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Matthias Pleschinger
Matthias Pleschinger il y a 6 heures
Hi, your nwatch is great. I would like to build it on my own based on your article. But I have a problem to find the right touch panel and the S1-S3 buttons. Can you please give me further information or links where you have bought these parts? Thank you very much! Matthias
nWatch - build and program your own smartwatch [160326]
BreedJ
BreedJ il y a 1 jour
Hi Mans, Unfortunatly I do not own equipment with frequencies higher than 1GHz. I posted new firmware which contains the possibility to do your own callibration when you have the equipment for it. Maybe someone else reading this and owning the equipment can help us out. joost
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
TonGiesberts
TonGiesberts il y a 1 jour
This part of the circuit is in principle not any different from other oscillators. Part of the output signal is coupled back to the input of the driver. If the gain is sufficient it will cause oscillation at whatever frequency the circuit is tuned to. The current through R28 is the same as is flowing through the air (the discharges) and returns through parasitic capacitances to the mains and the AC adapter and thus ground of the circuit. At 4 MHz these capacitances can be small. Since the current is very low voltage drops, compared to 30 kV, are negligible.    
Spiral MicroTesla, USB powered [160498]
TonGiesberts
TonGiesberts il y a 1 jour
It’s possible to change the installation of  Volumio 1.55 to have the main menu item ‘Turn off visible when the rotatiion of the display is normal. It’s much like changing the zoom level of Midori in the RuneAudio project update. All it takes is to change the command line that opens Midori in Autostart:   In ~/.config/lxsession/LXDE-pi/autostart change the line  midori -e Fullscreen -a http://localhost   to  midori -e Fullscreen & ZoomOut & ZoomOut -a http://localhost   It will make Midori zoom out twice. Once would be enough but the button Turn off isn’t completely visible then and maybe an option if some letters are getting to small. The photograph shows the result with zoom out twice.  
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
Mansueto Grech
Mansueto Grech il y a 2 jours
Hi Joost, Unit assembled an working Fine. I have a question If I may. Is it possible to substitute the pre defined  power calibration  with new Frequencies. As I would like it to be calibrated on the Ham Bands and mainly 144, 432, 1296 2304 5700Mhz. and possibly 10Ghz. Thank you in advance  regards Mans.
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range