RBN Analytics

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