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LF: Re: vlf test

To: <[email protected]>
Subject: LF: Re: vlf test
From: "James Moritz" <[email protected]>
Date: Mon, 7 Feb 2011 18:05:01 -0000
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Dear Ossy, LF Group,

I switched the VLF RX on at about 1130utc, and returned home to find the display shown in the attachment at about 1740utc. Your signal level seems to have varied considerably here at IO91vr during the day, with a best SNR of about 20dB in 1.5mHz FFT resolution during the early afternoon. The dotted lines are 1 hour markers. The vertical bright streaks are rapidly drifting mains harmonics, which were very noisy here again today. The equipment was as normal here, 0.8m square loop oriented E-W,with preamp feeding the lap-top audio input.

Cheers, Jim Moritz
73 de M0BMU

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