RBN Analytics

Skimmer frequency accuracy

To be a good RBN citizen a skimmer should have a frequency accuracy of 2ppm or better.

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

The data listed here is based on archived RBN data from the previous day, UTC time. When making adjustments, this means that changes in calibration will not have full impact on the listed data until the second day after the change.

The deviation estimates listed below are based on spots on all active bands from the respective skimmer. If different hardware is used for different bands, the deviation number may thus not represent the actual deviation for a particular band.

The software used to calculate the tables below can be found here. It runs as a cron job in an Ubuntu container on my server and uploads to this WordPress site ten minutes after midnight UTC every night.

The calculation of deviation estimates is done in two stages. The first stage uses a small number of highly accurate skimmers (called “anchor skimmers” in the code) as reference skimmers. The whole estimation process is then repeated but using the anchor skimmers plus all skimmers with 0.2ppm or less deviation from the anchors as reference skimmers. This way the number of qualifying spots is drastically increased, leading to much more reliable estimates for all skimmers. All skimmers used as reference skimmers in the second stage are marked with an asterisk in the table below.

Due to propagation characteristics and statistical variations some skimmers selected as reference skimmers in the first stage may have more than 0.2ppm deviation in the second stage. This is not an error.

314117 RBN spots between 2021-01-26 00:00 and 23:59 UTC.
64213 spots (20.4%) were from reference skimmers (*).
Average spot flow was 218 per minute from 176 active CW skimmers.

