Welcome to the web site of G4CNN
On this page you will find a brief overview of my interests in Amateur Radio and some other topics which might also be of interest to you. To activate a link click on the picture or text below it.

New on this site 2002 April 4:
*Standard Units and Conversions of units and formulae for Radio
*Construction of "Marathon" QRP transmitter for LF

Amateur Low Frequency band at 137kHz


Antennas for LF and VLF


1) My experience with Loop antennas

2) Theory of Umbrella Antennas

My Station

Loading Coil and Variometer

Long Wave and VLF

Would you like to know what all those stations are down there?
Follow these links to find out and see some images as well:

Low Frequency

Very Low Frequency

Doing without the Smith Chart

Reprint of article from EARS Newsletter

Loran Lines and other Spurii

1) Picture of Loran lines obtained using Spectran. Loran-C is a high power navigation system transmitted on 100 kHz using a Spread Spectrum technique which produces sidebands across the whole of the LF spectrum. When using narrow band weak signals  to communicate over great distances, it is important to avoid these lines.A table is presented of Loran line frequencies within the 136 kHz band both for Europe
and for the Canadian East seaboard.

2) Spurs resulting from interactions between the German DCF42 and DCF49 transmitters. These spurs can interfere with reception of weak signals in Germany.


Inter Modulation Products are produced in a Receiver and/or Pre-amp as a result of non-linearities in the equipment. When identifying weak signals it is important to know which are real and which spurious. This table lists the potential IMPs that I must look out for at my location.

Hieroglyphic font for Word for Windows

Nothing to do with Radio, but might be of interest to you.
Allows you to write and print Ancient Egyptian texts using Word.

PC Planetarium

Use your PC to display the stars and planets as seen from any location at any time.

Other Web sites

If you are interested in LF, VLF or even lower frequency Radio communication the following sites have a lot to offer:
CT1DRP   http://homepage.esoterica.pt/~brian
DF8ZR   http://home.t-online.de/home/Bernd.Grupe/homepage.htm
DK8KW   http://home.t-online.de/home/dk8kw/
DL1SAN   http://www.qsl.net/dl1san/
G0MRF   http://www.g0mrf.freeserve.co.uk
G3XTZ   http://www.lf.thersgb.net
G3YMC   http://www.btinternet.com/~dsergeant/136.htm
G3YXM   http://www.wireless.org.uk/index.htm
GW4ALG   http://www.alg.demon.co.uk/radio
G4FGQ   http://www.btinternet.com/~g4fgq.regp/
I5TGC   http://www.dadacasa.com/i5tgc
KI0LE   http://www.computerpro.com/~ki0le/pages/lowfer.htm
NASA Inspire http://image.gsfc.nasa.gov/poetry/inspire/index.html
OK1FIG   http://www.mujweb.cz/www/ok1fig/136k.htm
ON7YD   http://www.qsl.net/on7yd/136ant.htm
SM5PXY   http://home5.swipnet.se/~w-54761/fs.htm
SM6LKM   http://home4.swipnet.se/~w-41522/
SV1XV   http://w4u.eexi.gr/~sv1xv/lw.htm
VK2ZTO   http://www.qsl.net/vk2zto

How to contact me

E-mail: John at [email protected]

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