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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
If anyone happens to be transmitting can they please share the frequency they are likely to be on, I'm going to set up a datalogger on my SDR here.
The aim being to see if an hour either side there is a change in signal which is actually being measured. See
Due to the sharp edges at totality its likely that propagation might be really anomalous as a CME is also inbound. Having one hit *during* totality would be a tremendous stroke of luck and valuable scientific data could be obtained on the nature of ionospheric propagation in lots of different locations.
If someone can try and send out "802701" in Morse I am more likely to decode that with my limited equipment here. Frequency is pretty much spot on now so can use a very narrow band to reduce noise, probably around the low (60-180kHz) band as antenna is relatively easy to build with recycled wire and DIY ferrite/pyrolytic hybrid. I'd probably need to make some sort of heterodyne circuit likely using a tunnel diode or lambda diode for maximum gain, so SDR can receive such a low frequency signal. EDIT: Extended to 13MHz with Thanks, -Andre
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
If anyone is in the low amateur band (20m) my antenna is hooked up and working.
EDIT: Got some data on 14 MHz which I'll share as soon as its been extracted from my phone. It appears that there was a small drop in noise coincident with the eclipse but due to a SNAFU involving a wiring issue I am not 100% sure how much was just random RF. Made every effort to reduce this by turning off interfering appliances and LED lighting.
Future projects, see also I had some ideas to use a lambda diode as these aren't particularly expensive to make and it would be an excellent RADCOM or EPE circuit idea. Since my original article in 2009 I've since enhanced the system to use optical means of varying transconductance with a PNP based optocoupler.
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"Alien" radio signals during eclipse 2017?
