[UK-CONTEST] OT-Band hoppers

[Dez Watson]

Clive,

I think you're right and were hearing (seeing) an ionospheric sounder.

They are even more prominent once you get into the higher HF bands as 
they suddenly vanish when they reach the critical frequency.

73

Dez



Clive Whelan wrote:
> Hardly contest related so please excuse the bandwidth, but you are such 
> a knowledgeable lot here ;-)
>
> I don't know how better to describe that which I'm referring to. If you 
> have a high boredom threshold read on...
>
> There are many interesting things about using an SDR, and many are 
> related to the visual aspects thereof. A particular fascination for me 
> is observing signals passing through our bands- most notably 7Mhz- which 
> are quite inaudible despite being what would probably be S7(ish). 
> Probably they are not audible even as a blip, because of the speed of 
> transit. I haven't measured it, but probably they traverse the span of 
> 7Mhz in a second or two.
>
> My best guess is that these are ionosondes of some kind. Anyone know?
>
> 73
>
>
> Clive
> GW3NJW
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