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My english still very bad, but i should tell here about my experiments.Your English is good enough to write this, which is reasonably high. I can see that you paid attention in English class.
Common mode noise i measure between PC case and grounding in 9 floor building via 10:1 voltage divider - almost 13 volts.
http://hoshinokoe.ru/files/0ARTICLES/common_mode/interf_pc_case.jpg
I still not measure this long balun, but it seems t be its better then only miniature transformer.
Today i made a Austin tranformer for HF to measure its reactance for common mode.
http://hoshinokoe.ru/files/0ARTICLES/balun_for_SWL/Austin_trans_isolation.jpg
...
Now i use "long" balun with my personal sdrs and parallel with web-sdr on my personal webpage.
Deltracks, rarely adding 'International'
2125 UTC-OFF
Caught a mention of "Psychotic piece of S**t"
Professor Plum wouldn't be related to P.G. Wodehouse would he? Wodehouse was a man who made a living on stories about fools. He wasn't a professor but his friends called him "Plum". If you can find it, read his short story, "The Great Hat Mystery". It explains a lot about the British upper class.Professor Plum and Miss Scarlett are on the show together. I don't have a clue about the other one.