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Jeff replied to Doug Walmsley's discussion GPS Issues - Do I need a GPS Ground Plane & EMI Ring?
"How are the locations and sizes of the small cuts on the perimeter of the patch for tuning are determined?  I understand the patch is tuned in real time while viewing a network analyzer but how is it know where to place the cuts and how many are…"
Jan 21, 2016
Jeff replied to Dimitris's discussion Vertical speed sensor? (variometer?)
"A resolution of 0.1 knot is impressive Marc.  Can you describe the specialized code you use to pull the signal from the noise?"
Jul 28, 2014
Jeff replied to Chris Anderson's discussion Discussion forum for UAVDevBoard, Sparkfun's 3-axis IMU-based autopilot board
"Would there be any interest in adding an angle of attack sensor and a crab angle sensor to MatrixPilot? I envision two simple wind vanes attached to potentiometers to detect the angle of the wind in the horizontal (cross wind) and vertical…"
Apr 20, 2010
Jeff commented on William Premerlani's blog post Video of IMUDOT demonstration of the direction-cosine-matrix algorithm
"The smoothing method you use is actually described on the below page. It is the section that begins “Here is another method:, which actually has better numerical convergence properties at the expense of little more calculation.” It is a cleaver…"
Apr 21, 2009
Jeff commented on William Premerlani's blog post Video of IMUDOT demonstration of the direction-cosine-matrix algorithm
"I see the MMA7260 accelerometer has four g-selects: 1.5g, 2g, 4g, 6g. The UAV DevBoard is configured for 1.5g according to the Sparkfun schematic, did you keep the 1.5g setting on your board? I am looking at the accelerometers from Analog,…"
Apr 21, 2009
Jeff commented on William Premerlani's blog post Video of IMUDOT demonstration of the direction-cosine-matrix algorithm
"Louis, can I ask what model accelerometers, gyros, and magnetometers you use for your IMUDOT? Do you apply any analog or digital filtering (poles, cut off frequencies)? What ADC sample rate do you use for the sensors?"
Apr 21, 2009
Jeff replied to Chris Anderson's discussion Discussion forum for UAVDevBoard, Sparkfun's 3-axis IMU-based autopilot board
"Your roll-pitch-yaw demo is absolutely excellent!! I was wondering if might be able to post a video showing the board moving in conjunction with the servo output? Do you have an estimate of when the paper discussing the theory and math will be…"
Mar 17, 2009