brainwagon

Well, as I was heading off to bed, I was reminded that there is currently a DXpedition operating from Midway island using the callsign K4M. A quick google revealed that they were operating on 7.078 SSB, so before heading off to bed, I decided to power on my HW-8 (ever since I got it, the FT-817 has been side lined) and see if I could hear anything. And, voila, here is K4M responding to G0HNW (in England). I just grabbed a small snippet of audio, but it gives you some ideas as to what you can hear with a radio like the HW-8.

K4M answering G0HNW on 7.078 SSB, October 15, 2009 07:05 UTC

Addendum:

Same recording, but with noise reduction courtesy of Audacity

Addendum²: I was wondering what algorithm Audacity actually implemented for noise gating. It’s spectral noise gating. I had previously blogged that papers by James Moorer provided some details of similar algorithms, but it appears that my previous links to him had decayed, so there is a fresher one.