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?

Nope.

Consider a 100V source, a 1 Ohm resistor and a 100 Ohm resistor in series.

The power dissipated by the 1 Ohm resistor is 0.99 W and the power
dissipated in the 100 Ohm resistor is 99 W.

Phrases like "power fed to it" are meaningless word salad.

You can apply voltage and you can apply current, but you can NOT feed power.


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?

Non sequitur.


--
Jim Pennino