Skimmer frequency accuracy
To use the data below to improve the accuracy of your skimmer, multiply the current value of FreqCalibration in your skimmer software’s settings file with the suggested adjustment factor listed below.
The location of the settings files are:
CW Skimmer Server: %appdata%\Afreet\Products\SkimSrv\SkimSrv.ini
CW Skimmer: %appdata%\Afreet\Products\CwSkimmer\CwSkimmer.ini
To be a good RBN citizen your skimmer should be at or below 2ppm deviation.
Please note that the estimate below is an average across many bands from the respective skimmer. If different hardware is used for different bands, the number may not represent the actual deviation.
169182 RBN spots between 2020-08-10 00:00 and 2020-08-10 23:59. 55372 spots (32.7%) were from reference skimmers (*). Average spot flow was 117 per minute from 135 active CW skimmers. 93284 spots from 131 skimmers qualified for analysis by meeting the following criteria: * Mode of spot is CW. * Also spotted by a reference skimmer within 1000 spots. * Also spotted by a reference skimmer within 30s. * SNR is 3dB or higher. * Frequency is 7000kHz or higher. * Frequency deviation from reference skimmer is 0.5kHz or less. * At least 5 spots from same skimmer in data set. Skimmer [ppm] Spots Adjustment ------------------------------------- 3B8CW* +0.0 43 1.000000000 4X6HP +15.6 317 1.000015635 9A1CIG +8.5 276 1.000008531 9V1RM -1.8 63 0.999998170 AA4VV* -0.1 819 0.999999853 AC0C -0.6 123 0.999999422 BG4GOV3 -0.9 16 0.999999109 BG8FT +15.1 17 1.000015106 BI7JIS +0.3 57 1.000000250 CX6VM* +0.5 321 1.000000482 DD5XX -1.1 918 0.999998943 DE1LON* +0.2 1756 1.000000173 DF4XX +1.0 58 1.000001031 DJ2BC* +0.1 1415 1.000000120 DK0TE +2.9 1168 1.000002880 DK3UA +5.2 145 1.000005157 DK9IP* -0.0 1414 0.999999975 DL3DTH* -0.1 1830 0.999999944 DL9GTB +2.6 1628 1.000002555 DM7EE -1.0 891 0.999999024 DO4DXA +0.4 1332 1.000000406 DQ8Z +8.5 131 1.000008481 EA5WU* -0.2 916 0.999999821 EA8/DF4UE* +0.1 2257 1.000000140 ES3V +0.6 370 1.000000619 F4VSQ +12.2 244 1.000012199 F5UTN +12.6 828 1.000012616 F8DGY -1.0 2156 0.999999030 G4AON +0.9 91 1.000000875 G4HSO +2.0 1956 1.000002002 G4ZFE* -0.1 1678 0.999999933 GI4DOH* +0.1 928 1.000000119 HA1VHF +1.6 1141 1.000001635 HA6PX +2.3 1737 1.000002256 HA7GN +5.0 599 1.000004988 HB9BXE +0.6 1253 1.000000625 HB9CAT +4.5 960 1.000004482 HB9DCO -5.8 1467 0.999994233 HB9JCB +1.4 1390 1.000001379 HG2EWS +2.7 632 1.000002705 HS8KVH +3.1 157 1.000003109 IK3STG +1.0 782 1.000001024 IZ2CPS* -0.5 264 0.999999543 JA1LZR -1.2 212 0.999998820 JA4ZRK* -0.1 203 0.999999916 JG1VGX +1.0 17 1.000000955 JH7CSU1 +2.7 320 1.000002678 JI1HFJ +1.8 137 1.000001752 JJ2VLY +1.2 314 1.000001161 JO1YYP* -0.2 82 0.999999846 K1TTT -1.3 511 0.999998738 K3PA* -0.1 807 0.999999928 