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After some correspondence with Charles Counselman, W1HIS, I have been
made aware of serious short comings in my testing procedure. Charles pointed out that I could not make accurate enough to insure that what I was measuring was in fact TI and not common mode effect due to micro imbalances in my equipment. Upon further thought and reflection, the fact that placing a number of ferrite beads along coax stops the "ingress" suggests that Charles is correct and that it is common mode effects I am measuring. From some simple tests to check the balance of my BALUNs, I am convinced that I have errors of at least 15%. Even my trusty R390's balanced input is far from a "perfect" balance over the 5000KHz to 30MHz frequency range. Charles Counselman's research into common mode effects and how to reduce it are a God send to my receiving pursuits. http://www.yccc.org/Articles/W1HIS/C...S2006Apr06.pdf I am grateful for his help in understanding where I went wrong. And I am sorry for any confussion I may have caused. For a very inexpensive aid in RFI/EMI reduction, check out http://www.hosfelt.com/, scroll down to filters and take a look at the CURTIS, Mfg.# - F1600CA03, 3A filters. These have been a great help in stomping RFI before it gets started Terry |
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