[Lowfer] It is...

[Dexter McIntyre, W4DEX]

Thanks Kurt.  I've heard many a strange signals on HF over the years but
this is my first sonar transponder.  Now you've got me wondering how a
signal modulated like this measures something.

Dexter

"Mr. K. Rudolph, KD7JYK" wrote:
> 
> It is a sonar transponder, it is measuring variations on the ocean surface.
> These devices have been around since the late 60's.  They can be heard on
> three of four frequencies on HF.
> 
> Kurt
> 
> ---
> Ross Technologies Signals Intelligence Division
> Rosetta Proving Grounds