K9IMM +0.6 628 1.000000598 K9LC* -0.2 464 0.999999804 K9TM-4* +0.2 509 1.000000154 KC0VKN +7.0 12 1.000006993 KH6LC -1.4 31 0.999998620 KI4PAD -0.7 578 0.999999349 KL7RA +18.0 17 1.000018035 KM3T* -0.0 1486 0.999999974 KM3T-2* -0.0 1400 0.999999990 KM4SII +1.6 398 1.000001566 KO7SS +0.6 907 1.000000612 KO7SS-7 +1.0 606 1.000001035 KQ8M +1.4 230 1.000001423 KU7T +0.3 617 1.000000320 LA6TPA +1.0 503 1.000001015 LZ4AE +1.3 1714 1.000001267 LZ4UX* -0.2 497 0.999999773 LZ7AA* +0.1 949 1.000000082 N0OI +3.2 420 1.000003209 N5RZ -1.4 825 0.999998618 N6TV +1.0 195 1.000000962 N7TR -1.4 536 0.999998574 N7TUG +0.7 40 1.000000712 N9YKE -9.4 299 0.999990623 NA0B +0.0 8 1.000000000 NC7J +0.6 395 1.000000611 NN3RP -0.0 126 0.999999999 OE9GHV* -0.1 2091 0.999999905 OH6BG +1.5 1766 1.000001530 OK2EW -7.5 2709 0.999992485 OL7M +1.5 2125 1.000001457 ON6ZQ +2.3 1282 1.000002322 PJ2A -2.1 69 0.999997944 R6YY -0.3 507 0.999999714 RK3TD +1.0 29 1.000000983 RN4WA +7.4 974 1.000007391 RU9CZD +1.6 606 1.000001635 S50ARX -10.5 538 0.999989509 S53M +0.6 25 1.000000570 SE0X +2.8 898 1.000002781 SE5E* -0.2 1964 0.999999823 SM0TCZ +1.7 181 1.000001731 SM6FMB +4.8 1315 1.000004788 SM7IUN* +0.2 1940 1.000000179 SV8RV +2.1 817 1.000002098 TF3Y -0.6 1187 0.999999434 TF4X -1.9 2718 0.999998095 UA4M +4.2 751 1.000004208 UY2RA -2.0 136 0.999998020 V51YJ +0.5 84 1.000000490 VE2WU* +0.2 691 1.000000196 VE6AO* -0.1 98 0.999999855 VE6JY* +0.2 580 1.000000220 VE6WZ +1.5 462 1.000001524 VE7CC* +0.1 373 1.000000119 VK4CT -2.5 269 0.999997537 VK6ANC -0.4 92 0.999999553 VY0ERC -1.3 95 0.999998723 W1NT* +0.0 1331 1.000000027 W1NT-2* -0.2 1109 0.999999846 W1NT-6* +0.2 1326 1.000000162 W2LB -10.2 112 0.999989844 W3LPL +1.3 1160 1.000001308 W3OA +0.1 99 1.000000143 W3RGA* -0.0 821 0.999999983 W3RGA-3 +0.0 9 1.000000000 W3UA +3.0 1468 1.000002963 W4AX +3.9 170 1.000003889 W4KAZ -0.7 604 0.999999317 W7HR +7.5 43 1.000007459 W8WTS +1.6 375 1.000001623 W8WWV +0.6 773 1.000000571 W9XG +3.4 295 1.000003394 WA3OPY +13.0 46 1.000012980 WA7LNW -1.6 563 0.999998413 WB6BEE* -0.0 489 1.000000000 WE9V +0.0 10 1.000000000 WZ7I* -0.0 1456 0.999999972 ZL4YL +1.2 105 1.000001180 Last updated 2020-08-11 00:10:08 UTC
Historical skimmer frequency accuracy
Historical accuracy data for the past five days. Do not be concerned over minor daily variations. Thanks to the coarse quantization of frequency reports (100Hz steps) the input data is extremely noisy. The typical standard deviation across all shortwave bands is around 3ppm. This means that for a skimmer with 1000 spots per day the statistical variation is around 0.2ppm. For skimmers with under 100 spots per day the statistical variation can be up to 2ppm. The data below is based on the historical content of the above table.
