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
104 Replies
42592 Views
Last post August 31, 2025, 2152 UTC
by kris
56 Replies
7950 Views
Last post August 30, 2023, 1933 UTC
by kris
47 Replies
8677 Views
Last post December 30, 2024, 2332 UTC
by kris
40 Replies
9065 Views
Last post December 31, 2023, 2139 UTC
by kris
52 Replies
9998 Views
Last post November 02, 2024, 2314 UTC
by kris
17 Replies
1059 Views
Last post September 23, 2025, 2322 UTC
by kris
31 Replies
7971 Views
Last post October 30, 2023, 1001 UTC
by kris
2 Replies
1327 Views
Last post March 08, 2018, 1801 UTC
by kris
0 Replies
1184 Views
Last post March 17, 2018, 0005 UTC
by kris
2 Replies
1431 Views
Last post March 08, 2018, 1807 UTC
by kris
0 Replies
1084 Views
Last post November 28, 2015, 0401 UTC
by vhavrilko
S11a, M12, M14

Started by Ary-B

1 Replies
2080 Views
Last post September 20, 2019, 0057 UTC
by sat_dxer
S25? 13883

Started by kalvados « 1 2 »

19 Replies
11741 Views
Last post February 06, 2018, 1630 UTC
by kalvados
S28

Started by Ary-B

1 Replies
1858 Views
Last post February 27, 2013, 2206 UTC
by Ary-B
0 Replies
5798 Views
Last post January 26, 2013, 0652 UTC
by Ary-B
2 Replies
3029 Views
Last post February 02, 2013, 1554 UTC
by Echo_One
0 Replies
933 Views
Last post March 28, 2016, 0330 UTC
by vhavrilko
0 Replies
952 Views
Last post March 28, 2016, 0323 UTC
by vhavrilko
2 Replies
2374 Views
Last post April 20, 2021, 2156 UTC
by kalvados
0 Replies
2231 Views
Last post December 20, 2012, 1638 UTC
by Echo_One

 

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