The OmniPAL VLF receiver on Crete



The OmniPAL (Phase and Amplitude Logger) narrowband receiver was developed at the University of Otago, in New Zealand and provided to us by the Hungarian VLF group at the Eötvös Loránd University of Sciences in Budapest. It was istalled on 15 July 2005, but wasn't fully operational until 26 August 2005 due to problems with the SNR.

The receiver uses an electric field antenna and it is capable of recording the amplitude
and phase time series of six VLF transmitters with 50 ms resolution.
The currently monitored transmitters are:

18.3 kHz – HWV, Le Blanc, France
20.9 kHz – HWV, Rosnay, France
24.0 kHz – NAA, Cutler, Main, USA
37.5 kHz – NRK, Keflavic, Iceland
40.75 kHz – NAU, Aguada, Puerto Rico
45.9 kHz – NSY, Niscemi, Sicily, Italy

The receiver is operating continuously both during day- and night-time.


Antenna
The electric field
antenna.


Preamp
Preamplifier.


Omnipal_PC
The longest card is the
OmniPAL DSP card.


[The Stanford VLF receiver]

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