http://www.radioradar.net/en/measurements_technics/2_5_ghz_12_digit_frequency_counter_with_add_on_gps_accuracy.html
http://www.radioradar.net/en/measurements_technics/2_5_ghz_12_digit_frequency_counter_with_add_on_gps_accuracy_part2.html
http://www.siliconchip.com.au/Issue/2012/December/A+2.5GHz+12-digit+Frequency+Counter%2C+Pt.1?res=nonflash
http://www.siliconchip.com.au/Issue/2017/October/0.01Hz+-+6%2BGHz+touchscreen+frequency+meter%2C+Part+1?res=nonflash
http://www.sonsivri.to/forum/index.php?topic=62094.0
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