hfdl.observer

high frequency data link

Ground Stations

Live status of HFDL ground stations and the frequencies they are currently listening and heard on. This can be used to help you tune your HFDL decoder at this exact moment. Frequencies in kHz.
IDNameUpdated
2
Molokai, Hawaii
📌 21.184428, -157.186846
2026-01-21T23:29:43+00:00
11348
13324
21937
9
Barrow, Alaska
📌 71.25849, -156.577447
2026-01-21T23:28:30+00:00
10093
1
San Francisco, California
📌 38.384587, -121.759647
2026-01-21T23:30:05+00:00
17919
21934
11
Albrook, Panama
📌 9.084681, -79.373969
2026-01-21T23:19:52+00:00
10063
4
Riverhead, New York
📌 40.881922, -72.63762
2026-01-21T23:27:25+00:00
11387
13276
13
Santa Cruz, Bolivia
📌 -17.671199, -63.157088
2026-01-21T22:54:22+00:00
17916
21997
3
Reykjavik, Iceland
📌 63.847168, -22.455754
2026-01-21T23:26:53+00:00
5720
8977
11184
17
Canarias, Spain
📌 27.960945, -15.405608
2026-01-21T23:29:43+00:00
13303
17928
7
Shannon, Ireland
📌 52.744089, -8.926752
2026-01-21T23:28:10+00:00
8942
10081
8
Johannesburg, South Africa
📌 -26.129658, 28.206078
2026-01-21T23:28:30+00:00
4681
8834
15
Al Muharraq, Bahrain
📌 26.268773, 50.648978
2026-01-21T23:30:05+00:00
10030
13312
14
Krasnoyarsk, Russia
📌 56.152603, 92.583337
2026-01-21T23:29:33+00:00
5622
6
Hat Yai, Thailand
📌 6.937536, 100.388451
2026-01-21T23:28:10+00:00
6535
13270
10
Muan, South Korea
📌 35.032377, 126.238644
2026-01-21T23:29:14+00:00
13342
17958
16
Agana, Guam
📌 13.488833, 144.828233
2026-01-21T23:30:05+00:00
8927
11306
21928
5
Auckland, New Zealand
📌 -37.015757, 174.809637
2026-01-21T23:27:25+00:00
10084
13351
Source Data. Last update 2026-01-21T23:29:43+00:00.
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[SPDU] Squitter Count

"Squitters" are sent out every 32 seconds by Ground Stations and provide regular, progressive updates of the active frequency list you see here.
(last hour)
LOT-HFDL-PHNG 116
CS-KABQ-HFDL 96
KD-PANC-HFDL 25
F1-KHOU-HFDL 25
KC3ZYT-KIDI-HFDL 8
RH-KTKI-HFDL 5
CO-CYTZ2-HFDL 3
VA-HFDL-1 3
TL-KHIO1-HFDL 1
HFDL 0
RG_EGHQ_HFDL_4_11-15 0
AU-YBBN-HFDL 0
AL-LFBP-HFDL 0
MP-EDQM01-HFDL 0
RP-KLDJ-HFDL 0
RG_EGHQ_HFDL_2_5-6 0
BC-EINN4 0
RG_EGHQ_HFDL_1_8-10 0
RG_EGHQ_HFDL_3_17-21 0
DND-KHIO-HFDL888 0
PLIW 0
CN-ESUT-HFDL 0
squitter 0
JF-EGGD-HFDL 0
test 0
ASJ 0
PL-HFDL-EGFF 0
PLIW-HFDL-EGGD 0
k4jk 0
K4JK-KCHO-HFDL 0
RG_EGDI_HFDL_5-6 0
RG_EGDI_HFDL_11-15 0
RG_EGHQ_HFDL_8-10 0
RG_EGHQ_HFDL_17-21 0

[HFNPDU] Performance Data Count

Performance Report packets are sent by aircraft, and include frequencies that they have heard Ground Stations on recently. This data is used as a backstop in case station updates via squitters are unavailable.
(last hour)
CO-CYTZ2-HFDL 89
HFDL 60
MP-EDQM01-HFDL 56
TL-KHIO1-HFDL 42
F1-KHOU-HFDL 37
RP-KLDJ-HFDL 30
KC3ZYT-KIDI-HFDL 25
AU-YBBN-HFDL 22
VA-HFDL-1 8
AL-LFBP-HFDL 4
CS-KABQ-HFDL 4
KD-PANC-HFDL 2
RH-KTKI-HFDL 2
LOT-HFDL-PHNG 1
CN-ESUT-HFDL 1
RG_EGHQ_HFDL_1_8-10 0
RG_EGHQ_HFDL_4_11-15 0
BC-EINN4 0
DND-KHIO-HFDL888 0
RG_EGHQ_HFDL_3_17-21 0
RG_EGHQ_HFDL_2_5-6 0
PLIW 0
performance 0
JF-EGGD-HFDL 0
test 0
ASJ 0
MI-HFDL-1 0
PL-HFDL-EGFF 0
PLIW-HFDL-EGGD 0
k4jk 0
K4JK-KCHO-HFDL 0
RG_EGDI_HFDL_11-15 0
RG_EGHQ_HFDL_8-10 0
RG_EGDI_HFDL_5-6 0
RG_EGHQ_HFDL_17-21 0
Eurasburg 0