Michael wrote:
Dont forget a balanced feedline radiates along the line.

If the currents are balanced, most of the photons are
re-absorbed by the free electrons. OTOH, if the currents
inside a coax feedline are not balanced, an unbalanced
feedline radiates along the line.
--
73, Cecil http://www.qsl.net/w5dxp



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I actually meant to say induced currents not radiated since this is near
field.

Given that the ACA's radiation guidlines talks about near fields and not far
fields its probably appropriate to consider induced currents from open wire
feeders to nearby people.

As most transceivers have an unbalanced output its just as easy to make it
unbalanced at the antenna end of the transmission line anyway unless you
want to use the transmission line as part of the antenna / impedance match.
Then you can be reasonably sure there will be no radiation induced into
humans near your transmission line and be in compliance with the ACA
regulations (and safer for others I guess).



"Cecil Moore" wrote in message
...
Michael wrote:
Dont forget a balanced feedline radiates along the line.

If the currents are balanced, most of the photons are
re-absorbed by the free electrons. OTOH, if the currents
inside a coax feedline are not balanced, an unbalanced
feedline radiates along the line.
--
73, Cecil http://www.qsl.net/w5dxp



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"Michael" wrote in message
...
I actually meant to say induced currents not radiated since this is near
field.

Given that the ACA's radiation guidlines talks about near fields and not
far
fields its probably appropriate to consider induced currents from open
wire
feeders to nearby people.

From memory it specifies maximum volts/area to the distance where person can
gain access to the antenna.

It also mentions a maximum flux/area or it could be a certain induced
current in some standard measurement device I think. I haven't looked at it
for over a year now. It all doesn't matter too much when youre using coax
anyway so then you can use the standard tables they give you.