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Roger
In your case from what you say it would be a good
idea to move to the VHF/UHF region, others should consider your
advice.
Why struggle on LF/MF when you could do better with a
lot less power on the microwave bands.
I got a lot of pleasure using satellites for
communications since the OSCAR 6 es OSCAR 10 days.
I hold the record on OSCAR 6 for
distance, HONGKONG to Melbourne.
de Mal/VS6HI/G3KEV
----- Original Message -----
Sent: Wednesday, August 03, 2011 8:01
PM
Subject: Re: LF: Antennas
Mal
You may be right about big antennas in a decent,
quiet rural location but the majority of us now live close to modern
civilisation with noise floors that have risen some 20-30dB or more at the
lower end of the spectrum in recent years.
Top Band is almost unusable
here and 80m not a lot better. I am surprisingly lucky on 500kHz and 136kHz
where I seem to be able to hold my own on receive with my loop antenna in its
favoured directions. Many get very good results with PA0RDT type E-field probe
antennas with careful location and after efforts to minimise noise pick-up. In
the end S/N is all that matters so having a large antenna which increases both
wanted signal and noise has no benefit as long as the S/N is as good as
it can be.
With more and more difficult noise environments in most
urban and semi-urban locations I can see many people giving up amateur radio
below 432MHz. I am tempted more and more to move up to the UHF and
microwave region to get my next challenges and I live on the edge of a village
where the noise must be far less of an issue than for my city
friends.
A little more understanding of the plight of many LFers in
busy cities and some encouraging words and ideas would be good
Mal.
73s
Roger G3XBM
On 3 August 2011 19:08, Chris <[email protected]>
wrote:
Hi Mal and LF,
Well, all I can say is that here the signal to
noise ratio on RX is better on my PA0RDT than it is on my long wire
(inverted 'L'). I have always thought this a bit strange, quite often weak
signals that cannot be seen on the wire are perfectly copied on the PA0RDT.
This applies from 136kHz to 3.8MHz. I cannot see what else it can be other
than local noise/QRM level. 80m is another prime example where the noise has
gradually got worse over the years here.
Vy 73,
Chris, G4AYT, Whitstable,
Kent.
--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
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