[TangerineSDR] [HamSCI] Fwd: Demo of Live VLF System

[Jonathan]

Thanks Khan and Greg!

For those who did not get a chance to see the presentation, here is the
YouTube link:

https://youtu.be/GAmbDQd8kR0?t=977

In the beginning of the presentation, I mentioned that the PPS pulse was
getting clipped because it was over the dynamic range of the sound card. I
used the potentiometer that came with the Audio Injector Stereo as a
voltage divider to reduce the level of the PPS pulse so it doesn’t clip. As
a result, I don’t get any timing errors anymore! Attached is the trace of
the PPS pulse.

Since the potentiometer is double ganged for stereo, I shorted the wiper
and output as well as desoldereding the ground connection, so the signal
from the VLF receiver would bypass it completely and wouldn’t be attenuated.

John,

With a system like this and vlfrx-tools, NAA and others can be monitored
for GRBs and geomagnetic activity too. Thanks for posting the link!

Jonathan
KC3EEY



On 9/2/21, 'John Magliacane' via HamSCI <hamsci at googlegroups.com> wrote:

>  Moore Observatory located at the University of Louisville (Kentucky) has
a

> simple VLF receiver tuned to NAA at 24 kHz that has been used to record
and

> plot NAA signal strength for over 20 years. This is being done as part of

> their research into Gamma Ray Bursts and Solar Flares.

>

> Details of their operation can be found here:

>

>  http://moondog.astro.louisville.edu/

>

> Just thought I'd mention it for anyone interested in this sort of thing...

>

>

> 73 de John, KD2BD

>

>

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>
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