142577 spots from 169 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       +0.4    145   1.000000443
  3D2AG       +0.1     58   1.000000082
  3V/KF5EYY   +0.3   1173   1.000000316
  5W1SA       +0.0     20   1.000000000
  7N4XCV      +1.3     16   1.000001337
  9A1CIG      +3.9    298   1.000003949
  9V1RM       -1.3     16   0.999998663
  AC0C-1*     -0.0   1380   0.999999990
  BD7LMD      -4.8     48   0.999995244
  BD7MLA      +1.2    155   1.000001229
  BY1CY       +1.2      8   1.000001189
  CE6MOA     -20.2     12   0.999979795
  CX6VM       +0.1    436   1.000000122
  DD5XX       +0.5    971   1.000000466
  DE1LON      -1.6   1267   0.999998431
  DF4XX       +0.4    876   1.000000359
  DF7GB       +0.4   1255   1.000000362
  DJ2BC*      -0.2   1249   0.999999772
  DK0TE       +1.5   1171   1.000001510
  DK3UA       +0.5    458   1.000000524
  DK3WW       +0.3     98   1.000000347
  DK9IP       +0.3   1270   1.000000322
  DL0PF       +1.7   1916   1.000001675
  DL3DTH      +0.7   1614   1.000000689
  DL8LAS      -2.9   1571   0.999997148
  DL8TG*      -0.5    785   0.999999545
  DL9GTB      +0.9   1547   1.000000865
  DM6EE       -4.2   1573   0.999995826
  DM7EE       -3.9   1127   0.999996077
  DO4DXA*     +0.1    576   1.000000140
  DR4W*       -0.1   1614   0.999999947
  E28AC       +1.5    124   1.000001515
  EA1URA      +0.2   1546   1.000000236
  EA5WU*      +0.1   1984   1.000000148
  EA8/DF4UE   +0.2   2039   1.000000241
  ES3V        -0.8    567   0.999999170
  ET3AA       +0.2     46   1.000000155
  F6IIT*      -0.2   2341   0.999999751
  G0KTN       +0.5   1154   1.000000533
  G0LUJ       -0.8    637   0.999999152
  G4AON       +1.6    231   1.000001592
  G4HSO       +0.3    339   1.000000281
  G4ZFE       +0.4    699   1.000000381
  GI4DOH      +0.9    808   1.000000895
  GM6DX*      -0.3    244   0.999999652
  HA1VHF      -1.0   1160   0.999999002
  HA6PX       -2.2   1391   0.999997801
  HA7GN       -0.6    456   0.999999437
  HA8TKS      +0.5    295   1.000000531
  HB9BXE      +0.9    764   1.000000910
  HB9DCO     -24.3   1433   0.999975703
  HB9JCB      +1.6   1268   1.000001576
  HS8KVH      +2.8    178   1.000002797
  IK3STG      -1.3    871   0.999998682
  IK4VET-1*   +0.0   2029   1.000000021
  IZ2CPS      -0.9    667   0.999999062
  JA4ZRK      +0.0     10   1.000000000
  JH7CSU1     +2.6     82   1.000002561
  JJ2VLY      -3.7     66   0.999996327
  JQ1BVI      +0.3     71   1.000000301
  JR1BFZ/2    +0.3     17   1.000000325
  K1FC        -1.4     21   0.999998649
  K1TTT*      -0.0   1790   0.999999968
  K2DB        +0.8   1276   1.000000831
  K2PO/7      +0.6    721   1.000000628
  K3LR        +0.2   1197   1.000000212
  K7EG        +0.7    467   1.000000677
  K7MJG       -1.5    237   0.999998474
  K9IMM*      +0.1   1562   1.000000131
  K9LC*       +0.2   1373   1.000000206
  K9TM-4      +0.7   1179   1.000000665
  KC0VKN      -0.9    391   0.999999079
  KC4YVA      +3.8    347   1.000003821
  KD2OGR*     +0.1    743   1.000000063
  KD7YZ*      +0.1   1692   1.000000122
  KI4PAD      -2.3    193   0.999997659
  KM3T*       +0.1   2453   1.000000087
  KM3T-1*     +0.3    363   1.000000274
  KM3T-2*     +0.1   2119   1.000000127
  KO7SS       -2.8   1759   0.999997198
  KO7SS-7*    -0.0    901   0.999999961
  KP2RUM*     -0.1   1143   0.999999871
  KU7T*       -0.3   1025   0.999999693
  KV4TT*      +0.0    881   1.000000045
