This short article describes some experiences I had when trying to cure the very bad pager interference I had.  Examples of this interference can be seen on my pictures.  I've split the article down into four sections to make it a little easier to read online.

• The initial analysis describes the problem, and an early successful attempt to cure it
• New antenna - new problems describes what happened when I go an outside antenna
• Modifying the RX2 details changes I made in this excellent receiver to improve its strong signal handling
• A novel Helical Resonator Notch Filter to reduce pager interference
• The blow-by-blow measurements

If you have problems with computer-related interference appearing on your picture you may want to look at this note on reducing computer interference.  If you are uncertain what type of interference you have, this article "Interference to APT/WEFAX Weather Satellite Reception" by Alan Sewards may help.

Acknowledgements

Ray Godden and Bob Barnes provided useful input and were supportive throughout.   Special thanks to Dave at work for the loan of the spectrum analyser.

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Copyright © David Taylor, Edinburgh

Last modified: 2007 Dec 23 at 15:16