K1EL
VLF-B User Manual
VLF - B
Introduction
The VLF B VLF converter allows you to listen to the band of frequencies below the standard AM
broadcast band between 10 and 500 Khz. Among the many interesting signals in this VLF range
are long range navigation signals, radioteletype, European broadcasts, and radio beacons. The
VLF-B will convert the range of 10 – 500 KHz to 4010 – 4500 MHz which is just above the
amateur 80 meter band.
Most VLF signals are ground waves and frequently travel over great distances. But you do not
have to cut a long wire antenna to a specific length to receive them, Any length wire vertical or
horizontal will usually provide reasonably good reception but make it as long as you can. A tuned
electromagnetic loop is another option for VLF use. These are usually quite expensive to
purchase but it is not too difficult to build your own. A loop has two big advantages over a long
wire; noise canceling and ability to rotate it for directional reception.
Wikipedia has a very good article on VLF communications along with typical signals that can be
found on this challenging band.
VLF-B User Manual
11/30/2023 Rev 1.0
Page 2
