diff --git a/firmware/baseband/proc_wideband_spectrum.cpp b/firmware/baseband/proc_wideband_spectrum.cpp
index aa8d6f5f..8fc46197 100644
--- a/firmware/baseband/proc_wideband_spectrum.cpp
+++ b/firmware/baseband/proc_wideband_spectrum.cpp
@@ -31,136 +31,144 @@ using namespace lpc43xx;
 
 #include <array>
 
-// numpy.array(numpy.round(scipy.signal.windows.blackmanharris(1024) * 32767), dtype=numpy.int16)
-static constexpr std::array<int16_t, 1024> window_blackmanharris_1024 { {
-    2,     2,     2,     2,     2,     2,     3,     3,
-    3,     3,     4,     4,     5,     5,     5,     6,
-    7,     7,     8,     8,     9,    10,    11,    12,
-   13,    14,    15,    16,    17,    18,    19,    20,
-   22,    23,    24,    26,    27,    29,    31,    32,
-   34,    36,    38,    40,    42,    44,    46,    48,
-   51,    53,    56,    58,    61,    64,    67,    70,
-   73,    76,    79,    82,    86,    89,    93,    97,
-  100,   104,   109,   113,   117,   122,   126,   131,
-  136,   141,   146,   151,   156,   162,   168,   173,
-  179,   186,   192,   198,   205,   212,   219,   226,
-  233,   241,   249,   256,   265,   273,   281,   290,
-  299,   308,   317,   327,   337,   347,   357,   367,
-  378,   389,   400,   411,   423,   435,   447,   459,
-  472,   485,   498,   512,   526,   540,   554,   569,
-  584,   599,   614,   630,   646,   663,   680,   697,
-  714,   732,   750,   769,   788,   807,   827,   846,
-  867,   887,   908,   930,   952,   974,   996,  1019,
- 1043,  1066,  1091,  1115,  1140,  1166,  1192,  1218,
- 1245,  1272,  1299,  1327,  1356,  1385,  1414,  1444,
- 1475,  1506,  1537,  1569,  1601,  1634,  1667,  1701,
- 1735,  1770,  1805,  1841,  1878,  1915,  1952,  1990,
- 2029,  2068,  2107,  2147,  2188,  2229,  2271,  2314,
- 2357,  2400,  2444,  2489,  2534,  2580,  2627,  2674,
- 2721,  2770,  2819,  2868,  2918,  2969,  3020,  3072,
- 3125,  3178,  3232,  3287,  3342,  3398,  3454,  3511,
- 3569,  3628,  3687,  3746,  3807,  3868,  3930,  3992,
- 4055,  4119,  4183,  4249,  4314,  4381,  4448,  4516,
- 4585,  4654,  4724,  4794,  4866,  4938,  5010,  5084,
- 5158,  5233,  5308,  5385,  5462,  5539,  5618,  5697,
- 5776,  5857,  5938,  6020,  6103,  6186,  6270,  6355,
- 6440,  6526,  6613,  6700,  6789,  6878,  6967,  7058,
- 7149,  7240,  7333,  7426,  7520,  7614,  7710,  7805,
- 7902,  7999,  8097,  8196,  8295,  8395,  8496,  8597,
- 8699,  8802,  8905,  9009,  9114,  9219,  9325,  9431,
- 9539,  9646,  9755,  9864,  9974, 10084, 10195, 10306,
-10419, 10531, 10645, 10759, 10873, 10988, 11104, 11220,
-11337, 11454, 11572, 11691, 11810, 11929, 12049, 12170,
-12291, 12412, 12534, 12657, 12780, 12903, 13027, 13152,
-13277, 13402, 13528, 13654, 13781, 13908, 14035, 14163,
-14291, 14420, 14549, 14678, 14808, 14938, 15068, 15199,
-15330, 15461, 15593, 15725, 15857, 15989, 16122, 16255,
