I think I'm hearing two groups of four bursts, with the first burst from the 
second transmitter coinciding with the last burst from the first transmitter.  
Anyone agree?
Jeff W6JK 

    On Thursday, February 22, 2018 10:51 AM, Tim Shoppa <tsho...@gmail.com> 
wrote:
 

 Here is a recording (made on 80M a few years ago but sounds substantially
the same on 160M) of what I'm told is the Wallops Island Ionosonde:

http://n3qe.org/wumwum_80M.wav

Here is the waveform showing 4 louder cycles followed by three softer
cycles:

http://n3qe.org/wumwum.png

If you look at the second panel of the waveform, you see a 20Hz
substructure in the pulses.

Even though I'm sitting in once place with a 2.4kHz filter making this
recording, I understand that the actual spectrum occupied is wider and it
cycles through the bands repeating on a several minute cycle.

Tim N3QE



On Thu, Feb 22, 2018 at 12:56 PM, Jim - WS6X <ws6x....@gmail.com> wrote:

> I too, am curious as to the source. I heard it for many years in Central
> California; hear it at my current QTH in Central Shenandoah Valley; and
> heard it last weekend at NR4M.
> I describe it as a scratchy sound, sometimes with a bit of tonality.
> Always 4 pulses (although I don't think I've ever heard the 4 followed by 3
> as Bill describes.). I've never timed the interval between the groups of 4,
> but it is fairly infrequent. I'll hear it throughout the evening when I'm
> at the radio for long periods. It is loud enough on 160 here in VA that it
> will wipe out all but the strongest signals. I will have to pay more
> attention to details and record when I hear it.
> I wish I was better at phonics, but what I hear has distinct articulation:
> "Gugghk  gugghk gugghk gugghk". 😊
> Jim, WS6X
>
> 1. Speaking of noises... (Bill Tippett)
> Message: 1
> Date: Wed, 21 Feb 2018 12:48:20 -0500
> From: Bill Tippett <btipp...@alum.mit.edu>
> To: topband <topband@contesting.com>
> Subject: Topband: Speaking of noises...
>
> Does anyone know the source of periodic wideband buzzes that sound like
> this:
>
> buzzz..buzzz..buzzz..buzzz (i.e. 4X then pause)  buz..buz..buz (3X ~10 dB
> down).
>
> I believe this may be some sort of ionospheric sounder but I've heard this
> for decades, including when I was in Colorado.  Hopefully someone knows
> what's generating this.
>
> 73,  Bill  W4ZV
>
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