k1drw wrote:
Can someone please provide guidance for this issue:

a snippet from the SGC website:
"One of the great misunderstandings in checking grounds is
that just because you measure continuity with a VOM, that you will have
a good RF ground. You MAY have a good RF ground, but a DC measurement
doesn't prove it. Remember, if you measure the resistance across an
inductor, it will show zero DC resistance to ground even though it's
impedance at HF frequencies may be quite high. Continuity is a good
check, but it does not certify your RF ground system."

I would like to understand how/what to definitively measure before and
after I make improvements to my mobile HF system (additional
bonding/grounding). What metric will provide clear indication that I
have indeed made an improvement. I do have an MFJ-259 available. I
have been exclusively looking at the SWR for indication but I am
starting to learn that lowering the SWR is not necessarily an
improvement. Is it to simply to measure the mobile vertical feedpoint
impedance before and after ?

73, dennis, k1drw


Dennis, assuming you've already done at least some "bonding and
grounding," further measures may have a fairly small incremental effect
on loss resistance and efficiency. The MFJ-259 has a resolution of one
ohm and the uncertainty of that LSD is probably more than an ohm. You
may not be able to reliably detect small improvements using the MFJ.

These issues may be less troublesome if you use field strength
measurements to detect changes.

Plan carefully, because once you make a change in the system, it is a
pain to have to un-do it in order to apply a different measurement
technique. Will you share your results?


73,

Chuck

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