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LF: What Frequency

To: "rsgb" <[email protected]>
Subject: LF: What Frequency
From: "mal hamilton" <[email protected]>
Date: Tue, 25 Jan 2011 15:30:39 -0000
Reply-to: [email protected]
Sender: [email protected]
VLF/LF
Beware of invalid activity on some frequencies. When tuning across a frequency range with a narrow band RX say from Low to High, use a spectrum display and look out for activity that is going in the wrong direction ie Hight to low these are IMAGE frequencies and invalid.
Using a wideband display these Images will appear along side real signals but you cannot be sure what is real. Sound cards are probably vunerable to this problem except precautions are taken.
Depending on antennas, mixer products or sampling rates Images will appear even on High Quality receivers like W&J and others.
BEWARE
de G3KEV
 
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