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Re: [TenTec] 40M Band Sweeps

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] 40M Band Sweeps
From: Kevin Purcell <kevinpurcell@pobox.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 7 Dec 2007 13:40:44 -0800
List-post: <mailto:tentec@contesting.com>
ALE doesn't sweep it sends on particular (selected channels) for a  
given net in selected from a predetermined list and in conjunction  
with predictions from a propagation program.

You can hear typical ALE here (I think there is more than one type).  
Sounds like an alien ray gun!


from this collection


On Dec 6, 2007, at 5:13 PM, Stuart Rohre wrote:

> I wonder if sweeps are also used by Automatic Link Establishment  
> radios?
> There is some work going on with them near the ham bands,  
> especially Air
> Force MARS.   (Army MARS has just discontinued their ALE program).

Paul, W9AC said:

> Perhaps my location is unusually sensitive to the sweeps,

I suspect it must be ground wave range for you. There's no NVIS on  
40. Or perhaps you are just right for skip from the source right now.

> but I am a bit
> astonished that this deliberate interference is allowed to persist  
> around
> the clock, albeit in short bursts.  No station identification seems  
> to be
> required either.   Pretty amazing, but government organizations and  
> the
> military seems to qualify for special exemptions from "good operating
> practices."

How would you ID a sweep? Really fast CW :-)

For sounders that's just the way it is.
Kevin Purcell

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