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Armin.G vor 2 Stunden
May be my old Artob Projekt from the mid 90 's is interesting also. German : English : Regards Armin  
Multi-Purpose Data Acquisition Board for a Sounding Balloon [130082]
BreedJ vor 20 Stunden
Firmware version V1.3 has been released with some new functionality.  Changes:   Less memory consumption for both flash and dram. Estimated error displayed. Far more samples per measurement, 14500 instead of 3500. Calibration function added. 20 calibration points can be added.  Serial plotter of arduino IDE can be used to display measured power in time. See the manual for more details about the calibration.  
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
phase2682 vor 21 Stunden
I have the older four digit version and I notice it is also about one second faster than WWV
6-digit Nixie clock [150189]
BreedJ vor 22 Stunden
The slope is 22.33mV per dB (22mV according to the datasheet).  If you measure 0,75V when connecting -20dBm input power then DBM_at_0V for that frequency will be: dBm_at_0V = 'Known input power' + ('measured voltage' / slope) -20dBm + (0,75V / 0.02233V) = 13.59 dBm Be sure to do measurements in the linear region (between -10dBm and -45dBm)  
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
rjv vor 23 Stunden
You will be needing four of these kits: led filaments are not included: buy a cheap led filament lamp and tear out ( carefully: they tend to break!!) the led filaments.
160205-scoreboard\timer with leditron modules