From fda975b1ffaa78739673a6484d90739ea3579de1 Mon Sep 17 00:00:00 2001 From: Joris van Rantwijk Date: Mon, 20 Jan 2014 07:50:15 +0100 Subject: [PATCH] Measured radio2 pilot frequency. --- NOTES.txt | 6 ++++-- TODO.txt | 1 + 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/NOTES.txt b/NOTES.txt index 4a8fd36..b3e6b2c 100644 --- a/NOTES.txt +++ b/NOTES.txt @@ -175,7 +175,9 @@ radio west 89300000 (medium) Stereo pilot frequency ---------------------- -radio3 19 kHz pilot = 18999.8 Hz +- 0.05 Hz -(5 hour measurement of pilot vs internet NTP) +Measuring 19 kHz pilot frequency vs Internet NTP (ADSL): + +radio2 19 kHz pilot = 18999.79 Hz +- 0.04 Hz (7 hours measurement) +radio3 19 kHz pilot = 18999.8 Hz +- 0.05 Hz (5 hours measurement) -- diff --git a/TODO.txt b/TODO.txt index e13f8b7..6137e32 100644 --- a/TODO.txt +++ b/TODO.txt @@ -1,6 +1,7 @@ * (speedup) maybe replace high-order FIR downsampling filter with 2nd order butterworth followed by lower order FIR filter * figure out why we sometimes lose stereo lock * (feature) implement RDS decoding +* (quality) consider type 1 PLL with ~ 10 Hz bandwidth for stereo pilot * (quality) consider FM demodulation with PLL instead of phase discriminator * (speedup) consider downsampling of IF signal before FM detection (work in progress in branch "filterif")