For Onfliner and tgcfabian — please read the deviation note below before comparing against MPX Tool.
The FM deviation meter now reports a peak and an average
We were measuring the right quantity and publishing the wrong statistic. The reading has always been the full MPX, taken before de-emphasis and correctly scaled — but what we displayed was a 1.5 second average of 50 ms window peaks, labelled as peak deviation.
On heavily processed programme the modulation is nearly continuous, so the average is almost the peak and the reading was right — within 1 kHz of MPX Tool, as tgcfabian measured. On jazz, classical and speech the peaks are sparse, most windows contain none, and a 75 kHz peak read about 38 — as Onfliner reported. Both reports were correct. Only the averaging explains both.
The panel now shows three figures from one measurement, as a PIRA analyser does:
- Peak — a true peak meter, instant attack. The digits hold it flat for 3 seconds and then step, so it can actually be read; anything higher still appears immediately.
- Average — the 1.5 s figure the meter used to show. This is the number that was validated against MPX Tool and it has not changed.
- The bar fill follows the fast peak, with a quiet mark at the average and the hold tick above it.
★ If you are comparing with earlier notes: match your old readings against the new avg, not the new peak. On speech the peak will read far higher than before — BBC Radio 4 reads about peak 51 · avg 34 kHz. Both numbers are right; they answer different questions.
Also fixed in the measurement: the percentile discard scaled with the sample rate and threw away sparse transients whole, and the post-retune blanking is cut from 1.5 s to 0.4 s.
Airspy
- The tuner bandwidth no longer resets to ±100k when the phone is rotated. The per-mode default table was being re-applied on every mode-bearing message, including re-assertions of the mode you were already in.
- The free gain mode is remembered. It was never persisted, and re-opening the radio built a fresh source defaulting to Linear — so the app was faithfully painting what the radio honestly reported.
DAB
- The frequency entry shows a padlock in DAB mode and explains why, instead of accepting a number the server then silently refuses. There is no VFO inside a multiplex.
- An EXIT DAB button in the decoder box header. There is no close button in DAB — it used to strand you in the mode with nothing on screen.
- Leaving DAB restores your last non-DAB frequency and demodulator, or falls back to AM at the block.
Elsewhere
- NR/NB/AN indicators no longer appear on broadcast FM, where they are on by default for everyone and so say nothing. They remain on MW, HF and narrow FM, where they are an audible choice you made.
- Auto squelch, the server health pill and the storm meter's immunity to AGC steps, from the previous builds.
Sideload as usual; this is a pre-release for testing.