23 lines
1.4 KiB
Plaintext
23 lines
1.4 KiB
Plaintext
* (experiment) measure raw signal for radio3, radio4 for ~ 1 minute
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* different gain settings
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* with/without RTL AGC mode
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* with several IF gain settings
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* confirm theories about effect of gain, IF gain, AGC
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* look for effect of gain on baseband SNR
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* look for effect of ADC calibration on baseband SNR
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* look for effect of IF bandwidth on baseband SNR
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* (experiment) try if RTL2832 FIR filter can be optimized
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* (feature) support 'M' 'k' suffixes for sample rates and tuning frequency
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* (feature) implement off-line FM decoder in Python for experimentation
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* (feature) implement stereo pilot pulse-per-second
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* (quality) consider DC offset calibration
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* (speedup) maybe replace high-order FIR downsampling filter with 2nd order butterworth followed by lower order FIR filter
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* figure out why we sometimes lose stereo lock
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* it looks like IF level sometimes varies so much that it saturates the receiver; perhaps this can be solved by dynamically managing the hardware gain in response to level measurements
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* investigate problem at low IF sample rates; it seems that librtlsdr is not telling the truth about the actual sample rate.
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* (quality) figure out if I/Q balance can improve weak stations
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* (quality) figure out if hardware gain settings can improve weak stations
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* (feature) implement RDS decoding
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* (quality) consider FM demodulation with PLL instead of phase discriminator
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