  LA6TPA      +0.5    213   1.000000515
  LZ2ZG       +2.2    224   1.000002232
  LZ3CB*      +0.5    867   1.000000464
  LZ3ZZ      +14.3    426   1.000014293
  LZ4AE       +0.4   1400   1.000000391
  LZ4UX       +0.3    981   1.000000258
  LZ7AA       +0.3    923   1.000000301
  M5ADL       +3.1    250   1.000003050
  N0OI        +1.2    252   1.000001206
  N4ZR/3*     +0.1    678   1.000000120
  N5RZ        +0.5   1813   1.000000511
  N6TV*       +0.1    519   1.000000141
  N6WIN-7     -2.7   1547   0.999997292
  N7TUG*      -0.4     69   0.999999587
  NA0B        +1.7     17   1.000001672
  NC7J*       +0.2    889   1.000000226
  NN3RP*      -0.1    422   0.999999943
  NU6XB       -3.5    463   0.999996526
  NX5M        +0.6    662   1.000000602
  OE9GHV      +0.3   2222   1.000000342
  OH4KA       +4.4    793   1.000004434
  OH6BG       +0.8   1168   1.000000781
  OH8X        +1.1   1319   1.000001100
  OK2EW       -0.3   1721   0.999999684
  OL7M*       -0.2   2075   0.999999828
  OM8AW       -1.4   1172   0.999998565
  ON6ZQ       +1.5   1301   1.000001533
  PA0MBO      +0.0      9   1.000000000
  PA3AIN     -19.8      6   0.999980230
  PJ2A        -1.5    891   0.999998488
  PY1CG*      +0.6    140   1.000000560
  R1LB        +0.9    236   1.000000905
  R6YY        +1.5    449   1.000001466
  RL3A-2      +1.1    697   1.000001063
  RN4WA*      +0.1    486   1.000000143
  RU9CZD      +1.7    503   1.000001701
  S50ARX      +1.1    473   1.000001101
  S50U        +1.6    359   1.000001573
  SE5E        -0.6   1684   0.999999388
  SJ2W        +1.0   1706   1.000001048
  SM0TCZ      +0.6    128   1.000000612
  SM6FMB*     +0.5    444   1.000000519
  SM7IUN      -1.7   1431   0.999998301
  SP5SR       +0.0     33   1.000000000
  SP6FCS      +0.3    115   1.000000344
  SV8RV       +3.3    647   1.000003296
  TF3Y*       -0.4    799   0.999999624
  TF4X        -1.9   2075   0.999998064
  UA4M        +3.8   1298   1.000003760
  UY2RA       +0.5    299   1.000000488
  V51YJ       +0.6     72   1.000000610
  VE2WU       +0.6    406   1.000000650
  VE3NZ       +1.5    890   1.000001451
  VE6AO       -3.0    335   0.999996994
  VE6WZ       +1.5   1041   1.000001517
  VE7CC*      +0.3    780   1.000000296
  VK3RASA    -10.4     68   0.999989559
  VK4CT       -0.3    338   0.999999662
  VK6ANC      -1.1    132   0.999998941
  W1NT-2      -0.7   1775   0.999999266
  W1NT-6      -0.6   2463   0.999999356
  W2AXR       +1.7   1904   1.000001739
  W2NAF       +0.9   1968   1.000000904
  W3LPL       +0.9   2138   1.000000851
  W3OA*       +0.1   1168   1.000000081
  W3OA-2*     -0.1    188   0.999999865
  W3RGA*      +0.1   1426   1.000000108
  W3UA        +1.6   1879   1.000001604
  W4AX        +3.6    374   1.000003617
  W6BB        -3.4    220   0.999996624
  W7HR        +0.6    234   1.000000640
  W8WWV       +0.6   1464   1.000000574
  W9XG        +4.0    695   1.000003973
  WA3OPY     +11.7     39   1.000011675
  WA7LNW      -1.9   1491   0.999998140
  WA9VEE      +0.0      8   1.000000000
  WB6BEE*     +0.0   1252   1.000000034
  WC2L        +0.2    756   1.000000245
  WE9V*       -0.3   1574   0.999999714
  WH7W        -0.4    345   0.999999625
  WS3W       -22.2   1103   0.999977759
  WZ7I        +0.0   2457   1.000000012
  ZL2BR       +1.3     38   1.000001314
  ZL4YL       +1.6    168   1.000001613
  ZS6BNE      +1.5     29   1.000001476