-16388, 16522, 16655, 16789, 16923, 17058, 17192, 17327,
-17461, 17596, 17731, 17867, 18002, 18137, 18273, 18408,
-18544, 18680, 18815, 18951, 19087, 19223, 19358, 19494,
-19630, 19765, 19901, 20037, 20172, 20308, 20443, 20578,
-20713, 20848, 20983, 21118, 21252, 21386, 21520, 21654,
-21788, 21921, 22054, 22187, 22320, 22452, 22584, 22716,
-22847, 22978, 23109, 23239, 23369, 23499, 23628, 23757,
-23885, 24013, 24140, 24267, 24394, 24520, 24645, 24770,
-24894, 25018, 25142, 25264, 25386, 25508, 25629, 25749,
-25869, 25988, 26106, 26224, 26341, 26457, 26573, 26688,
-26802, 26915, 27028, 27139, 27251, 27361, 27470, 27579,
-27687, 27794, 27900, 28005, 28109, 28213, 28315, 28417,
-28518, 28617, 28716, 28814, 28911, 29007, 29102, 29196,
-29288, 29380, 29471, 29561, 29650, 29737, 29824, 29909,
-29994, 30077, 30159, 30240, 30320, 30399, 30477, 30553,
-30628, 30702, 30775, 30847, 30918, 30987, 31055, 31122,
-31188, 31252, 31315, 31377, 31438, 31497, 31555, 31612,
-31667, 31721, 31774, 31826, 31876, 31925, 31972, 32019,
-32064, 32107, 32149, 32190, 32230, 32268, 32304, 32340,
-32374, 32406, 32438, 32467, 32496, 32523, 32548, 32573,
-32595, 32617, 32637, 32655, 32672, 32688, 32702, 32715,
-32727, 32737, 32745, 32753, 32758, 32763, 32765, 32767,
-32767, 32765, 32763, 32758, 32753, 32745, 32737, 32727,
-32715, 32702, 32688, 32672, 32655, 32637, 32617, 32595,
-32573, 32548, 32523, 32496, 32467, 32438, 32406, 32374,
-32340, 32304, 32268, 32230, 32190, 32149, 32107, 32064,
-32019, 31972, 31925, 31876, 31826, 31774, 31721, 31667,
-31612, 31555, 31497, 31438, 31377, 31315, 31252, 31188,
-31122, 31055, 30987, 30918, 30847, 30775, 30702, 30628,
-30553, 30477, 30399, 30320, 30240, 30159, 30077, 29994,
-29909, 29824, 29737, 29650, 29561, 29471, 29380, 29288,
-29196, 29102, 29007, 28911, 28814, 28716, 28617, 28518,
-28417, 28315, 28213, 28109, 28005, 27900, 27794, 27687,
-27579, 27470, 27361, 27251, 27139, 27028, 26915, 26802,
-26688, 26573, 26457, 26341, 26224, 26106, 25988, 25869,
-25749, 25629, 25508, 25386, 25264, 25142, 25018, 24894,
-24770, 24645, 24520, 24394, 24267, 24140, 24013, 23885,
-23757, 23628, 23499, 23369, 23239, 23109, 22978, 22847,
-22716, 22584, 22452, 22320, 22187, 22054, 21921, 21788,
-21654, 21520, 21386, 21252, 21118, 20983, 20848, 20713,
-20578, 20443, 20308, 20172, 20037, 19901, 19765, 19630,
-19494, 19358, 19223, 19087, 18951, 18815, 18680, 18544,
-18408, 18273, 18137, 18002, 17867, 17731, 17596, 17461,
-17327, 17192, 17058, 16923, 16789, 16655, 16522, 16388,
-16255, 16122, 15989, 15857, 15725, 15593, 15461, 15330,
-15199, 15068, 14938, 14808, 14678, 14549, 14420, 14291,
-14163, 14035, 13908, 13781, 13654, 13528, 13402, 13277,
-13152, 13027, 12903, 12780, 12657, 12534, 12412, 12291,
-12170, 12049, 11929, 11810, 11691, 11572, 11454, 11337,
-11220, 11104, 10988, 10873, 10759, 10645, 10531, 10419,
-10306, 10195, 10084,  9974,  9864,  9755,  9646,  9539,
- 9431,  9325,  9219,  9114,  9009,  8905,  8802,  8699,
- 8597,  8496,  8395,  8295,  8196,  8097,  7999,  7902,
- 7805,  7710,  7614,  7520,  7426,  7333,  7240,  7149,
- 7058,  6967,  6878,  6789,  6700,  6613,  6526,  6440,
- 6355,  6270,  6186,  6103,  6020,  5938,  5857,  5776,
- 5697,  5618,  5539,  5462,  5385,  5308,  5233,  5158,
- 5084,  5010,  4938,  4866,  4794,  4724,  4654,  4585,
- 4516,  4448,  4381,  4314,  4249,  4183,  4119,  4055,
- 3992,  3930,  3868,  3807,  3746,  3687,  3628,  3569,
- 3511,  3454,  3398,  3342,  3287,  3232,  3178,  3125,
- 3072,  3020,  2969,  2918,  2868,  2819,  2770,  2721,
- 2674,  2627,  2580,  2534,  2489,  2444,  2400,  2357,
- 2314,  2271,  2229,  2188,  2147,  2107,  2068,  2029,
- 1990,  1952,  1915,  1878,  1841,  1805,  1770,  1735,
- 1701,  1667,  1634,  1601,  1569,  1537,  1506,  1475,
- 1444,  1414,  1385,  1356,  1327,  1299,  1272,  1245,
- 1218,  1192,  1166,  1140,  1115,  1091,  1066,  1043,
- 1019,   996,   974,   952,   930,   908,   887,   867,
-  846,   827,   807,   788,   769,   750,   732,   714,
-  697,   680,   663,   646,   630,   614,   599,   584,
-  569,   554,   540,   526,   512,   498,   485,   472,
-  459,   447,   435,   423,   411,   400,   389,   378,
-  367,   357,   347,   337,   327,   317,   308,   299,
-  290,   281,   273,   265,   256,   249,   241,   233,
-  226,   219,   212,   205,   198,   192,   186,   179,
-  173,   168,   162,   156,   151,   146,   141,   136,
-  131,   126,   122,   117,   113,   109,   104,   100,
-   97,    93,    89,    86,    82,    79,    76,    73,
-   70,    67,    64,    61,    58,    56,    53,    51,
-   48,    46,    44,    42,    40,    38,    36,    34,
-   32,    31,    29,    27,    26,    24,    23,    22,
-   20,    19,    18,    17,    16,    15,    14,    13,
-   12,    11,    10,     9,     8,     8,     7,     7,
-    6,     5,     5,     5,     4,     4,     3,     3,
-    3,     3,     2,     2,     2,     2,     2,     2,
+/*
+Employ window-presum technique with a window constructed to act like a bin filter.
+See: http://www.embedded.com/design/real-time-and-performance/4007611/DSP-Tricks-Building-a-practical-spectrum-analyzer
+
+import scipy.signal
+
+d = scipy.signal.remez(1024, (0.0, 32000, 48000, 10000000), (1, 0), Hz=20000000)
+for n in range(0, len(d), 8): print(' '.join(['%5d,' % int(round(v * 32768 * 128)) for v in d[n:n+8]]))
+*/
+static constexpr std::array<int16_t, 1024> window_wideband_bin_lpf { {
+	    0, -3409, -3284, -3358, -3235, -3312, -3187, -3270,
+	-3143, -3233, -3100, -3202, -3057, -3186, -3009, -3261,
+	-2777, -2904, -3087, -3076, -3058, -3069, -3013, -3037,
+	-2969, -3004, -2931, -2976, -2898, -2956, -2870, -2957,
+	-2871, -2830, -2866, -2914, -2874, -2919, -2864, -2911,
+	-2854, -2905, -2849, -2905, -2851, -2910, -2858, -2917,
+	-2893, -2901, -2866, -2949, -2901, -2970, -2914, -2979,
