🚀 go-pugleaf

barr@tramp.Colorado.EDU (BARR DOUG) writes:

> Take a 50ohm coax waveguide of some 100 meters in length. Transmit a sine 
> wave from each end with a 50 ohm impedance amplifier toward the other end. 
> What happens when the two signals collide?  Am I correct in saying the 
> voltages add? 

You can model transmission guides as a linear device and add signals at 
any location. The addition is also a matter of the phase coherency. They 
could subtract if your length is 1/4 wave multiple. To add make it 1/2 
wave. In either case if your sources have perfect impedance the steady 
state is the addition of 2 signals. ANy nonlinearities are easily 
detected as intermodulation (Sum& different frequencies) If they are 
coherent, THen you get a DC voltage (STANDING WAVE) for any non-linear 
effects.

The same holds true for an unterminated or shorted signal path end. 
Microwave or low frequency. When the reflection "collides" with the 
incident wave, you get voltage doubling, depending on whether it is 
multiples of 1/2wave (Open) eg 0 length open circuit is double V...
or 1/4,3/4 etc for shorted ends of the line.

e-...>>>>>>>>>>>>>>>***<<<<<<<<<<<<<<<<<<...e-

Regards,
Tony Stewart/ Unisys Canada  (204)257-9233 All opinions are my own!

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607