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
Building an HF amplifier

Started by Matt285

6 Replies
5758 Views
Last post April 17, 2021, 2022 UTC
by redhat
9 Replies
5747 Views
Last post July 29, 2023, 2016 UTC
by Quinta
14 Replies
5656 Views
Last post October 05, 2023, 0155 UTC
by ~SIGINT~
14 Replies
5632 Views
Last post July 08, 2022, 0541 UTC
by Pigmeat
8 Replies
5593 Views
Last post December 02, 2019, 0149 UTC
by WWBR
Passive Squelch Circuit

Started by RadRoadrunner

5 Replies
5589 Views
Last post March 12, 2019, 0707 UTC
by Stretchyman
18 Replies
5536 Views
Last post February 09, 2022, 1645 UTC
by Teotwaki
14 Replies
5500 Views
Last post February 12, 2018, 0710 UTC
by Stretchyman
10 Replies
5447 Views
Last post January 17, 2018, 1652 UTC
by Josh
5 Replies
5438 Views
Last post June 05, 2020, 1343 UTC
by syfr
12 Replies
5253 Views
Last post February 06, 2022, 1542 UTC
by Teotwaki
4 Replies
5212 Views
Last post July 02, 2015, 1546 UTC
by uhf35
0 Replies
5198 Views
Last post January 16, 2025, 1631 UTC
by ThaDood
4 Replies
5150 Views
Last post November 08, 2018, 0634 UTC
by bumbelstock
5 Replies
5146 Views
Last post February 16, 2024, 1906 UTC
by Brian
8 Replies
5136 Views
Last post March 15, 2021, 2108 UTC
by Charlie_Dont_Surf
5 Replies
5082 Views
Last post May 04, 2014, 0411 UTC
by Fansome
4 Replies
5064 Views
Last post July 04, 2024, 2354 UTC
by Charlie_Dont_Surf
7 Replies
4968 Views
Last post November 09, 2015, 1422 UTC
by Stretchyman
8 Replies
4965 Views
Last post October 05, 2023, 0130 UTC
by Charlie_Dont_Surf

 

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

Locked Topic
Sticky Topic
Poll


HFUnderground Mug
HFUnderground Mug
by MitchellTimeDesigns