+	-2923, -2987, -2932, -2997, -2945, -3009, -2960, -3020,
+	-2986, -3043, -2971, -3059, -3005, -3082, -3023, -3094,
+	-3035, -3105, -3048, -3119, -3064, -3135, -3083, -3153,
+	-3102, -3186, -3111, -3193, -3141, -3221, -3166, -3242,
+	-3186, -3260, -3204, -3280, -3225, -3302, -3249, -3327,
+	-3269, -3358, -3296, -3367, -3318, -3395, -3344, -3418,
+	-3364, -3436, -3381, -3455, -3400, -3474, -3420, -3495,
+	-3437, -3515, -3464, -3527, -3475, -3546, -3494, -3564,
+	-3510, -3578, -3523, -3591, -3535, -3604, -3549, -3618,
+	-3563, -3628, -3581, -3641, -3585, -3650, -3596, -3661,
+	-3605, -3668, -3610, -3672, -3615, -3676, -3619, -3680,
+	-3624, -3680, -3626, -3686, -3622, -3680, -3619, -3677,
+	-3616, -3672, -3609, -3663, -3600, -3653, -3590, -3642,
+	-3580, -3630, -3564, -3619, -3550, -3599, -3531, -3581,
+	-3513, -3561, -3492, -3538, -3468, -3513, -3443, -3487,
+	-3417, -3461, -3386, -3432, -3358, -3398, -3323, -3362,
+	-3288, -3326, -3251, -3287, -3210, -3245, -3168, -3202,
+	-3123, -3158, -3076, -3108, -3030, -3059, -2976, -3004,
+	-2922, -2949, -2866, -2892, -2808, -2832, -2746, -2770,
+	-2683, -2706, -2619, -2637, -2552, -2570, -2481, -2497,
+	-2407, -2423, -2333, -2347, -2256, -2269, -2177, -2188,
+	-2095, -2104, -2012, -2018, -1924, -1931, -1835, -1839,
+	-1742, -1745, -1648, -1650, -1552, -1552, -1452, -1451,
+	-1351, -1347, -1247, -1243, -1139, -1135, -1031, -1024,
+	 -919,  -910,  -805,  -795,  -689,  -678,  -571,  -558,
+	 -451,  -436,  -327,  -313,  -202,  -186,   -75,   -57,
+	   55,    75,   187,   208,   320,   342,   456,   480,
+	  594,   619,   735,   760,   877,   905,  1021,  1050,
+	 1168,  1199,  1317,  1349,  1467,  1500,  1619,  1653,
+	 1773,  1808,  1930,  1966,  2086,  2125,  2247,  2285,
+	 2407,  2448,  2570,  2611,  2734,  2776,  2899,  2942,
+	 3066,  3110,  3234,  3280,  3403,  3450,  3575,  3622,
+	 3746,  3795,  3920,  3970,  4095,  4145,  4270,  4321,
+	 4446,  4499,  4624,  4678,  4803,  4856,  4983,  5037,
+	 5163,  5218,  5344,  5400,  5526,  5582,  5708,  5765,
+	 5891,  5948,  6074,  6133,  6259,  6316,  6442,  6502,
+	 6627,  6686,  6811,  6871,  6996,  7057,  7181,  7241,
+	 7365,  7427,  7550,  7612,  7736,  7797,  7920,  7982,
+	 8105,  8167,  8288,  8351,  8473,  8536,  8656,  8719,
+	 8839,  8902,  9022,  9084,  9204,  9267,  9385,  9448,
+	 9566,  9629,  9745,  9808,  9924,  9987, 10102, 10165,
+	10279, 10341, 10455, 10517, 10629, 10692, 10803, 10864,
+	10974, 11036, 11145, 11206, 11314, 11375, 11482, 11542,
+	11648, 11708, 11812, 11872, 11975, 12035, 12137, 12195,
+	12296, 12354, 12453, 12511, 12609, 12666, 12762, 12819,
+	12914, 12970, 13063, 13119, 13210, 13265, 13356, 13409,
+	13498, 13551, 13639, 13690, 13776, 13827, 13911, 13962,
+	14044, 14094, 14174, 14223, 14302, 14349, 14427, 14474,
+	14549, 14595, 14669, 14713, 14785, 14828, 14899, 14941,
+	15010, 15051, 15117, 15158, 15223, 15261, 15324, 15363,
