Radiovibrations.com

Offset DX

AM FREQUENCIES IN FOCUS

by Peer-Axel Kroeske, DL2LBP
Can you imagine chasing radio signals without hearing a sound? This site is about minimal deviations of AM carriers from the nominal frequency. With spectrum analyzers you can make dozens of carriers visible on each frequency. And suddenly medium wave is full of signals from other continents. Analyzing offsets can help to identify inferior signals and learn about propagation.

24h waterfall diagrams received in Handewitt, Germany

with Perseus SDR receiver and ALA 1530S antenna using DL4YHF's genuine and free Spectrum Lab software.
10K steps

(America)
610 KHz02/03/2016 12-20 UTC 9840-0145
02/03/2016 23-00 UTC 9840-0145
03/03/2016 00-0730 UTC 9840-0145
03/03/2016 0730-12 UTC 9840-0145
03/03/2016 20-21 UTC 9840-0145
03/03/2016 21-05 UTC 9840-0145
18/12/2016 12-20 UTC 9852-0147
18/12/2016 20-04 UTC 9852-0147
19/12/2016 04-12 UTC 9852-0147
650 KHz13/12/2016 06-12 UTC 9694-0304
13/12/2016 12-20 UTC 9694-0304
13/12/2016 20-04 UTC 9694-0305
14/12/2016 04-07 UTC 9694-0305
680 KHz15/12/2016 07-08 UTC 9698-0308
15/12/2016 08-16 UTC 9698-0308
15/12/2016 16-00 UTC 9698-0308
16/12/2016 00-08 UTC 9698-0308
16/12/2016 08-16 UTC 9698-0308
16/12/2016 16-19 UTC 9698-0308
770 KHz14/12/2016 08-16 UTC 9694-0305
14/12/2016 16-00 UTC 9694-0305
820 KHz27/12/2016 17-00 UTC 9847-0153
28/12/2016 00-08 UTC 9846-0151
28/12/2016 06-14 UTC 9375-0615
28/12/2016 08-14 UTC 9846-0151
28/12/2016 08-16 UTC 9375-0615
28/12/2016 2135-0435 UTC 9685-0305
with analysis
850 KHz28/12/2016 1630-0000 UTC 9693-0304
29/12/2016 00-08 UTC 9693-0304
29/12/2016 07-14 UTC 9387-0609
29/12/2016 08-14 UTC 9693-0304
930 KHz14/11/2009
27/01/2015 1430-0430 UTC 9817-0122
27/01/2015 19-05 UTC 936-058
27/01/2015 1940-0430 UTC 9894-0046
27/01/201507
27/01/201508
28/01/2015 0145-0830 UTC 9817-0122
28/01/2015 0830-2330 UTC 9817-0122
with analysis
1200 KHz08/01/2015 00-01 UTC 989-012
08/01/2015 01-02 UTC 989-012
08/01/2015 02-03 UTC 989-012
08/01/2015 03-04 UTC 989-012
08/01/2015 04-05 UTC 989-012
1390 KHz12/12/2016 08-12 UTC 9665-0275
12/12/2016 12-20 UTC 9665-0275
12/12/2016 20-04 UTC 9664-0275
13/12/2016 04-05 UTC 9665-0275
1510 KHz30/01/2015 14-18 UTC 969-031
31/01/2015 18-09 UTC 969-031
1610 KHz22/01/2017 22-04 UTC 9694-0305
23/01/2017 00-08 UTC 9694-0305
23/01/2017 08-11 UTC 9695-0305
1640 KHz27/01/2017 16-00 UTC 9694-0305
28/01/2017 00-08 UTC 9694-0305
28/01/2017 08-10 UTC 9694-0305
1690 KHz06/01/2017 22-00 UTC 9389-0610
07/01/2017 00-08 UTC 9389-0610
07/01/2017 08-16 UTC 9389-0610
9 KHz steps

