Re: [VLF_Group] Question - Receiving VLF Signals
- Hi Shawn,
The link you sent to Mark..( Hi Mark ) is an old one, the site now has its
own domain and is http://www.da4e.nl/index.html
This is as permanent as it gets, and the link for Mark would be
for the schema of the BBB-4.
There is no doubt that Steven McGreevy's BBB-4 is still one of the best Rx's
around for Natural Radio. Also details for the mods required to use BNC
plugs for the whips are on the same site.
As you mentioned, the listening/recording should be as far away as possible
from mains sources ( 50-60 Hz line frequencies), and earthing is a must..
My intro to natural radio was an old Bush radio, standing 3 feet high, (
furniture in the 40's-50's ) on Long wave it was sometimes outstanding for
Hope you get plenty of fun out of this interest Mark, I'm sure you will once
you get into it.
All best wishes to all in the group for 2002
----- Original Message -----
From: "Shawn E. Korgan" <VLFkorgan@...>
Sent: Tuesday, January 01, 2002 3:50 AM
Subject: Re: [VLF_Group] Question - Receiving VLF Signals
> Hi Mark,
> Great to have you aboard! Most of us choose to use a very sensitive
> audio amplifier (with some filtering of the freq's below say 300 Hz and
> above 10,000 Hz) to hear naturally occurring VLF signals. There are many
> different types of designs and discussion on which type of receiver is
> the best. I started listening to naturally occurring VLF radio signals
> by hooking a long wire (several hundred feet) to several different types
> of battery operated audio amplifiers I had around the house. Believe it
> or not, I was even using car stereo amplifiers at one point as my first
> VLF receivers! The more sensitive the audio amplifier the "deeper" a
> person is capable of hearing into the VLF band (generally 0.1-20 kHz is
> of interest). One thing which is a must for VLF listening is to try and
> locate as far as possible away from power lines otherwise nothing but
> loud hum from power lines is heard.
> If you're up to building a receiver you may give these links a try:
> http://members.xoom.com/Aggie97/ham/VLF.gif or
> http://www.rcg.nl/~dave/BBB_41.html. It will be worth your effort. My
> SK-1 receiver is based off of the above design by Stephen McGreevy and it
> works terrific! With spring just around the corner, I'm already buckling
> up and getting ready for the increased VLF activity that March and April
> can bring. "In general, the highest whistler activity for either
> hemisphere occurs during the winter and spring of the year for that
> hemisphere." Whistlers and Related Ionospheric Phenomena, p. 148.
> I use an 8' whip antenna while others choose to use large loops of
> wire as antennas. Loops are a little more hassle to handle (to put up
> and take down) but will allow greater rejection of power line
> interference. They also will often work well even in a forest whereas a
> whip antenna will not. A whip antenna on the other hand can easily be
> mounted permanently on a vehicle without the hassle of having to take it
> up or take it down like with a loop. Whip antennas work great when they
> are away from other objects such as trees, buildings, and other tall
> objects (which absorb VLF signals). Listening atop a tall hill or
> mountaintop will make the reception even better! Both antennas work
> great and sound nearly identical in stereo sound comparisons I have
> I have never purchased a VLF receiver and for this reason do not
> have any recommendations other than the links above. Steve McGreevy
> sells several different VLF receivers if you would be interested in the
> purchase of a pre-built unit.
> I live about 40 miles from WWVB! They have a nice strong signal
> since they boosted their power to 50 kW. Speaking of static, I really
> should be doing more VLF listening before summer hits again. Nighttime
> hours are the best for monitoring earth's natural signals with the hours
> preceding sunrise often being the best hours of the entire night.
> [Non-text portions of this message have been removed]
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