LF: Re: DCF39 from Tasmania

["Alan Melia" <alan.melia@btinternet.com>]

Hi Bob great stuff!! that is a very interesting and useful plot you have.
Well Done. One addition that is often added is a narrow band plot of the
noise, just clear of the main signal. You do seem to have a very quiet
location, so this may not be needed to identify local "miscreants"
:-))...... see Scott Tilley's VE7TIL plots of DCF39.

However in the long term it acts as a very usefull "calibration and
confidence" facility confirming that your aerial sensitivity is still in the
right area. One difficulty with long term propagation monitoring is ensuring
that the receiving station's parameters have not changed. If you can do
that, you are sensibly able to determine when the best strengths are
achieved during the year, and the effects of both small and major
geomagnetic distrubances. Without it you are always wondering whether the
signal has been affected by local weather or an increase in the band noise,
or even a coroded connection (been there, done that :-)) )  etc.

The levels you are seeing suggest that western Europe to VK7 is well within
possibility. It just needs the right conditions for long enough and maybe
the right transmission mode.

Best Wishes
Alan
G3NYK

----- Original Message ----- 
From: "Bob" <vk7zl@internode.on.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, May 03, 2012 8:10 AM
Subject: LF: DCF39 from Tasmania


> I am continuing to monitor DCF39 every day.
> A graph of the received signal strength and a screen capture are
> available on my web page at:
>
> http://www.users.on.net/~bobw/dcf39/
>
>
> Bob  VK7ZL
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