Hi Chris, Yes some serious mechanical engineering involved! My good friend Marshall designs vlf antennas for the military and has worked on NAA. In fact Marshall worked with Dr. Wundt, the fellow who
FYI, I purchased an Icom 7100 for the mobile and did the mod to open it up for wideband transmit. I discovered that it will transmit down to 100kHz. I have not put it on my spectrum analyzer yet so c
Hi Stan, I agree. The 7100 does have a TCXO, I'm guessing it would be ok for QRRS 3 or so. I did see a kit from a VK ham that allowed the use of a GPSDO with the FT-817, maybe something like that can
Not sure who said it but I recall someone on this reflector saying "If you haven't had a fire, you're not a real LF experimenter" http://www.arrl.org/news/antenna-fire-puts-saq-alexanderson-alternato
Hi John, I went to the M.I.T. library and made copies of Alexanderson's original papers and did some other research beyond that. The Alexanderson alternators were good up to about 20kHz, they achieve
Hello the list, Can anyone inform me about the bandwidth and any artifacts from the TDF time signal from Allouis? I understand that it is phase modulated +/- 1 radian so it should be quite narrow. Ho
Dennis, Thank you! Very good information! I am restricted to 130-190kHz, then nothing until 460kHz. I am hoping to find something in the 130-190kHz band outside of 135.7-137.8 Vy 73 Warren -- 73 Warr
There will be an experiment during the Aug 21 solar eclipse conducted using WWVB on 60 KHz and a U.S. Navy transmitter on 55.1 and 135.95kHz operating from California. This is a'crowd sourced' experi
Markus, Very sorry to hear of your loss. Some of my best friends were/are cats! I had a cat that sat on top of my tube (valve) transmitter (a Heathkit DX-100) to keep warm :-) Currently I have an old
Ken, It will RX on 475kHz but not TX. Your best bet is get a stable oscillator and mixer and put together a transverter. The Icom 7100 will transmit on 475 if it is opened up. 73 Warren K2ORS <div id
The High-Frequency Active Auroral Research Program (HAARP) in Gakona, Alaska plans WSPR tests on 3.592.6 MHz from 2300UTC - 0000 UTC using full carrier AM. Not exactly QRP though as ERP is 1.071
High-Frequency Active Auroral Research Program (HAARP) in Gakona, Alaska plans WSPR tests on 3.592.6 MHz from 2300UTC - 0000 UTC using full carrier AM. Not exactly QRP though as ERP is 1.071 GW !
Stefan, See John Andrew's web page : http://www.w1tag.com/RFA.htm 73 Warren On Mon, Oct 22, 2018 at 9:20 AM DK7FC <[email protected]> wrote: Hi all, Has someone ever build (homemade, not boug
