Return to KLUBNL.PL main page

[Top] [All Lists]

Re: VLF: E-field receivers in Todmorden

To: [email protected]
Subject: Re: VLF: E-field receivers in Todmorden
From: Paul Nicholson <[email protected]>
Date: Sat, 2 Sep 2017 06:43:28 +0000
Dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=bzHVS08fUJ1y1GycjOh3aQ5tTKhc0CsPOFnIfwgngZA=; b=QKLxzNwIwV9pMacTUxvHlGcYW6 gs5gkuEdEgJUKKcNxbhiJvDgiCFBQ5qUO+2TpaN74FiDyzMRVIrYmQo45IU6Vc4Y2csjdVY6pqLLl b1KI9VFLGj9iAEwVOeymf1UeyeT1va4OZRmlZa1KRRVT3OEq5/Rw/2+LSIkjNJE6ZNCA=;
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
Markus wrote:

> maybe in the received signal level from the Alphas?
> ... a bit of directivity due to environmental conditions

I wonder.

One curious fact supporting this is the noise blanker drop
factor.  This is the proportion of time the blanker is active.

The drop factor is always a bit higher on the new rx than
the old when I run the two signals through independent sferic

The blanking threshold is set relative to the noise floor,
which is tracked by an asymmetric moving average.  The new rx
must have a lower threshold to have a higher blanking factor,
therefore vtblank is finding a lower floor (relative to the
sferics) on the new rx compared with the old.

So, the E-field probes are not quite omni-directional perhaps?

I need to look at more signals, from different directions,
to build a picture.

Paul Nicholson

<Prev in Thread] Current Thread [Next in Thread>