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A collection of useful facts by Joel Williams. Adelaide denizen. Computer tinkerer. Former terrestrial ecology student of Flinders University. PhD candidate at ANU. Editor for freshmeat.net. Adelaide University Mountain Club member and outdoor enthusiast. Occasional networking go-to guy. Contact me by email at joel at this domain. |
20100309 MAX2611 LNA test circuitI replaced the filter with Gerard's LC preselector design and replaced the radial RF choke with an SMT part. System gain is now about 14.5 dB. Input -60 dBm, FHS3 reads -66.5 dBm at the MAX2611 input, -45.8 dBm at MAX2611 output. This seems much closer to the expected amplifier performance! Filter loss still a little high. Filter performance seemed good with the tracking generator - 150 may have just been on the edge, but shouldn't have been 6.5 dB down. It's hard to say without being able to calibrate the 'through' test accurately. Could do with an SMA-SMA female joiner (built!).  Tracking generator testAdded a 25 dB pad (Pi, 56R, 440R, 56R) Input -60 dBm, FHS3 reads -71 dBm at MAX2611 output = 25.2 dB attenuation.
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