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| To: | <[email protected]> |
|---|---|
| Subject: | RE: LF: 500KHz QSB |
| From: | "Dave G3WCB" <[email protected]> |
| Date: | Sun, 28 Dec 2008 17:35:40 -0000 |
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How about QRSS on three closely spaced frequencies at once, perhaps? 73, Dave G3WCB -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of James Moritz Sent: 28 December 2008 17:21 To: [email protected] Subject: Re: LF: 500KHz QSB 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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