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Message-ID: <698537.91872.qm@web63604.mail.re1.yahoo.com>
Date: Sat, 21 Nov 2009 09:11:23 -0800 (PST)
From: Andy - KU4XR <ku4xr@yahoo.com>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <785212.33618.qm@web28105.mail.ukl.yahoo.com>
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Subject: Re: LF: WSPR BEACONS - Carrier topic
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Hello all:

Mal made reference to the WSPR carriers coming on, and going off
as a source of QRM to the CW OPs. I'm curious; how much bandwidth
does a carrier occupy ??? Further, a modulated carrier with the
intelligence 1,500 cycles from the carrier center ferquency ???
Which carrier would produce the most adjacent frequency QRM;
a 100 watt WSPR carrier, or a 100 watt 20 Wpm CW carrier ???
Does the On/Off repition rate of the carrier itself coupled with
the power transmitted determine the bandwidth occupied ??? 
Who really causes QRM to a close by station with a strong signal???
Most WSPR OPs are low power; Many CW OPs are " as high as they can
get it ". The issue of carrier related QRM is only related to a 
strong nearby signal that affects receiver AGC. Weak signals are
of insignificant occurence. Using a 500 Hz CW filter; how far
" Down " in dB's would WSPR tones be attenuated  if you're 
operating 100 Hz away from the WSPR carrier ???



Andy - KU4XR - EM75xr - Friendsville, TN.
LOWfer Beacon " XR " @ 185.29866 KHz ( QRSS-60 )
Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
http://www.myspace.com/beaconxr