Last updated 2021-01-27 00:10:13 UTC

Historical skimmer frequency accuracy

Below you will find historical accuracy data for the past five days. Do not be concerned over minor daily variations. Since RBN spots only have 100Hz frequency accuracy, the input data is very noisy. Even for a perfectly accurate skimmer, the typical RMS rounding error across all shortwave bands is around 3ppm. This means that for a skimmer with 1000 spots per day the statistical variation is up to 0.2ppm. For skimmers with less than 100 spots per day the statistical variation can be above 2ppm. The content of the table below is based on the historical content of the above table.

Skimmer      21-01-26  21-01-25  21-01-24  21-01-23  21-01-22
-------------------------------------------------------------
3B8CW          +0.4      +0.4      +0.4      +0.3      -0.1
3D2AG          +0.1      +0.5      -4.5      -0.2      -1.2
3V/KF5EYY      +0.3      +0.4      +0.1      +0.1      -0.1
5W1SA          +0.0      +0.0                +0.6      +0.5
7N4XCV         +1.3      +0.4                              
9A1CIG         +3.9      +3.5      +3.2      +3.3      +3.0
9V1RM          -1.3      -1.6      -1.4      -1.8      -1.3
AC0C-1         -0.0      +0.0      -0.1      -0.1      +0.1
BD7JNA                             -3.4      +0.4      -2.4
BD7LLL                   +1.5      +0.1      +0.6      +0.3
BD7LMD         -4.8      -5.8      -4.2      -4.5      -4.1
BD7MLA         +1.2      +0.9      +1.1      +1.4      +1.4
BG4GOV                             -7.1                    
BH1VCS                   +0.0                              
BH4RRG-1                 +1.6      +5.3      +5.5      +4.8
BU2EQ                    +1.3      +0.0      +1.0          
BY1CY          +1.2                                        
CE6MOA        -20.2     -17.6     -21.2     -16.5     -18.2
CX6VM          +0.1      +0.1      -0.3      -0.1      -0.1
DD0VS                              +0.3      -0.9          
DD5XX          +0.5      +0.6      +0.2      +0.2      +0.2
DD5XX-3                                                +0.0
DE1LON         -1.6      -1.1      -2.1      -1.3      -1.9
DF2CK                   +13.1                              
DF4XX          +0.4      -0.0      -0.4      -0.7      -0.4
DF7GB          +0.4      +0.3      +0.0      -0.1      +0.0
DJ2BC          -0.2      -0.1      -1.1                    
DK0TE          +1.5      +1.7      +1.9      +1.9      +1.4
DK3UA          +0.5      +0.3      -0.1      -0.1      -0.2
DK3WW          +0.3      +0.8                          -6.3
DK9IP          +0.3      +0.4      -0.1      +0.0      +0.0
DL0PF          +1.7      +1.6      +0.9      +1.6      +1.0
DL3DTH         +0.7      +0.7      +0.4      +0.4      +0.3
DL8LAS         -2.9      -2.7      -4.9      +0.6      -2.0
DL8TG          -0.5      -0.5      -1.1      -1.0      -1.0
DL9GTB         +0.9      +1.1      +1.3      +1.5      +0.8
DM6EE          -4.2      -3.6      +0.7      +1.7      +0.8
DM7EE          -3.9      -2.7      +0.4      +0.3      +0.2
DO4DXA         +0.1      -0.1      -0.4      -0.3      -0.0
DR4W           -0.1      +0.1      -0.2      +0.4      +0.4
E28AC          +1.5      +1.9      +2.9      +2.4      +1.0
EA1URA         +0.2      +0.1      -0.0      -0.1      -0.1
EA5WU          +0.1      +0.0      -0.2      -0.4      +0.0
EA8/DF4UE      +0.2      +0.1      -0.0      -0.1      -0.0
ES3V           -0.8      -1.0      -1.5      -1.6      -1.7
ET3AA          +0.2      +0.2      +0.6      +0.0      +0.3
F4VSQ                    +5.9      +5.2      +4.9          
F6IIT          -0.2      -0.8      -1.4      -1.1      -0.7
G0KTN          +0.5      +0.5                              
G0LUJ          -0.8      -0.8      -1.7      -1.6      -0.8
G0TMX                              -0.3      +0.2          
G4AON          +1.6      +1.4                          +0.9
G4HSO          +0.3      -0.2      -0.6      +0.1      -0.0
G4SGX                                        +0.9          
G4ZFE          +0.4      +0.4      -0.2      +0.1      -0.0
GI4DOH         +0.9      +1.0      +0.9      +0.9      +0.6
GM6DX          -0.3      -0.4      +0.3      +0.5      +0.2
HA1VHF         -1.0      -0.9      -1.5      -1.4      -1.4
HA5PP                              +1.5                    
