If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
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: 4062
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.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
"Alien" radio signals during eclipse 2017?
