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Measured radio2 pilot frequency.

This commit is contained in:
Joris van Rantwijk 2014-01-20 07:50:15 +01:00
parent 4bff1f823b
commit fda975b1ff
2 changed files with 5 additions and 2 deletions
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6
NOTES.txt
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@ -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)
--

1
TODO.txt
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@ -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")