Then, tried to bend, loop copper wire for helical shape. After a few research, I chose Quadrifilar Helix (QFH) antenna type.įirst, collected required copper wire (12 gauge, enamel), female RG213 connectors, coax-cable, wood rod etc.
I built Ground Plane antenna in an evening because this is easy to build.Įach antenna element = 51 cm, used old N type RG213 male connectors for assembly.Īfter tuning and trials, I track and tuned NOAA-15 satellite signal successfully.īut the decoded image was noisy and not good.Īfter several attempts, I realized that a good antenna was required for better reception. What I need was an external antenna for 137~145 MHz reception. It is sample, monitored local GSM freq band and adjusted error. After finished installation of all software, I calibrated freq ppm error with these instruction. Most of rtl dongles have more or less tuning freq error.
I remember an article about tracking hobby, educational satellites with rtl-sdr. It was a chance to make, test something while waiting for the matches. How World Cup was related to RTL-SDR testing? Due to the east and west time zone differences, local time for match schedule in my country (Myanmar) is beyond midnight. Yes, last month, World Cup 2014 began on June and ended on July. After leaving my RTL-SDR for one year, last month, I had a chance to test it again.