(Eu/Asia/Afr/Oce)
531 KHz19/12/2016 16-20 UTC 9847-0153
19/12/2016 19-11 UTC 9847-0153
with analysis
540 KHz02/02/2011 08-17 UTC 983-021
02/02/2011 19-00 UTC 983-021
549 KHz21/12/2016 04-12 UTC 9857-0131
21/12/2016 12-20 UTC 9857-0131
21/12/2016 20-04 UTC 9858-0133
with analysis
567 KHz02/01/2017 00-08 UTC 9693-0304
02/01/2017 08-16 UTC 9693-0304
02/01/2017 16-00 UTC 9693-0304
594 KHz03/01/2017 08-16 UTC 9693-0304
03/01/2017 16-00 UTC 9693-0304
04/01/2017 00-08 UTC 9693-0304
04/01/2017 08-12 UTC 9693-0304
603 KHz04/01/2017 08-16 UTC 9693-0304
04/01/2017 16-00 UTC 9693-0304
05/01/2017 00-08 UTC 9693-0304
612 KHz05/01/2017 12-20 UTC 9693-0304
05/01/2017 20-04 UTC 9693-0304
06/01/2017 04-12 UTC 9693-0304
06/01/2017 11-19 UTC 9693-0304
06/01/2017 12-19 UTC 9693-0304
675 KHz16/12/2016 19-20 UTC 9697-0309
16/12/2016 20-04 UTC 9697-0309
17/12/2016 04-12 UTC 9697-0309
17/12/2016 12-15 UTC 9697-0309
17/12/2016 12-20 UTC 9852-0152
17/12/2016 20-04 UTC 9852-0152
18/12/2016 00-08 UTC 9852-0152
765 KHz10/01/2014
10/01/2014w
23/06/2014
with analysis
891 KHz20/01/2017 00-08 UTC 9692-0303
20/01/2017 08-16 UTC 9692-0303
20/01/2017 16-00 UTC 9692-0303
20/01/2017 23-07 UTC 9692-0303
with analysis
900 KHz21/01/2017 07-08 UTC 9691-0302
21/01/2017 08-16 UTC 9691-0302
21/01/2017 16-00 UTC 9691-0302
22/01/2017 00-08 UTC 9691-0302
22/01/2017 08-09 UTC 9691-0302
963 KHz07/03/2016 06-12 UTC 9848-0154
07/03/2016 12-20 UTC 9696-0306
07/03/2016 20-04 UTC 9848-0154
08/03/2016 04-06 UTC 9848-0154
1062 KHz08/03/2016 06-12 UTC 9696-0316
08/03/2016 12-20 UTC 9696-0316
08/03/2016 21-04 UTC 9696-0316
1377 KHz04/03/2016 05-12 UTC 9840-0135
04/03/2016 12-20 UTC 9833-0128
04/03/2016 22-04 UTC 9834-0129
05/03/2016 04-07 UTC 9834-0129
05/03/2016 14-18 UTC 9834-0129
05/03/2016 18-22 UTC 9834-0129
1386 KHz05/03/2016 16-00 UTC 9848-0154
06/03/2016 00-08 UTC 9848-0154
06/03/2016 08-10 UTC 9848-0154
06/03/2016 08-16 UTC 9848-0154
1395 KHz18/01/2017 00-01 UTC 9692-0303
18/01/2017 01-09 UTC 9692-0303
18/01/2017 09-17 UTC 9692-0303
18/01/2017 17-23 UTC 9692-0303
1467 KHz18/01/2017 22-00 UTC 9692-0303
19/01/2017 00-08 UTC 9692-0303
19/01/2017 08-16 UTC 9692-0303
19/01/2017 15 UTC-23 UTC 9692-0303
1476 KHz17/12/2014 14-20 UTC 9851-0156
17/12/2014 20-03 UTC 9851-0156
18/12/2014 03-06 UTC 9851-0156
1485 KHz07/01/2017 16-20 UTC 9694-0305
07/01/2017 20-04 UTC 9694-0305
08/01/2017 04-12 UTC 9694-0305
1584 KHz06/03/2016 10-18 UTC 9696-0306
06/03/2016 16-00 UTC 9848-0154
06/03/2016 19-21 UTC 9696-0306
06/03/2016 21-05 UTC 9696-0306
1620 KHz25/01/2017 16-00 UTC 9689-0300
26/01/2017 00-08 UTC 9689-0300
26/01/2017 08-16 UTC 9689-0300

Background info and more

The radio spectrum

Introduction part 1 Introduction part 2

FM band offsets

FM deviations MPX-DX deviations of the 19 KHz stereo subcarrier reveal details about signal distribution and help to identify the signals

TV-carrier DX

The analog TV spectrum

Tools

Offset calculator when you have two reference frequencies (for measuring with uncalibrated WebSDRs using LSB/USB)

930 KHz

waterfall from 2009 with remarks and explanations