Hello Everyone,

There's one thing I need to know for the purpose of my simulation
- that is the order of magnitude for currents/voltages inducted
in the antenna, or, to be more precise - answer for the question below:
can termination of the transmission line be simulated in Spice as
voltage generator (VSIN) with 75 Ohm internal impedance and particular
frequency AND amplitude ? What amplitude could it be ?


Best Regards,
Peter

Antey wrote:
There's one thing I need to know for the purpose of my simulation
- that is the order of magnitude for currents/voltages inducted
in the antenna, or, to be more precise - answer for the question below:
can termination of the transmission line be simulated in Spice as
voltage generator (VSIN) with 75 Ohm internal impedance and particular
frequency AND amplitude ? What amplitude could it be ?

Are you simulating a receiving antenna or parasitic elements?
The main wave in an ordinary transmitting dipole is conducted,
not inducted.
--
73, Cecil http://www.qsl.net/w5dxp

Are you simulating a receiving antenna or parasitic elements?
The main wave in an ordinary transmitting dipole is conducted,
not inducted.

I am simulating an amplifier :O) - and I just need a sensible
excitation for it; I figured out that described source can do it,
but I would like to know if I am right or not.

Best Regards,
Peter

Peter wrote:
"What amplitude can it be?"

A receiving antenna has a radiation resistance. The load which extracts
most power is a conjugate match for the antenna. With radiation
resistance perfectly matched to receiver input resistance, the radiation
resistance becomes the Thevenin equivalent source resistance feeding an
identical receiver input resistance. 1/2 the voltage induced into the
receiving antenna is used to re-radiate energy received by the antenna.
The other 1/2 appears across the receiver`s input resistance.

For a professional explanation of this topic, see Kraus` 3rd edition of
"Antennas" page 32. "All about antennas at a glance".

Best regards, Richard Harrison, KB5WZI

Cecil Moore wrote:
The main wave in an ordinary transmitting dipole is conducted,
not inducted.

That's right. To be inducted requires a vote of the academy. :-)

jk