Amateur Low Frequency band at 137kHz
See the images I have captured and the record I have kept of the following:
Antennas for LF and VLF
1) My experience with Loop antennas
2) Theory of Umbrella Antennas
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:
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.
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:
NASA Inspire http://image.gsfc.nasa.gov/poetry/inspire/index.html
How to contact me
E-mail: John at [email protected]
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