RadioBanter - View Single Post - Current in antenna loading coils controversy

October 30th 03, 05:17 PM

On 30 Oct 2003 13:59:54 GMT, oSaddam (Yuri Blanarovich)
wrote:

Richard KB7QHC wrote:

This speaks more of simple Resistive heat loss supported by your own
direct observation of:
I fried the loading coil with 600W into Hustler resonator,
melting heat-shrink tubing and wire at the bottom of the coil.

The point is, if the current was constant or close to it, you would not see the
difference as we see it. Heat rises to the top, if anything the top would be
warmer if the current was constant.

Hi Yuri,

Your testimony contradicts your sentiments. You offer
incontrovertible evidence of heat at the bottom of the coil explicitly
in your statement above, and this below:

Simple way to test it, transmit 100W to 80m Hustler resonator, and feel the
coil. Even insensitive people can feel the significant difference in
temperatures. Put 500W to it for longer period and watch the heatshrink tubing
shrivel from the bottom up. This eliminates all the "errors" with meters to
prove the point.

You are using a thermocouple which is sensitive to heat, the heat of
coil loss will inflate the reading. You have twice offered heat at
the bottom of the coils that correlate strongly with inflated current
values from a caloric sensor. You have no other thermocouple data
supporting the nature of the current distribution, just the isolated
section you find attractive. Put simply, your measurements have no
reference (readings from the entire length of the radiator).

You went to some trouble to offer testimonial from reference sources
on the nature of that distribution, but you did not measure it confirm
your testing. Two readings in isolation do not prove you have 100mA
into the bottom when there is only one reading below the coil.

If you are not interested in obtaining those remaining readings of
that current distribution, then you have a poor case.

73's
Richard Clark, KB7QHC