Message-ID: <008001c96915$21f2f4d0$0301a8c0@mal769a60aa920>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <PAEFLMFGBDKKCONLMLBICEIJDBAA.ganymede444@btopenworld.com>
Date: Sun, 28 Dec 2008 17:53:03 -0000
MIME-Version: 1.0
Subject: Re: LF: 500KHz QSB
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Good point. Forward thinking
g3kev

----- Original Message ----- 
From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, December 28, 2008 5:35 PM
Subject: RE: LF: 500KHz QSB


> How about QRSS on three closely spaced frequencies at once, perhaps?
>
> 73, Dave G3WCB
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of James Moritz
> Sent: 28 December 2008 17:21
> To: rsgb_lf_group@blacksheep.org
> 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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