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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: 500KHz QSB |
| From: | "James Moritz" <[email protected]> |
| Date: | Sun, 28 Dec 2008 17:20:42 -0000 |
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Dear Gary, LF Group, Quoting from the Propagation chapter of the Admiralty Handbook of Wireless Telegraphy 1938 edition: "It is usually observed that the different frequency components of a modulated wave fade in a manner which is independent of each other. This has been termed "selective fading"... ...The use of ICW ["interrupted continuous wave" i.e. modulated CW as with the NDBs] at H/F is therefore a means of combating fading in telegraphic work." So the idea of increasing the signal bandwidth to combat selective fading is not entirely new... MCW beacons anyone? Cheers, Jim Moritz 73 de M0BMU |
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