[Lowfer] Wideband signal on 135.95 kHz

[Garry Hess]

Thanks for the confirmation John. I see it via both my eprobes and a 
loop so I was certain it wasn't locally generated. Bandwidth is about 
+/- 100 Hz and it looks like a 200 baud DGPS signal but of course 
doesn't decode. It may be some encrypted modulation like used by the 
Navy for NAA, etc. below 30 kHz. I didn't know NPG was on any other 
frequency than 55.5 kHz. I logged it there in 2011 and found it back on 
testing a carrier May 22, 2015. A Google search shows that very long ago 
NPG indeed transmitted on 135.95 kHz 
(http://lists.amrad.org/pipermail/tacos/1998/000479.html). The other 2 
stations mentioned in that URL aren't consistent with the headings we're 
seeing for it. It really doesn't bother WSPR reception around 137.5 kHz 
(but tonight's storms certainly do here!).
-- 
73, Garry, K3SIW, EN52ta, Elgin, IL