VLF Receivers

INSPIRE VLF-2

The VLF-2 walking stick configuration. It is mounted in a closed cell foam padded box made from old erector set parts. We've found this mount to be effective in preventing damage during transportation.

INSPIRE RS-4

The RS-4 walking stick configuration. The mount is made of foam and erector set parts. This is Team 19's first VLF reciever.

Princeton Applied Research Receiver

This golden find belongs to Ron Hunt. It was designed for research, testing and development of circuits in the field or the workbench. It has an internal battery system (four 9 volt batteries currently) with a built-in charging system. It has a calibrated gain control, it also has very useful low-pass and high-pass adjustable filters.

The Larrycrafters VLF 101-A (homemade)

This reciever was built with Radio Shack parts, the electronic design follows the INSPIRE RS-4 schematics. The binding post / banana jacks work really nice for making antenna and ground connections, they are also easy to work with in the dark. It is powered by a single nine volt battery.

The Ulti-Receiver (homemade)

This receiver was also built with Radio Shack parts, the electronic design is a little different from the
INSPIRE RS-4.The purpose of this unit is mainly to hear VLF without the hassle of hooking up a
bunch of wires, grounds, speaker amplifier, (to record from it, it must be grounded). It has separate
level controls for recording and monitor speaker output, also bass and treble controls. It uses binding
post / banana jacks for antenna and ground connections.

 WWV Receiver

This receiver is used to put UTC time marks onto recording media for VLF data time coordination. Specific Products model WVTR standard frequency receiver, it has a built-in speaker, battery power test button, runs on ac or dc, Crystal controlled for stability, BNC connections for the antenna and audio output. It receives at 2.5, 5, 10, 15, 20, and 25 Mhz.