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Re: LF: Testing Audioinjector Octo with RPi3

from [Stan, W1LE] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Testing Audioinjector Octo with RPi3
From: "Stan, W1LE" <[email protected]>
Date: Sun, 25 Feb 2018 07:49:19 -0500
In-reply-to: <[email protected]>
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Hello Paul,
 Can multiple 2 channel audioInjectors be stacked up on the Raspberry Pi, to get 4 channels ?
Can a single 2 channel audioinjector be used with a USB 2 channel audio card, for 4 channels ? 

How about 2 separate USB audio cards for 4 channels of input ?
How are the 3 needed channels used ?  GPS/PPS, E filed antenna, and H field antenna ? 

Slowly getting started...

Stan, W1LE    Cape Cod   FN41sr


On 2/25/2018 1:32 AM, Paul Nicholson wrote:


A four day run of the Octo sampling at 48k/sec with PPS from
a neo-m8t.   The PPS jitter is around 30nS most of the time,

 http://abelian.org/vlf/tmp/180225a.png

The Octo sample rate is also staying quite constant too.
The GPS has a poor view of the sky.

The Octo is working well at 48k/sec.

No feedback from the Flatmax Octo forum on the glitches at
96k/sec.  Even if I keep the input level below 1.3V it looks
like the S/N is poor.   As it stands, it's not really usable
at that rate.  My LF rx project is stalled without a 3-channel
96k/sec capture.

Later today I'll put the Octo back to 96k/sec for another play.

--
Paul Nicholson
--
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