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
3 Replies
2298 Views
Last post August 28, 2019, 2103 UTC
by ChrisSmolinski
5 Replies
2297 Views
Last post January 31, 2022, 0347 UTC
by RobRich
2 Replies
2290 Views
Last post July 25, 2021, 1830 UTC
by ThaDood
2 Replies
2289 Views
Last post March 29, 2018, 2013 UTC
by RobRich
4 Replies
2285 Views
Last post April 07, 2021, 0208 UTC
by CoolAM Radio
2 Replies
2284 Views
Last post October 29, 2015, 2129 UTC
by John Poet
4 Replies
2284 Views
Last post June 13, 2020, 2003 UTC
by chanito
6 Replies
2282 Views
Last post April 28, 2020, 1756 UTC
by ThaDood
4 Replies
2282 Views
Last post December 09, 2018, 0920 UTC
by Looking-Glass
5 Replies
2278 Views
Last post February 14, 2022, 0151 UTC
by MegatonRange
3 Replies
2277 Views
Last post July 09, 2018, 2106 UTC
by pinto vortando
5 Replies
2266 Views
Last post April 24, 2025, 0241 UTC
by Charlie_Dont_Surf
3 Replies
2263 Views
Last post August 26, 2019, 1643 UTC
by SorensenDK
2 Replies
2253 Views
Last post November 01, 2023, 0846 UTC
by TRI International
6 Replies
2248 Views
Last post June 03, 2020, 1411 UTC
by fox558
4 Replies
2243 Views
Last post May 02, 2021, 2041 UTC
by Jason
Common mode noise

Started by NJQA

3 Replies
2240 Views
Last post April 01, 2022, 1929 UTC
by Ed H
3 Replies
2237 Views
Last post December 21, 2023, 2039 UTC
by Ed H
2 Replies
2223 Views
Last post December 02, 2021, 2119 UTC
by Charlie_Dont_Surf
3 Replies
2216 Views
Last post March 31, 2019, 1214 UTC
by CoolAM Radio

 

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

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns