A postdoctoral engineer loves FPGAs, MCUs, Linux, RF, highspeed systems, also a ham radio operator, Chinese callsign BG3MDO, UK callsign 2E0IDO.
Cambridge, England
Joined September 2010
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Weekend project, HF band balun for a telescope V Ant. Good spec got, 0.2dB insertion loss, <1:1.1 SWR, common mode rejection still around 20dB at 50Mhz
Fix 5313A frequency counter. The failure was due to a bad SRAM and RAM WR/RD 74 logics. The problem caused system hang and reset issue. Also changed all electrolytic caps, hope it will last long.
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Soft faulty, cool boot may RAM fail. Remove other loads but main logic board, power cycles may be okay boot. Before do more on reset signals and power rail trans ripple check, I decide to replace all electrolytic caps on the bad Delta PSU.
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Day to visit Tianma Telescope (Shanghai 65m Radio Telescope), the main station of Chinese VLBI Network
Yuan Wang, 2E0IDO & BG3MDO retweeted
Testbench is passing for #polyphase channelizer for #Haifuraiya, an #opensource #HEO or #GEO communications #satellite design.
Prototyped on #hamradio bands with a 5 GHz uplink and 10 GHz downlink. Shown is the transponder receiver filter.
ALT Green glowing logic traces on black background, running on a VM at Remote Labs West, a remotely accessible FPGA lab at Open Research Institute. Remote Labs has large FPGA and ADI RFICs, a full Vivado license, and is free to use for open source work
