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Re: LF: Active E field antenna versus T antenna for LF/MF reception

To: [email protected]
Subject: Re: LF: Active E field antenna versus T antenna for LF/MF reception
From: [email protected]
Date: Fri, 18 Sep 2015 18:02:45 +0000
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Internet Messaging Program (IMP) H5 (6.1.7)
Same here... I get the “attack page” warning.

Using latest Firefox 40.0.3


Paul-Henrik OH1LSQ



Quoting John Rabson <[email protected]>:

DJ8WX’s page referred to below is reported by my system to be an “attack page”.
John F5VLF

On 18 Sep 2015, at 19:00, [email protected] wrote:

hi Stefan,
pse see

http://dj8wx-dl.de/two.htm


Uwe/dj8wx


Von: DK7FC <[email protected]>
Gesendet: 15.09.2015 16:17
An: <[email protected]>
Betreff: LF: Active E field antenna versus T antenna for LF/MF reception

Hi all,

Since a while i'm now comparing RX results between two omnidirrectional
E field antennas. One of them is active (similar to the PA0RDT antenna),
the other one is a T antenna, resonanted to the frequency of interest
and matched to 50 Ohm... (So the T antenna could be used for
transmitting). The small active antenna is inside a plastic tube, so
(charged!) raindrops do not fall on the probe directly. The charge can
flow to ground through the weak conducting water layer (probably in the
range of 1E8 Ohm?).During rain i saw that the "QRN" was significantly
higher on the T antenna.

So, could it be a better idea to use an active antenna (with a limited
large signal capability and a non-perfect linearity!) instead of a
"real" or "traditional" band-selective T antenna? Maybe worth to compare
the results on a stereo RX ;-) I my imagination i see the active antenna
with an umbrella to protect from rain (charged drops, |q| > 0). As
higher the distance between probe and umbrella, the better the noise
reduction and the lower the signal loss?
Time to build and test the performance of an active E field probe
consuming 5V/1mA...
Just some thoughts...

73, Stefan

[email protected]

Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE



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