Re: LF: lf andnoise and offshore.

["Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be>]

> What is the longest sec/dot size
> that is used on amateur LF ?
> I noted that Rik's QRS program offers up to 60 sec per dot.
> Are there programs with much longer sec/dot times out there
> ?

Hi Peter,

You must have found a very old version of QRS (2.05 or even older).
Versions from 3.05 upward support up to 3600 sec dotlength (= 1
hour).

The latest version of QRS can be downloaded at various places :
G3YXM :
http://www.wireless.org.uk/software.htm
LWCA :
http://www.lwca.org/library/software/index.htm
NL9222 :
http://home.wanadoo.nl/nl9222/software.htm
ON7YD :
http://www.qsl.net/on7yd/
(click on software)

73, Rik  ON7YD

PS :
If there is any need I am willing to extend the maximum dotlength, if someone can convince me of the use of it.
I believe the ultimate limit can be calculated as :

• Ham gets licenced at the age of 16 and dies at the age of 100 (I'm an optimist), so his "ham life" is 84 years (= +/- 44000000 minutes)
• An average QRSS QSO at 3 sec/dot takes 25 minutes
• A dotlength of +/- 5280000 seconds (= +/- 2 months) would allow an average QRSS QSO in a span of 84 years

This would improve SNR by 62 dB (+/- 10 S-points) over QRSS3 but would require a TX and RX stability of 0.2 µHz (micro-Herz). Also forget about ionospheric propagation as the doppler-shift will ruin everything.