NCDXF/IARU Beacons help both amateur and commercial high-frequency radio users assess the current condition of the ionosphere. Each beacon transmits every three minutes, day and night. This table gives the minute and second of the start of the first transmission within the hour for each beacon on each frequency. A transmission consists of the callsign of the beacon sent at 22 words per minute followed by four one-second dashes. The callsign and the first dash are sent at 100 watts. The remaining dashes are sent at 10 watts, 1 watt and 100 milliwatts.


CALLSIGN
LOCATION
14.100 MHz
18.110 MHz
21.150 MHz
24.930 MHz
28.200 MHz
4U1UN
United Nations (New York)
00:00
00:10
00:20
00:30
00:40
VE8AT
Canada
00:10
00:20
00:30
00:40
00:50
W6WX
United States (California)
00:20
00:30
00:40
00:50
01:00
KH6WO
HawaiI
00:30
00:40
00:50
01:00
01:10
ZL6B
New Zealand
00:40
00:50
01:00
01:10
01:20
VK6RBP
Australia
00:50
01:00
01:10
01:20
01:30
JA2IGY
Japan
01:00
01:10
01:20
01:30
01:40
RR9O
Russia (West Siberia)
01:10
01:20
01:30
01:40
01:50
VR2B
Hong Kong
01:20
01:30
01:40
01:50
02:00
4S7B
Sri Lanka
01:30
01:40
01:50
02:00
02:10
ZS6DN
South Africa
01:40
01:50
02:00
02:10
02:20
5Z4B
Kenya
01:50
02:00
02:10
02:20
02:30
4X6TU
Israel
02:00
02:10
02:20
02:30
02:40
OH2B
Finland
02:10
02:20
02:30
02:40
02:50
CS3B
Madeira
02:20
02:30
02:40
02:50
00:00
LU4AA
Argentina
02:30
02:40
02:50
00:00
00:10
OA4B
Peru
02:40
02:50
00:00
00:10
00:20
YV5B
Venezuela
02:50
00:00
00:10
00:20
00:30