Re: [IRCA] Another WWXL 1450 DX test

[Barry McLarnon <bm@xxxxxxxxxxxxxxxx>]

On 03/16/2014 02:50 PM, Walter Salmaniw wrote:
> It's easy to hear sweeps.  I often wonder whether they are ionosones.  We
> sure see them frequently on the Perseus waterfall on SW.

An interesting thought, Walt.  I believe swept-frequency ionosondes (aka 
chirpsounders) typically don't go below 2 MHz, but no doubt there are 
exceptions.  If you did hear one zip through an AM broadcast channel 
(and I think I've heard a few myself), it would be a single, isolated 
sweep, and it wouldn't be repeated for at least 15 minutes or so.  In 
contrast, if sweeps are used as part of a DX test, they should be 
repeated quite rapidly, and the difference should be quite obvious to 
the ear.

Barry

--
Barry McLarnon  Ottawa, ON

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