[Lowfer] Luxembourg Effect

[John Rabson]

> Date: Mon, 13 Feb 2012 06:04:53 -0600
> From: Garry Hess <k3siw at sbcglobal.net>
> Subject: Re: [Lowfer] VLF TONIGHT
> To: lowfer list <lowfer at mailman.qth.net>
> Message-ID: <4F38FC65.8060802 at sbcglobal.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Yes, the Luxembourg Effect is for real (for example, see 
> http://www.haarp.alaska.edu/haarp/factSheet.html), but that isn't why 
> Rick is seeing IM products. If it were the case then everyone would see 
> those products and we don't.

Not necessarily.  Quite often, when the Luxembourg effect is observed on 137 kHz in Western Europe, some people hear it and some don't.  You have to be in the right geographical relationship with the two transmitters and the point above which the ionospheric intermodulation is taking place. 

I know that G3NYK subscribes to this list, and he may well be able to provide a better explanation.

> Most likely Rick's receive setup is 
> overloading and that non-linearity is the cause.

It should be easy to check for this by inserting an attenuator between the antenna and the receiver. If the suspect signal is attenuated much more rapidly than the wanted one(s), it would tend to confirm that it is an overload problem.

John F5VLF