HA6PX          -2.2      -1.6      -1.6      -1.5      -1.9
HA7GN          -0.6      -0.3      -0.9      -0.9      -1.0
HA8TKS         +0.5      +0.3      +0.7      +0.7          
HB9BXE         +0.9      +0.9      +0.7      +0.8      +0.4
HB9DCO        -24.3     -23.7      -2.3      +0.3      -0.5
HB9JCB         +1.6      +1.6      +1.7      +1.6      +1.1
HS8KVH         +2.8      +3.8      +4.4      +3.6      +2.7
IK3STG         -1.3      -1.3      -2.3      -2.1      -2.1
IK4VET-1       +0.0      -0.3      -0.4                    
IZ2CPS         -0.9      -1.0      -1.6      -1.4      -1.4
JA4ZRK         +0.0      +0.7      +0.3      +0.4      +0.0
JE1SGH                                       +3.0          
JG1DLY                             -1.0                    
JH7CSU1        +2.6      +2.4      +3.7      +3.1      +2.7
JI1HFJ                             +0.7      +0.5          
JJ2VLY         -3.7      -2.3      -2.5      -4.4      -2.9
JQ1BVI         +0.3      -0.2      -0.2      +0.3      -0.1
JR1BFZ/2       +0.3      -0.7      -0.2      -0.1      -0.8
K1FC           -1.4      -1.4      +0.0                -2.0
K1TTT          -0.0      -0.2      -0.1      -0.1      -0.2
K2DB           +0.8      +0.1      -1.0      +0.2      -1.3
K2PO/7         +0.6      +0.7      +0.8      +0.8      +0.2
K3LR           +0.2      -0.2      +0.7      +0.2      +0.3
K7EG           +0.7      +0.7      +0.6      +1.0      +0.3
K7MJG          -1.5      -1.3      -0.1      -6.8     -10.2
K9IMM          +0.1      +0.0      +0.2      +0.0      +0.0
K9LC           +0.2      +0.1      +0.1      -0.0      -0.0
K9TM-4         +0.7      +0.6      +0.8      +0.9      +0.5
KC0VKN         -0.9      -1.0      -1.5      -2.1      -1.0
KC4YVA         +3.8      +4.2      +4.1      +4.8      +3.8
KD2OGR         +0.1      +0.0      +0.1      -0.0      +0.2
KD7YZ          +0.1      +0.1      +0.1      +0.1      +0.1
KI4PAD         -2.3      -2.8      -3.6      -4.1      -3.0
KM3T           +0.1      +0.2      +0.1      -0.0      +0.1
KM3T-1         +0.3      +0.1      +0.3      +0.1      +0.0
KM3T-2         +0.1      +0.0      -0.2      -0.0      +0.0
KM4SII                                       +0.1          
KO7SS          -2.8      -1.2      +0.1      +0.5      -0.0
KO7SS-7        -0.0      +0.0      +0.0      -0.2      -0.0
KP2RUM         -0.1      -0.1      -0.3      -0.2      -0.1
KQ8M                     +0.4      -0.0      +0.3      +1.1
KU7T           -0.3      -0.5      -0.4      -0.6      -0.2
KV4TT          +0.0      +0.2      +0.2      +0.2      +0.2
LA6TPA         +0.5      +0.3      +0.2      +0.1      +0.8
LY2XW                              +0.4      +0.7          
LZ2ZG          +2.2      +3.1      +3.8      +4.3      +2.4
LZ3CB          +0.5      +0.3      +0.1      -0.0      +0.1
LZ3ZZ         +14.3     +11.7      +6.8                    
LZ4AE          +0.4      +0.6      +1.3      +1.3      +0.7
LZ4UX          +0.3      +0.1      +0.1      +0.2      -0.1
LZ5DB-2                  +1.0      +0.3                    
LZ7AA          +0.3      +0.3      +0.0                    
M5ADL          +3.1      +1.9      +2.5      +0.0      -0.2
N0OI           +1.2      +4.6      +3.6      +5.2      +4.1
N4ZR/3         +0.1      -0.1      -0.4      -0.2      -0.0
N5RZ           +0.5      -0.6      -1.8      -2.3      -1.9
N6TV           +0.1      +0.1      +0.0      -0.1      -0.0
N6WIN-7        -2.7      -2.2      -1.9      -2.0      -1.2
N7TUG          -0.4      -0.2      -0.1      -0.7      -0.3
NA0B           +1.7      +0.6      +0.3      -0.3      +0.0
NC7J           +0.2      +0.3      +0.4      +0.4      +0.3
NH6V                                         +0.0      -0.3
NN3RP          -0.1      +0.0      -0.2      -0.0      -0.2
NU6XB          -3.5      -3.2      -3.6      -3.4      -2.8
NX5M           +0.6      +0.9      +0.5      +0.5      +0.2
OE6ADD                             +0.2      -0.2      +0.1
OE9GHV         +0.3      +0.3      -0.0      -0.0      +0.1
OH2BBT                  +13.1                              
OH4KA          +4.4      +4.3      +4.8      +4.5      +2.8
OH6BG          +0.8      +0.7      +0.6      +0.7      +0.5
OH8X           +1.1      +1.2      +1.0      +0.9      +0.6
OK2EW          -0.3      -0.2      -1.1      -0.8      -0.8
OL7M           -0.2      +0.0      -0.3      -0.2      -0.3
