Steve, VK2SJA wrote:
I've done some web surfing re this issue and it appears that for EMI
testing they use a wide band RF pickup of some sort and a sprectrum
analyzer. Given that I don't have a spectrum analyzer and that I'm not
concerned with laboratory accuracy is there a simple way of finding out
the level of common mode current floating on your coax?
Yes, there is a simple device that is very easy to build which will detect
common mode current on the outside of coax, and can be thought of as a
'current transformer' plus detector driving a meter. Without calibration,
which would require other test equipment, the device will let you know if
there is common mode current flowing and whether it decreases or increases
after making a change. Other versions are useful for detecting RF current in
things such as above ground telephone cables which could be affecting an
antenna's performance.
Please let me know off- list if you are interested in seeing details.
73,
Geoff
GM4ESD
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