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https://github.com/rtlsdrblog/rtl-sdr-blog.git
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uhf appears to work better for ads-b
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
parent
259e61fb17
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b6652f33df
@ -167,20 +167,29 @@ static int closest_arr_idx(const uint32_t *arr, unsigned int arr_size, uint32_t
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}
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/* return 4-bit index as to which RF filter to select */
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static int choose_rf_filter(uint32_t freq)
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static int choose_rf_filter(enum e4k_band band, uint32_t freq)
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{
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int rc;
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if (freq < MHZ(350))
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rc = 0;
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else if (freq < MHZ(1000))
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rc = closest_arr_idx(rf_filt_center_uhf,
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ARRAY_SIZE(rf_filt_center_uhf),
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freq);
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else
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rc = closest_arr_idx(rf_filt_center_l,
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ARRAY_SIZE(rf_filt_center_l),
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freq);
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switch (band) {
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case E4K_BAND_VHF2:
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case E4K_BAND_VHF3:
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rc = 0;
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break;
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case E4K_BAND_UHF:
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rc = closest_arr_idx(rf_filt_center_uhf,
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ARRAY_SIZE(rf_filt_center_uhf),
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freq);
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break;
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case E4K_BAND_L:
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rc = closest_arr_idx(rf_filt_center_l,
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ARRAY_SIZE(rf_filt_center_l),
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freq);
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break;
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default:
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rc -EINVAL;
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break;
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}
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return rc;
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}
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@ -190,7 +199,7 @@ int e4k_rf_filter_set(struct e4k_state *e4k)
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{
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int rc;
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rc = choose_rf_filter(e4k->vco.flo);
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rc = choose_rf_filter(e4k->band, e4k->vco.flo);
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if (rc < 0)
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return rc;
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@ -525,7 +534,7 @@ int e4k_tune_params(struct e4k_state *e4k, struct e4k_pll_params *p)
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e4k_band_set(e4k, E4K_BAND_VHF2);
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else if (e4k->vco.flo < MHZ(350))
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e4k_band_set(e4k, E4K_BAND_VHF3);
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else if (e4k->vco.flo < MHZ(1000))
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else if (e4k->vco.flo < MHZ(1135))
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e4k_band_set(e4k, E4K_BAND_UHF);
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else
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e4k_band_set(e4k, E4K_BAND_L);
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