OM8AW          -1.4      -1.2      -1.4      -1.1      -1.5
ON6ZQ          +1.5      +1.2      +0.5      +1.0      +0.7
PA0MBO         +0.0      +0.5      +0.3      +0.1      +0.1
PA3AIN        -19.8     +34.9     +14.2     -36.6          
PA5KT                              -1.9      -1.1          
PJ2A           -1.5      -1.4      -2.2      -2.1      -1.5
PR1T                               -1.2      -1.5      -1.2
PS8CW                             +13.4     +11.8          
PY1CG          +0.6      +0.1                              
R1LB           +0.9      +1.4      +2.0      +1.8      +1.0
R6YY           +1.5      +1.7      +1.2      +1.2      +0.6
RL3A-2         +1.1      +1.3      +1.2      +1.1      +0.4
RN4WA          +0.1      -0.0      -0.4      -0.4      -0.4
RU9CZD         +1.7      +1.5      +2.5      +2.2      +1.8
S50ARX         +1.1      +1.2      +1.4      +1.2      +0.6
S50U           +1.6      +1.3      +2.0      +1.6      +1.3
S53M                               -7.9                    
SE5E           -0.6      -0.4      -1.0      -0.9      -0.7
SJ2W           +1.0      +0.8      +0.7      +0.7      +0.7
SM0TCZ         +0.6      +0.6      +1.6      +1.8      +1.2
SM6FMB         +0.5      +0.1      -0.2      -0.1      -0.2
SM7IUN         -1.7      -1.4      +0.1      +0.1      +0.1
SP5SR          +0.0      -1.5      +1.1      +0.5      +0.6
SP6FCS         +0.3                                        
SV1CDN                             -0.3                    
SV8RV          +3.3      +3.0      +3.1      +2.8      +2.5
SZ1A                               -6.1      -5.9      -5.5
TF3Y           -0.4      -0.6      -0.9      -0.8      -0.8
TF4X           -1.9      -2.3      -2.4      -2.4      -2.0
UA4M           +3.8      +4.1      +3.9      +3.8      +1.8
UY2RA          +0.5      -0.2                              
V51YJ          +0.6      +1.2      +1.0      +1.5          
VE2WU          +0.6      -0.7      -1.0      -0.1      +0.6
VE3NZ          +1.5      +1.5      +0.9      +1.3      +1.6
VE6AO          -3.0      -3.1      -2.0      -2.8      -2.8
VE6WZ          +1.5      +1.3      +1.4      +1.7      +1.1
VE7CC          +0.3      +0.2      +0.3      +0.1      +0.0
VK2GEL                   -7.4      +2.5      +3.6          
VK3RASA       -10.4      -8.7                          -7.2
VK4CT          -0.3      -0.6      -0.3      -1.0      -0.7
VK6ANC         -1.1      -0.4      -0.6      -0.9      -0.3
VU3KAZ                             -0.6      -0.5          
VY0ERC                                       -2.5          
W1NT-2         -0.7      -1.0      -1.0      -1.2      -0.9
W1NT-6         -0.6      -0.8      -1.0      -0.9      -0.9
W2AXR          +1.7      +1.8      +1.6      +1.7      +1.2
W2LB                               +1.2      +0.8      -0.6
W2NAF          +0.9      +0.7      +0.7      +0.8      +0.6
W3LPL          +0.9      +1.0      +0.9      +1.0      +0.6
W3OA           +0.1      -0.1      -0.2      -0.2      -0.1
W3OA-2         -0.1      -0.1      -0.3      -0.0      -0.0
W3RGA          +0.1      +0.2      +0.0      +0.2      -0.0
W3UA           +1.6      +1.6      +1.8      +1.9      +1.6
W4AX           +3.6      +3.8      +4.0      +3.6      +3.1
W6BB           -3.4      -3.1      -2.9      -3.9      -2.0
W7HR           +0.6      +1.0      +0.8      +1.3      +0.5
W8WTS                                        -0.6      -1.0
W8WWV          +0.6      +0.5      +0.6      +0.5      +0.4
W9XG           +4.0      +4.0      +3.3      +3.4      +3.6
WA3OPY        +11.7     +11.5     +11.8      +9.9     +12.9
WA7LNW         -1.9      -1.5      -1.6      -1.4      -0.9
WA9VEE         +0.0      +0.0                              
WB6BEE         +0.0      +0.2      -0.0      -0.0      +0.1
WC2L           +0.2      +0.0      -0.2      -0.3      -0.2
WE9V           -0.3      -0.5      +0.4      +0.1      -0.1
WH7W           -0.4      -0.7     +19.5     +24.4     +23.9
WS3W          -22.2     -15.3     +11.5      +3.5      -2.0
WZ7I           +0.0      +0.1      -0.1      -0.1      -0.1
YO4SVZ                                      -12.5          
ZL2BR          +1.3      +1.1      +0.6      +0.9      +0.3
ZL4YL          +1.6      +1.3      +0.9      +1.7      +0.7
ZS6BNE         +1.5      +1.8      +1.8      +1.6      +1.8

