Hi Stefan,
Understood and I would like to try an
active E-probe soon. I also believe that I have experienced the amusing side of
homebrewing enough and now I think I will choose a more reliable way to get
some results, even with less fun J. So could you kindly suggest any
ready-to-use E-probe to buy (at a reasonable price)?
BTW, any near-future plans for new
trials on 9KHz?
Cheers
D.
From: [email protected]
[mailto:[email protected]] On
Behalf Of Stefan Schäfer
Sent: giovedì 15 aprile 2010 16.03
To: [email protected]
Subject: Re: LF: Amplifier
required for LF DX/weak signals?
Hi Daniele,
I mean, it depends on the surroundings and the space you have for an (RX)
antenna. If you live in the nature, e.g. in a farmers house without electrical
energy except a solar panel, battery and your RX a loop is a good choice. If
you live in a noisy city without much space for big antennas and without the chance
to get a good distance to all cables and QRM sources, a tiny active E-field
antenna, as high as possible above the roof of your house will probably work
better.
Generally, each amplifier has its own noise level and may even decrease the SNR
if not well dimensioned.
Normally, each ham QTH is something between perfect and miserable, so in many
cases experimenting makes sense :-) There are several LFers with passive RX
antennas and very good reception possibilities!
73, Stefan/DK7FC
Am 15.04.2010 15:26, schrieb Daniele Tincani:
Hi LF,
Quite a general question: is a pre-amplifier needed
in your opinion for listening to LF weak signals (e.g. NDB DX, etc.)?
I read different opinions in very famous articles on
the Web: one opinion is that a bigger non-amplified loop is better than a
smaller amplified loop and an amplifier should be used only if really necessary
(and only with the strictly required gain). On the contrary, another famous
article says that an antenna pre-amplifier is important for NDB DX, despite it
mentions quite a big loop as the antenna. I’m just a beginner in LF and
NDB listening with quite a simple system. I tried an homebrew amplifier
together with my small loop and it seemed to me that it did not add anything
but loudness to both the signal and the noise. Basically, no improvements in
signal readability. What’s your opinion, in particular when cheap
portables (e.g. DE1103) are involved?
Best regards
Daniele
