weak signal modes in amateur radio
DESCRIPTION
Presentation to the Milford Amateur Radio Club on weak signal modes, specifically JT-65, WSPR, and QRSS.TRANSCRIPT
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Weak Signal Modes
Andrew Rohne AC8JOFebruary 9, 2012
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Three Part Presentation
JT65WSPRQRSS
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JT65 and WSPR
Both by Joe Taylor, PhD K1JTAstrophysicist at PrincetonNobel Prize in Physics 1993
Time sync CRITICALLong TX and RX sequencesWeak signal - use low power
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JT65
Originally for EME on HF and VHFThree Submodes
JT65A ~> HF and 6mJT65B ~> 2m and 70cmJT65C ~> 23cm
Short, to-the-point QSOs
Less sensitive More resistant to libration fading & frequency drift
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JT65
13 Characters onlyNot a ragchew mode! Allows for signal report and 73
only53 second TX/RX SequencesHF Skywave ~> JT65-HF
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JT65-HF Software
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JT65 QSO (with N1FIY)
N1FIY AC8JO EM79
N1FIY AC8JO R-09
N1FIY AC8JO 73
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JT65 post-QSO
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JT65 QSO
CQ K1JT FN20K1JT W6DTW CM97W6DTW K1JT -18K1JT W6DTW R-16W6DTW K1JT RRRK1JT W6DTW 73W6DTW K1JT 73
(QSO Stolen from NW7US.US/jt65a.html)
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WSPR
Weak Signal Propagation ReporterNot a QSO ModeTransmits call+grid2 Min TX/RX SequencesClock important!WSPRNet.org
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WSPR Software
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WSPRNet.org (Spotting)
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Spotting Map
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Spotted!
206 mi per watt
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Spotted Map
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QRSS
Super Slow CW“Normal” or FSKCWHellschreiber has been used
Not a QSO mode
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Software
QuickTime™ and a decompressor
are needed to see this picture.
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Website - “Pensacola Snapper”
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Conclusion
JT-65WSPRQRSS
Andrew Rohne AC8JOwww.ac8jo.us