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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Paul Nicholson <[email protected]>
Date: Mon, 16 May 2016 05:38:46 +0000
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Stefan wrote:

> would you think that going from 100s to 200s will improve
> things by about 3 dB?

Yes, or better: keeping to 100s and going to a 16K mode instead
of 8K for an increase of coding gain.

> How long do you record the VLF soundcard stream?

About 65 months at the moment.

> Would it be possible, for example, to transmit a 1 week long
> message, without an announcement before the start?

Yes, in principle.  The longer the message the more chance of
a battery problem or sheep knocking down one of the antennas,
or thunderstorm or power cut, or one of the cats sleeping on
top of the GPS antenna.

But with a long message, an interruption of a few hours is
not a disaster.  After a power cut, my rx will restart with
the same reference phase and continue recording so there will
be a gap but no loss of phase.

We may have to put this to use when we reach ULF.

Un-announced is ok because of the continuous recording but better
to announce if possible so that I know not to do maintenance
(or tests with kites! Will be playing with the Power Sled 24).

Paul Nicholson

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