Skimmer 20-08-10 20-08-09 20-08-08 20-08-07 20-08-06 ------------------------------------------------------------- 3B8CW +0.0 -0.1 -0.2 +0.0 -0.2 4X6HP +15.6 +15.8 +15.7 +15.6 +15.7 6K2IXF/2 +0.0 -0.4 -0.3 9A1CIG +8.5 +8.9 +8.9 +6.5 +7.6 9V1RM -1.8 -1.6 -1.3 -2.6 -0.3 AA4VV -0.1 -0.8 -0.1 -0.1 AC0C -0.6 -0.1 -0.2 +0.1 +0.0 BA7KW +2.2 BD7JNA -0.1 -0.2 +0.0 BG4GOV3 -0.9 -0.2 -0.3 -0.3 -0.0 BG8FT +15.1 +15.3 +15.8 +14.7 +14.3 BH1VCS -0.5 -0.9 BH4RRG +0.0 BH4XDZ -0.3 -0.6 BI7JIS +0.3 +0.9 +0.7 CT7ANO -1.2 -5.2 -7.3 CX6VM +0.5 +0.8 +1.1 +0.9 +0.7 DD5XX -1.1 -1.3 -1.5 -1.2 -1.3 DE1LON +0.2 +0.2 +0.2 -0.1 -0.2 DF4XX +1.0 +1.3 +1.5 +1.1 +0.9 DF7GB -0.1 -0.0 DJ2BC +0.1 +0.3 +0.1 -0.3 -0.4 DK0TE +2.9 +3.1 +3.3 +2.8 +2.5 DK3UA +5.2 +5.9 +6.7 +5.1 +5.1 DK9IP -0.0 -0.0 -0.0 +2.5 +11.6 DL1AXX +6.6 +7.2 +7.0 DL3DTH -0.1 +0.1 +0.3 +0.1 +0.0 DL8TG -1.3 -1.2 -1.1 -1.0 DL9GTB +2.6 +3.0 +2.7 +1.8 +1.7 DM6EE +1.6 +0.6 DM7EE -1.0 -1.1 DO4DXA +0.4 +0.3 +0.4 +0.4 +0.3 DQ8Z +8.5 +7.5 +7.4 +8.3 +7.6 DR4W -1.1 -3.2 -2.5 -4.0 EA5WU -0.2 +0.0 -0.0 +0.1 +0.1 EA8/DF4UE +0.1 +0.1 +4.3 +15.1 EA8BFK +0.0 +0.2 +0.1 ES3V +0.6 +0.9 +1.2 +1.0 +0.4 F4VSQ +12.2 F5AHD -0.6 F5UTN +12.6 +12.5 +12.1 +12.7 +12.2 F8DGY -1.0 +0.2 -4.0 -1.3 -0.9 G0KTN -0.0 +0.2 +0.1 G0LUJ +7.1 G4AON +0.9 +1.4 +2.0 G4HSO +2.0 +2.0 +2.2 +1.6 +1.3 G4ZFE -0.1 -0.2 -0.1 -0.1 +0.0 GI4DOH +0.1 +0.2 +0.6 +3.5 +4.5 HA1VHF +1.6 +1.7 +1.8 +1.3 +1.2 HA6PX +2.3 +2.7 +2.5 +1.8 +1.4 HA7GN +5.0 +7.4 +7.6 +7.5 +7.4 HB9BXE +0.6 +0.5 +0.6 +0.4 +0.4 HB9CAT +4.5 +5.2 HB9DCO -5.8 -6.1 -6.1 -5.5 -5.7 HB9JCB +1.4 +1.7 +1.8 +1.5 +1.5 HG2EWS +2.7 +2.7 +2.7 +2.1 +2.4 HS8KVH +3.1 +2.6 +2.8 +2.4 +1.9 IK3STG +1.0 +1.3 +1.4 +1.0 +0.8 IZ2CPS -0.5 -0.2 -0.6 -0.1 -1.6 JA1LZR -1.2 -0.4 -1.3 -1.1 +0.0 JA4ZRK -0.1 -0.0 -0.0 -0.0 +0.0 JG1DLY +0.0 JG1VGX +1.0 +0.4 +0.1 +0.0 +0.7 JH4UTP +1.2 +1.5 +0.8 JH7CSU1 +2.7 +3.3 +3.3 +2.2 +1.7 JI1HFJ +1.8 +2.0 +1.6 +0.8 JJ2VLY +1.2 +1.3 +1.8 +0.9 +1.3 JO1YYP -0.2 -0.1 -0.6 +0.3 +0.1 K1RA +3.5 K1TTT -1.3 -1.6 -1.5 -1.3 -1.5 K2DB +5.7 K3MM +2.4 K3PA -0.1 -0.2 -0.1 -0.0 -0.0 K7EG +1.4 +0.4 +1.6 K9IMM +0.6 +0.7 +0.8 +0.3 +0.0 K9LC -0.2 -0.3 -0.3 -0.3 -0.1 K9TM-4 +0.2 +0.1 +0.2 +0.2 +0.3 KC0VKN +7.0 KC4YVA +2.5 +4.9 KH6LC -1.4 +0.1 +0.0 -0.5 -0.3 KI4PAD -0.7 -1.1 +14.9 +20.2 KL7RA +18.0 +16.6 KM3T -0.0 -0.2 -0.2 -0.1 -0.1 KM3T-2 -0.0 -0.1 +0.0 -0.0 +0.1 KM4SII +1.6 +0.5 +0.3 +1.0 +1.1 KO7SS +0.6 +1.1 +1.3 +0.9 +0.7 KO7SS-7 +1.0 +1.1 +1.2 +0.9 +1.2 KQ8M +1.4 +1.9 +2.0 +2.1 +1.6 KU7T +0.3 +0.2 +0.5 LA6TPA +1.0 +0.1 +1.3 +2.3 +1.5 LZ4AE +1.3 +1.6 +1.8 +1.6 +1.6 LZ4UX -0.2 -0.1 -0.1 -0.1 -0.1 LZ7AA +0.1 +0.2 +0.4 +0.3 +0.4 M0IXY -1.6 N0OI +3.2 +4.4 +3.8 +3.1 +2.0 N5RZ -1.4 -1.7 -1.8 -1.5 -1.4 N6TV +1.0 +0.7 +0.9 +1.2 +0.7 N7TR -1.4 -1.5 -1.7 -1.6 -1.6 N7TUG +0.7 +0.4 +1.0 +0.0 +1.1 N9YKE -9.4 -9.5 -10.2 -10.0 -10.4 NA0B +0.0 +0.2 NC7J +0.6 +0.5 +0.6 +0.5 +0.6 NN3RP -0.0 +0.1 +0.1 +0.0 +0.4 OE9GHV -0.1 -0.2 -0.1 -0.1 -0.1 OH6BG +1.5 +1.7 +1.8 +1.4 +1.3 OK2EW -7.5 -7.5 -7.4 -7.7 OL7M +1.5 +1.6 +1.9 +1.6 +1.5 ON6ZQ +2.3 +2.2 +2.6 +2.0 +1.5 PA1T +15.5 +15.6 +15.3 PA5KT -5.3 PE5TT +3.1 +3.0 PJ2A -2.1 -2.4 -2.1 -1.5 -2.1 R6YY -0.3 -0.4 -0.6 -0.5 -0.8 RK3TD +1.0 +1.0 RL3A-1 +11.7 RN4WA +7.4 +7.4 +7.6 +8.4 +8.3 RU9CZD +1.6 +2.7 +3.5 +2.8 +2.7 S50ARX -10.5 -10.2 -10.0 -10.8 +19.2 S53M +0.6 +0.9 S55OO +3.3 +3.0 +1.8 SE0X +2.8 +3.1 +3.1 +2.4 +2.3 SE5E -0.2 -0.4 -0.5 -0.3 -0.2 SM0TCZ +1.7 +2.0 +2.0 +1.7 +1.7 SM6FMB +4.8 +5.1 +4.9 +4.5 +4.4 SM7IUN +0.2 +0.1 +0.1 +0.2 +0.1 SV8RV +2.1 +2.4 +2.8 +2.8 +1.8 SZ1A -3.0 -3.4 -2.2 -1.8 TF3Y -0.6 -0.7 -0.8 -0.6 -0.7 TF4X -1.9 -2.3 -2.5 -2.0 -2.1 UA4M +4.2 +1.7 +3.1 +0.9 +2.3 UR6EA +1.8 +1.5 UY2RA -2.0 +0.1 +0.2 -2.1 -1.8 V51YJ +0.5 +0.8 +0.9 +0.8 +0.6 VE2WU +0.2 -0.3 -0.2 +0.0 -0.1 VE6AO -0.1 -1.2 -0.8 -0.7 -0.2 VE6JY +0.2 +0.1 +0.3 +0.4 +0.4 VE6WZ +1.5 +1.9 +2.2 +1.3 +2.1 VE7CC +0.1 -0.1 -0.4 -0.2 +0.4 VK2LX +0.0 VK4CT -2.5 -3.2 -2.9 -1.4 -0.9 VK6ANC -0.4 -1.5 -1.2 -1.9 -0.1 VU3KAZ -0.8 VY0ERC -1.3 -2.4 -3.4 -3.1 -3.4 W1NT +0.0 -0.4 -0.5 -0.5 -0.1 W1NT-2 -0.2 -0.4 -0.4 -0.3 -0.2 W1NT-6 +0.2 -0.1 -0.1 +0.0 +0.3 W2LB -10.2 -9.0 -10.0 -12.3 W3LPL +1.3 +1.8 +1.7 +1.1 +1.4 W3OA +0.1 -0.0 +0.1 +0.1 +0.1 W3RGA -0.0 -0.2 -0.1 +0.1 W3RGA-3 +0.0 +0.3 +0.4 W3UA +3.0 +3.2 +3.0 +2.3 +2.3 W4AX +3.9 +4.4 +4.3 +2.9 +4.2 W4KAZ -0.7 -1.0 -1.0 -0.7 -0.6 W7HR +7.5 +7.5 +7.4 +7.3 +7.5 W8WTS +1.6 +2.1 +2.1 +1.8 +2.1 W8WWV +0.6 +0.5 +0.7 +0.6 +0.9 W9XG +3.4 +4.4 +4.2 +2.9 +3.6 WA2ZYU +1.9 WA3OPY +13.0 +12.1 +12.2 +13.0 +12.6 WA7LNW -1.6 -1.6 -1.6 -1.4 -1.1 WA9VEE +0.0 WB4RFQ +0.0 WB6BEE -0.0 -0.2 -0.1 +0.1 -0.0 WE9V +0.0 +0.8 +1.4 +0.0 -0.4 WZ7I -0.0 -0.2 -0.2 -0.1 -0.0 ZL3X +10.7 +9.4 +10.2 ZL4YL +1.2 +1.5 +1.7 +1.5 +1.9 Last updated 2020-08-11 00:10:12 UTC
Activity statistics
Summary of unique calls spotted and active skimmers per band and continent.
RBN data between 2020-08-10 00:00:00 and 2020-08-10 23:59:59.
169182 spots with 5945 unique callsigns from 143 active skimmers.
Unique callsigns spotted per continent and band
---------------------------------------------------------------
160m 80m 60m 40m 30m 20m 17m 15m 12m 10m 6m
AF 0 7 0 38 10 21 8 6 2 4 1 69
AS 4 80 0 386 94 193 38 42 3 16 21 676
EU 60 553 83 1297 566 1302 156 71 17 92 35 3149
NA 19 178 8 936 306 722 77 45 19 82 31 1853
OC 9 12 2 65 8 25 6 6 0 0 0 106
SA 2 6 0 21 9 57 8 6 2 3 1 92
94 836 93 2743 993 2320 293 176 43 197 89
Active skimmers per continent and band
---------------------------------------------------------------
160m 80m 60m 40m 30m 20m 17m 15m 12m 10m 6m
AF 2 3 1 3 3 3 3 2 1 1 1 3
AS 5 9 0 15 8 12 9 11 2 5 4 16
EU 40 49 13 55 47 54 33 41 11 36 9 60
NA 30 41 10 49 29 47 22 34 12 25 5 57
OC 4 3 1 5 3 5 1 2 0 0 0 5
SA 2 2 0 0 1 2 2 2 1 1 0 2
83 107 25 127 91 123 70 92 27 68 19
Last updated 2020-08-11 00:10:26 UTC