+	15423, 15460, 15519, 15555, 15611, 15646, 15700, 15734,
+	15787, 15819, 15870, 15900, 15949, 15978, 16024, 16053,
+	16098, 16125, 16166, 16193, 16232, 16257, 16294, 16317,
+	16353, 16375, 16409, 16429, 16460, 16480, 16508, 16526,
+	16553, 16570, 16594, 16609, 16632, 16645, 16665, 16677,
+	16696, 16707, 16723, 16732, 16745, 16754, 16765, 16771,
+	16780, 16786, 16792, 16796, 16801, 16803, 16805, 16805,
+	16805, 16805, 16803, 16801, 16796, 16792, 16786, 16780,
+	16771, 16765, 16754, 16745, 16732, 16723, 16707, 16696,
+	16677, 16665, 16645, 16632, 16609, 16594, 16570, 16553,
+	16526, 16508, 16480, 16460, 16429, 16409, 16375, 16353,
+	16317, 16294, 16257, 16232, 16193, 16166, 16125, 16098,
+	16053, 16024, 15978, 15949, 15900, 15870, 15819, 15787,
+	15734, 15700, 15646, 15611, 15555, 15519, 15460, 15423,
+	15363, 15324, 15261, 15223, 15158, 15117, 15051, 15010,
+	14941, 14899, 14828, 14785, 14713, 14669, 14595, 14549,
+	14474, 14427, 14349, 14302, 14223, 14174, 14094, 14044,
+	13962, 13911, 13827, 13776, 13690, 13639, 13551, 13498,
+	13409, 13356, 13265, 13210, 13119, 13063, 12970, 12914,
+	12819, 12762, 12666, 12609, 12511, 12453, 12354, 12296,
+	12195, 12137, 12035, 11975, 11872, 11812, 11708, 11648,
+	11542, 11482, 11375, 11314, 11206, 11145, 11036, 10974,
+	10864, 10803, 10692, 10629, 10517, 10455, 10341, 10279,
+	10165, 10102,  9987,  9924,  9808,  9745,  9629,  9566,
+	 9448,  9385,  9267,  9204,  9084,  9022,  8902,  8839,
+	 8719,  8656,  8536,  8473,  8351,  8288,  8167,  8105,
+	 7982,  7920,  7797,  7736,  7612,  7550,  7427,  7365,
+	 7241,  7181,  7057,  6996,  6871,  6811,  6686,  6627,
+	 6502,  6442,  6316,  6259,  6133,  6074,  5948,  5891,
+	 5765,  5708,  5582,  5526,  5400,  5344,  5218,  5163,
+	 5037,  4983,  4856,  4803,  4678,  4624,  4499,  4446,
+	 4321,  4270,  4145,  4095,  3970,  3920,  3795,  3746,
+	 3622,  3575,  3450,  3403,  3280,  3234,  3110,  3066,
+	 2942,  2899,  2776,  2734,  2611,  2570,  2448,  2407,
+	 2285,  2247,  2125,  2086,  1966,  1930,  1808,  1773,
+	 1653,  1619,  1500,  1467,  1349,  1317,  1199,  1168,
+	 1050,  1021,   905,   877,   760,   735,   619,   594,
+	  480,   456,   342,   320,   208,   187,    75,    55,
+	  -57,   -75,  -186,  -202,  -313,  -327,  -436,  -451,
+	 -558,  -571,  -678,  -689,  -795,  -805,  -910,  -919,
+	-1024, -1031, -1135, -1139, -1243, -1247, -1347, -1351,
+	-1451, -1452, -1552, -1552, -1650, -1648, -1745, -1742,
+	-1839, -1835, -1931, -1924, -2018, -2012, -2104, -2095,
+	-2188, -2177, -2269, -2256, -2347, -2333, -2423, -2407,
+	-2497, -2481, -2570, -2552, -2637, -2619, -2706, -2683,
+	-2770, -2746, -2832, -2808, -2892, -2866, -2949, -2922,
+	-3004, -2976, -3059, -3030, -3108, -3076, -3158, -3123,
+	-3202, -3168, -3245, -3210, -3287, -3251, -3326, -3288,
+	-3362, -3323, -3398, -3358, -3432, -3386, -3461, -3417,
+	-3487, -3443, -3513, -3468, -3538, -3492, -3561, -3513,
