Welcome to the N1IR Electronics Website. Totally off the cuff, one take, unrehearsed video projects for anyone interested in amateur radio, electronic design, makers, hardware hackers and science.

Get off you duff and build something!
Training the hand and mind since 1982.

Tuesday, January 29, 2013

KB1EVY Satellite Weather Station

 "Don't Turn It On - Take It Apart" Quote: Dave Jones @ eevblog.com

Thanks to John, KB1EVY for donating a Weather Station that otherwise would of ended up in the trash. With my Seniors we did a reverse engineering of both receivers made around the late 90's date stamp on the IC's. Lesson on PLL's, Linear Supplies , Tuner module, shielding techniques, down converting, geo sync satellites, RF microwave spectrum, Intermediate Frequency, SA602 mixer, etc.

There were even a pressure sensor (0-5V Output) and humidity sensor (0-1V Output) we got up and running with the arduino. The pressure sensor was interesting because it had an ICL7660 CMOS Voltage Converter that took the +12VDC and switched it to -12VDC to power the opamp. Basically with one supply the chip converted it in to a bipolar supply, of course with some current limits. But an interesting way to power an opamp that needed +/- voltage


 Humidity sensor
  Humidity sensor

 Honeywell Pressure Sensor  0 to 15 PSI

 Humidity sensor with Arduino / LCD in background

Yep everything was put back together for the next group :)