod_mode(modulation)
cmd = [
rtl_fm_path,
'-d', self._get_device_arg(device),
'-f', f'{frequency_mhz}M',
'-M', demod_mode,
'-s', str(sample_rate),
]
rtl_fm_path = get_tool_path('rtl_fm') or 'rtl_fm'
demod_mode = _rtl_fm_demod_mode(modulation)
cmd = [
rtl_fm_path,
'-d', self._get_device_arg(device),
'-f', f'{frequency_mhz}M',
'-M', demod_mode,
'-s', str(sample_rate),
]
if gain is not None and gain > 0:
cmd.extend(['-g', str(gain)])
@@ -112,6 +117,9 @@ class RTLSDRCommandBuilder(CommandBuilder):
if squelch is not None and squelch > 0:
cmd.extend(['-l', str(squelch)])
if direct_sampling is not None:
cmd.extend(['-D', str(direct_sampling)])
if bias_t:
cmd.extend(['-T'])