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Weak Signal Modes in Amateur Radio

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Andrew Rohne

Presentation to the Milford Amateur Radio Club on weak signal modes, specifically JT-65, WSPR, and QRSS.

Self Improvement
1 of 19
Weak Signal Modes Andrew Rohne AC8JO February 9, 2012
Three Part Presentation ,[object Object],[object Object],[object Object]
JT65 and WSPR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
JT65 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Less sensitive More resistant to libration fading & frequency drift
JT65 ,[object Object],[object Object],[object Object],[object Object],[object Object]
JT65-HF Software
JT65 QSO (with N1FIY) N1FIY AC8JO EM79 N1FIY AC8JO R-09 N1FIY AC8JO 73
JT65 post-QSO
JT65 QSO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(QSO Stolen from NW7US.US/jt65a.html)
WSPR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
WSPR Software
WSPRNet.org (Spotting)
Spotting Map
Spotted! 206 mi per watt
Spotted Map
QRSS ,[object Object],[object Object],[object Object],[object Object]
Software
Website - “Pensacola Snapper”
Conclusion ,[object Object],[object Object],[object Object],Andrew Rohne AC8JO www.ac8jo.us

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Weak Signal Modes in Amateur Radio

Editor's Notes

  1. JT65 the most, then WSPR, and a little QRSS
  2. Time sync is critical. 15 seconds off means no decode! The TX sequence is long. Make sure your rig can handle it. WSPR is 2 minutes, JT65 is close to a minute.
  3. Not only is it 13 characters, but it is also a limited character set
  4. FN20 is in N. New Jersey/SE Pennsylvania CM97 is around San Jose, CA