Last updated 2021-01-27 00:10:18 UTC

Activity statistics

Summary of unique calls spotted and active skimmers per band and continent.

RBN activity between 2021-01-26 00:00 and 23:59 UTC.
314117 spots with 8036 unique callsigns from 189 active skimmers.

        Unique callsigns spotted per continent and band
---------------------------------------------------------------
    160m  80m  60m  40m  30m  20m  17m  15m  12m  10m   6m
AF     3   20    3   38    7   38    9   12    3    2    1  104
AS    55  150    2  337   36  159   49   42    8    3    4  664
EU   373 1137  155 1663  500 1501  332  235   33   82    8 4310
NA   156  538   39 1323  304  780  242  183   52  101    7 2685
OC     3   16    1   68   15   40   12   21    2    2    0  130
SA     1    2    0   87    5   43   11   14    5   12    0  143
     591 1863  200 3516  867 2561  655  507  103  202   20

        Active skimmers per continent and band
---------------------------------------------------------------
    160m  80m  60m  40m  30m  20m  17m  15m  12m  10m   6m
AF     3    4    1    5    5    5    5    5    2    3    0    6
AS    10   13    0   16   10   17    8   15    3    2    1   17
EU    69   75   23   78   66   67   46   54   11   31    4   85
NA    50   54   17   60   42   58   35   48   24   39    2   67
OC     2    7    1    8    7    9    6    8    2    2    1   10
SA     2    1    0    3    2    4    3    4    1    2    0    4
     136  154   42  170  132  160  103  134   43   79    8

Last updated 2021-01-27 00:10:45 UTC