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Re: Topband: Fwd: Echo on 160m yesterday morning

To: "" <>, "" <>
Subject: Re: Topband: Fwd: Echo on 160m yesterday morning
From: Arthur Delibert <>
Date: Tue, 7 Feb 2017 03:13:57 +0000
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Thanks for these references on magnetospheric ducting.  Looks like as good an 
explanation as any I've seen (and better than most).

Art Delibert, KB3FJO

From: Topband <> on behalf of Andy Cook 
Sent: Monday, February 6, 2017 7:20 AM
Subject: Topband: Fwd: Echo on 160m yesterday morning

I think you'll find this was Magnetospheric Ducting. Take a look at some of the 
articles here 
and here
LA3ZA Radio & 
Radio amateur, ham radio blog

ad hi -<>
There are some instrumentation prob- lems when using ham transceivers as 
"radar" sets. Transmitlreceive switching may not be fast enough, and our newer 

Delay depends on your latitude - but couple of hundred millseconds is about 
right and this is a peak time of year for the effect.
I've heard this quite frequently on 80m around mid local-evening during the 
winter, and one occasion - on 3rd Feb last year - very strongly indeed. That 
night I was able to hear my echoes with just 25mW into a dipole on 80m - but 
it's often strong enough to be audible with a few watts. I've read papers which 
suggested it does also occur on 160m.
Reports of these being less strong / gone when you switch to a vertical look 
plausible as well since they apear to require vertical incidence from the 
Andy, G4PIQ
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