Hello VLF, Today (February 02, 09:30 UTC) I started an unmodulated carrier on 5170.03 Hz. I want to leave the transmitter on for at least 24 hours. Who cares to receive the carrier, how far could the

I used decades ago a 3 ft per side loop antenna wound with #30 magnet wire about 300 turns. With a simple homemade audio amp it provided much entertainment for listening to tweaks and whistlers. Back

Hello folks, this time I used a variable capacitor and two different ferrite antennas. One has 20mH and the other one 246mH. Due to the fact that my VLF-RX has a very high input impedance the parallel

Hi All, Today I'm running a test with a much longer earth loop now the sheep have left the field here. Effective length between earth stakes is 280m, bearing 137deg from IO94IL, so SE/NW beam. The wir

There's a VERY weak peak on both Warsaw and Heidelberg at the correct frequency on Paul's page so maybe i made it! I'll run another carrier test tomorrow on the same freq but earlier start, hopefully

I have an interesting issue here with my Creative labs external USB sound blaster SB 1095 -becoming occasionally deaf, especially from 2Hz>10kHz using my ELF/VLF DK7FC preamp and 10m sided T antennae

Hello VLF, Tonight (01/13/2023) from 00:00 UTC I will send EbNaut 8K19A // crc16 // 30s // 5 chars on the frequency 8270.03 Hz. (Duration: 15360 seconds, 04:16:00.00) Please do not post positive decod

I am transmitting a GPS-Locked carrier on 8270.008Hz with 30W of power into the antenna since 6th January 15:00UTC Is anyone able to detect it? I cannot see it on any grabber. Maybe the low noise sect

I had very good luck with a TS472. coil on ferrite bar -> TS472 (jumper for max gain)-> stereo USB sound adapter -> MacBook computer running Audacity Detects transmitter signal at about 17 KHz from my

There are very cheap ECG modules with the AD8232 on eBay, Amazon ... That's a very specialized ECG sensor. Would it be possible to use it as ELF receiver with capacitive antennas (2 metal plates or so

Good morning to everyone, I was rebuilding the easyloop circuit for my loop antenna. I'd like to add a dual power supply cause of my op-amps "LME49990 and AD797". Unfortunately here where I live (Icel

My SID detector did its thing today and I got a good pix of the event which occurred around 18:47 UTC. There’s still time for a second one, if the sunspot feels up to the task! 73, Bruce, VE3EAR

Hi all, found HWU Rosnay is off on 18.3 tonight. At its place (18.2) a faint signal on the waterfall: Indian Navy VTX Vijayanarayanam? 73 Ciccio Italy RX: Airspy HF+Discovery ANT: PA0RDT Original Mini

Hello VLF, The currently low-interference time should be used to send a signal to more distant VLF-RX stations To be able to offer. I will therefore try to transmit on 8k27 Hz in the next few days, if

Hi VLF Tomorrow, January 4th and the day after 5th, i will transmit an EbNaut message with following characteristics: Frequency: 8270,0075 Hz Code: 8K19A CRC: 16 Symbol period: 30 nº Characters: 3 Dur

Apparently DL0HOT has recently transmitted a long carrier on 170.005 Hz, and I looked at DL0AO E-field data to see whether we might have picked up anything. In a plot using 12 hour sliding averaging,

A happy, healthy and peaceful new year to the whole VLF group wishes you Bernd, DL3JMM. Continued successes and great activity on the very low frequencies! See you again on various grabbers and decodi

I am designing a small active receive loop for "VLF" use. Before I start building I thought it would be fun to do some modeling, changing a few variables here & there to see what effect they would hav

Hi All, This morning I've been running a test with around 80w carrier on 8270.01174 - this is generated using an AD9851 DDS with 10MHz ref. The 'Antenna' is 40m spaced earth electrodes running N/S, it

About 40 minutes ago, at around 22:05 UTC, Wed 12-28-2022 here in Indiana I got lucky and had my receiver tuned to 17.8 kHz when some TACAMO FSK traffic was being sent. This was close to sunset. To he