22-03-2017, 07:49 AM
The last couple of days on 40m there is a widespread digital signal over the band, with spots every 15kHz.
Initially just listening on a single frequency I thought it was someone running FreeDV or similar, but then after looking at the spectrum scope I noticed it extended over the range of 6-8MHz then fell away, but that would be due to my doublet when tuned for 40m.
It went for some hours yesterday, I didn't check late in the day or overnight and its there again now. It's about strength S9+10 so not here but relatively local, and I suspect it may be a portable traffic lights setup, or more likely an electronic sign or something similar, because it has a 10 second cycle of on/off. There are roadworks a couple of blocks away so I will go out and check later today. It certainly renders the band useless.
Anyone heard similar?
I can't seem to attach an audio file here so this link to another site will hopefully work:
http://www.aurfscan.com.au/attachment.ph...1490083807
Initially just listening on a single frequency I thought it was someone running FreeDV or similar, but then after looking at the spectrum scope I noticed it extended over the range of 6-8MHz then fell away, but that would be due to my doublet when tuned for 40m.
It went for some hours yesterday, I didn't check late in the day or overnight and its there again now. It's about strength S9+10 so not here but relatively local, and I suspect it may be a portable traffic lights setup, or more likely an electronic sign or something similar, because it has a 10 second cycle of on/off. There are roadworks a couple of blocks away so I will go out and check later today. It certainly renders the band useless.
Anyone heard similar?
I can't seem to attach an audio file here so this link to another site will hopefully work:
http://www.aurfscan.com.au/attachment.ph...1490083807
Damien
http://www.vk3rx.com
http://www.vk3rx.com