"gareth" wrote in message
...
Actually, here is a better example, because it represents the situation
found in many shacks.
Consider 100W at 3.6MHz propagating along some 50 ohm
coax, which terminates suddenly but with 1/4 inch of the central
conductor protruding, and thereby forming a short antenna.
The short antenna, only 1/4 inch long is immediately terminated
by a 50 ohm resistance.
1. How much of the power from the coax is fed into that short antenna
despite
the claimed (by others) impedance mismatch?
2. How much of that power is radiated by that short antenna?
3. If all the power that is fed to the short antenna is radiated, does
the
50 ohm resistor dissipate any of it?
4. How much of the power is dissipated in the 50 ohm resistor?
5. How much of the power is reflected back down the coax because
of the impedance mismatch of that (very) short antenna?
6. Of those who claim that a short antenna will radiate all the power fed
to it,
how many will realise that for any power to be dissipated in the resistor,
it must
have been successfully fed to that short antenna in the first place?
7. Of those who suggest that impednace matching is a serious
consideration, how
many will realise that at 3.6MHz, that the 1/4" short antenna is the
standard practice to
connect the end of the coax to the dummy load with a bit of wire?

Setting aside dielectric and slot antennae, an antenna is a conductor into
which
power has been passed.

Once the power has entered that antenna, how it got there by feed, and how
the
antenna is terminated are irrelevant. In the example above, the short piece
of
wire coupling the coax to a dummy load is a short antenna, and yet it
clearly is
not radiating all the power being fed to it, as most of it will be
dissipated in the
dummy load.

Nevertheless, it is a valid example of power being fed to a short antenna
which is
not all being radiated, because a short antenna does not radiate
efficiently, which is
where we came in.

gareth wrote:
"gareth" wrote in message
...
Actually, here is a better example, because it represents the situation
found in many shacks.
Consider 100W at 3.6MHz propagating along some 50 ohm
coax, which terminates suddenly but with 1/4 inch of the central
conductor protruding, and thereby forming a short antenna.
The short antenna, only 1/4 inch long is immediately terminated
by a 50 ohm resistance.
1. How much of the power from the coax is fed into that short antenna
despite
the claimed (by others) impedance mismatch?
2. How much of that power is radiated by that short antenna?
3. If all the power that is fed to the short antenna is radiated, does
the
50 ohm resistor dissipate any of it?
4. How much of the power is dissipated in the 50 ohm resistor?
5. How much of the power is reflected back down the coax because
of the impedance mismatch of that (very) short antenna?
6. Of those who claim that a short antenna will radiate all the power fed
to it,
how many will realise that for any power to be dissipated in the resistor,
it must
have been successfully fed to that short antenna in the first place?
7. Of those who suggest that impednace matching is a serious
consideration, how
many will realise that at 3.6MHz, that the 1/4" short antenna is the
standard practice to
connect the end of the coax to the dummy load with a bit of wire?

Setting aside dielectric and slot antennae, an antenna is a conductor into
which
power has been passed.

Once the power has entered that antenna, how it got there by feed, and how
the

Power does not enter an antenna, voltage and/or current enter an antenna.

antenna is terminated are irrelevant. In the example above, the short piece
of
wire coupling the coax to a dummy load is a short antenna, and yet it
clearly is
not radiating all the power being fed to it, as most of it will be
dissipated in the
dummy load.

As Ohms law says it should because of the impedance of the antenna compared
to the impedance of the resistive load.

Nevertheless, it is a valid example of power being fed to a short antenna

There is no such things as "power being fed to" anything; you can only
apply voltage or current.

The only place were power is fed is in Star Trek.

which is
not all being radiated, because a short antenna does not radiate
efficiently, which is

You have been shown repeatedly that this is false.


--
Jim Pennino