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Accurate calibration of your receiver and sound card is necessary for good results with the weak signal modes in use at LF. Modern receivers with master oscillators that are synthesized to provide all conversion frequencies greatly simplify the process. This article describes a method of making the necessary measurements and adjustments to an ICOM R75 receiver and a sound card, using the ARGO software
 Longwave : Operating Modes/Longwave
Low Frequency VLF ELF
Frequency Calibration for Weak Signal Work is listed on dxzone.com since 2005-09-18
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