+	-3581, -3531, -3599, -3550, -3619, -3564, -3630, -3580,
+	-3642, -3590, -3653, -3600, -3663, -3609, -3672, -3616,
+	-3677, -3619, -3680, -3622, -3686, -3626, -3680, -3624,
+	-3680, -3619, -3676, -3615, -3672, -3610, -3668, -3605,
+	-3661, -3596, -3650, -3585, -3641, -3581, -3628, -3563,
+	-3618, -3549, -3604, -3535, -3591, -3523, -3578, -3510,
+	-3564, -3494, -3546, -3475, -3527, -3464, -3515, -3437,
+	-3495, -3420, -3474, -3400, -3455, -3381, -3436, -3364,
+	-3418, -3344, -3395, -3318, -3367, -3296, -3358, -3269,
+	-3327, -3249, -3302, -3225, -3280, -3204, -3260, -3186,
+	-3242, -3166, -3221, -3141, -3193, -3111, -3186, -3102,
+	-3153, -3083, -3135, -3064, -3119, -3048, -3105, -3035,
+	-3094, -3023, -3082, -3005, -3059, -2971, -3043, -2986,
+	-3020, -2960, -3009, -2945, -2997, -2932, -2987, -2923,
+	-2979, -2914, -2970, -2901, -2949, -2866, -2901, -2893,
+	-2917, -2858, -2910, -2851, -2905, -2849, -2905, -2854,
+	-2911, -2864, -2919, -2874, -2914, -2866, -2830, -2871,
+	-2957, -2870, -2956, -2898, -2976, -2931, -3004, -2969,
+	-3037, -3013, -3069, -3058, -3076, -3087, -2904, -2777,
+	-3261, -3009, -3186, -3057, -3202, -3100, -3233, -3143,
+	-3270, -3187, -3312, -3235, -3358, -3284, -3409,     0,
 } };
 
 void WidebandSpectrum::execute(buffer_c8_t buffer) {
@@ -171,18 +179,19 @@ void WidebandSpectrum::execute(buffer_c8_t buffer) {
 		if( channel_spectrum_request_update == false ) {
 			channel_spectrum_request_update = true;
 
-      constexpr int32_t k = 128 * 4 * 8;
+			constexpr int32_t k = 128 * 16;
+			const auto& window = window_wideband_bin_lpf;
 			for(size_t i=0; i<channel_spectrum.size(); i++) {
-				int32_t real = 0;
-				int32_t imag = 0;
-				real += buffer.p[i +   0].real() * window_blackmanharris_1024[i +   0];
-				imag += buffer.p[i +   0].imag() * window_blackmanharris_1024[i +   0];
-				real += buffer.p[i + 256].real() * window_blackmanharris_1024[i + 256];
-				imag += buffer.p[i + 256].imag() * window_blackmanharris_1024[i + 256];
-				real += buffer.p[i + 512].real() * window_blackmanharris_1024[i + 512];
-				imag += buffer.p[i + 512].imag() * window_blackmanharris_1024[i + 512];
-				real += buffer.p[i + 768].real() * window_blackmanharris_1024[i + 768];
-				imag += buffer.p[i + 768].imag() * window_blackmanharris_1024[i + 768];
+				int64_t real = 0;
+				int64_t imag = 0;
+				real += buffer.p[i +   0].real() * window[i +   0];
+				imag += buffer.p[i +   0].imag() * window[i +   0];
+				real += buffer.p[i + 256].real() * window[i + 256];
+				imag += buffer.p[i + 256].imag() * window[i + 256];
+				real += buffer.p[i + 512].real() * window[i + 512];
+				imag += buffer.p[i + 512].imag() * window[i + 512];
+				real += buffer.p[i + 768].real() * window[i + 768];
+				imag += buffer.p[i + 768].imag() * window[i + 768];
 				channel_spectrum[i].real(real / k);
 				channel_spectrum[i].imag(imag / k);
 			}