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The radio's noise: the GNSS receiver costs 8 dB; a setting pauses it (#20)

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Debug Builds: `lora noise test` changes one thing at a time, Sweeps the
band, and reports the floor under each condition; it runs on the device
by itself, since one condition pauses Wi-Fi (not saved, so a restart
brings it back). Result, at 125 kHz: -117 dBm with the antenna switched
off, -106 with the GNSS receiver in standby, -98 with it running. The
receiver's serial line isn't it (one sentence a second changes nothing),
and neither are the main loop, the CPU frequency, Wi-Fi, the screen or
the radio's own regulator, all within 1 dB.

Settings > "Pause GNSS for LoRa", off by default: the receiver waits in
standby while the radio listens or sweeps, except during a Track, and
has a Fix again about 7 s after. The GNSS App says it's paused.

11 dB remain between the antenna with GNSS quiet and the chip alone,
untouched by anything that can be switched from the firmware.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
This commit is contained in:
twisla
2026-10-06 03:41:15 +02:00
co-authored by Claude Opus 5.5
parent 06a593293d
commit 70fb37ebb5
17 changed files with 337 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
test/test_settings_menu/test_settings_menu.cpp
+14
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@@ -107,6 +107,19 @@ void test_names_are_text_rows_with_their_byte_limits() {
TEST_ASSERT_EQUAL_STRING("RORO", f.menu.value(shortName).c_str());
}
// Issue #20: the GNSS receiver raises the LoRa radio's noise floor by 8 dB while it runs. Pausing
// it while the radio listens is offered, and off unless chosen (GNSS on by default: M2, Q58).
void test_pause_gnss_for_lora_is_off_by_default() {
Fixture f;
int quiet = f.row(SettingsMenu::Row::GnssQuiet);
TEST_ASSERT_EQUAL_STRING("Pause GNSS for LoRa", f.menu.label(quiet).c_str());
TEST_ASSERT_EQUAL_STRING("Off", f.menu.value(quiet).c_str());
f.menu.toggle(quiet);
TEST_ASSERT_TRUE(f.settings.getBool(Setting::GnssQuietForLora));
TEST_ASSERT_EQUAL_STRING("On", f.menu.value(quiet).c_str());
TEST_ASSERT_TRUE(f.settings.getBool(Setting::GnssEnabled)); // the GNSS switch itself is untouched
}
void test_gnss_and_coordinate_rows_toggle() {
Fixture f;
int gnss = f.row(SettingsMenu::Row::Gnss), coords = f.row(SettingsMenu::Row::Coordinates);
@@ -131,6 +144,7 @@ int main() {
RUN_TEST(test_brightness_steps_with_left_right_within_bounds);
RUN_TEST(test_wifi_is_a_page);
RUN_TEST(test_names_are_text_rows_with_their_byte_limits);
RUN_TEST(test_pause_gnss_for_lora_is_off_by_default);
RUN_TEST(test_gnss_and_coordinate_rows_toggle);
return UNITY_END();
}