Reg Edwards wrote:

Reflected power is a mere fiction.

Fiction may not be the right word, but reflected power is certainly a
*useless* thing to calculate.

Power which is not radiated from an antenna never actually arrives
there. In fact it never leaves the transmitter.

Agreed.

After the first microsecond the transmitter is operating into a
steady-state load impedance. The only *useful* question then is: "Given
that particular value of load impedance, how much power can my
transmitter generate?" But that isn't an antenna/transmission-line
problem at all - the answer lies in the transmitter, and *only* the
transmitter.

As far as the transmitter is concerned, it doesn't matter how that
particular value of load impedance was created. There are several ways
to create a specified value of (R +/-jX), and whichever way it's done,
the transmitter will deliver exactly the power.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek

Ian White, G3SEK wrote:
After the first microsecond the transmitter is operating into a
steady-state load impedance. The only *useful* question then is: "Given
that particular value of load impedance, how much power can my
transmitter generate?" But that isn't an antenna/transmission-line
problem at all - the answer lies in the transmitter, and *only* the
transmitter.

Using 200 ft. of unterminated RG-58 on 440 MHz, the transmitter
sees close to 50 ohms and can deliver its full rated power into
the coax with no antenna. Therefore, I seriously doubt that your
question above is the "only *useful* question".
--
73, Cecil http://www.qsl.net/w5dxp



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