We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Subject / Started by Last post
61 Replies
13217 Views
Last post December 31, 2024, 1849 UTC
by kris
5800 Khz numbers

Started by beaconman « 1 2 »

15 Replies
13094 Views
Last post February 25, 2011, 1726 UTC
by Token
60 Replies
12930 Views
Last post October 31, 2024, 2239 UTC
by kris
54 Replies
12256 Views
Last post October 30, 2023, 0958 UTC
by kris
58 Replies
12204 Views
Last post December 31, 2023, 2126 UTC
by kris
31 Replies
12106 Views
Last post November 28, 2020, 0925 UTC
by Looking-Glass
S25? 13883

Started by kalvados « 1 2 »

19 Replies
11619 Views
Last post February 06, 2018, 1630 UTC
by kalvados
61 Replies
11340 Views
Last post February 29, 2024, 1833 UTC
by kris
30 Replies
11124 Views
Last post September 17, 2023, 1759 UTC
by kris
1 Replies
11034 Views
Last post August 31, 2019, 1205 UTC
by Ary-B
5 Replies
10945 Views
Last post June 06, 2013, 1053 UTC
by Dash Bronzehand
S11a schedule Mar - Apr 2024

Started by kris « 1 2 3 4 »

55 Replies
10932 Views
Last post June 23, 2024, 2321 UTC
by kris
5 Replies
10536 Views
Last post September 09, 2019, 1339 UTC
by Looking-Glass
0 Replies
10516 Views
Last post January 07, 2010, 0254 UTC
by The Web
7 Replies
10495 Views
Last post April 01, 2015, 2200 UTC
by daveontheradio
12 Replies
10326 Views
Last post April 03, 2010, 2232 UTC
by 4405486
15 Replies
10192 Views
Last post March 29, 2025, 2207 UTC
by kris
0 Replies
10112 Views
Last post May 11, 2017, 1858 UTC
by Strange Beacons
15 Replies
9660 Views
Last post June 28, 2025, 2307 UTC
by kris
14 Replies
9618 Views
Last post June 27, 2011, 1801 UTC
by 4405486

 

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns