short circuit frequency ?

[erfandl]

Hi everyone. I have a question about short circuit and the AC/at given frequency. does the AC/ at given frequency change when the short circuit occurs? if yes how much the frequency changes ?

thanks.

[Thaelin]

See Antenna Theory.

[erfandl]

What does it have to do with the antenna? :|

[Thaelin]

I am refering to what happens to a sine wave on an antenna shorted cable. It has reflections back to the source.


thay

[stivep]

Hi everyone. I have a question about short circuit and the AC frequency. does the AC frequency change when the short circuit occurs? if yes how much the frequency changes ?

thanks.

Answer for piece of coaxial cable known as transmission line that is shorted open or terminated at the end:
No it will not change.. however it may..cerate transients
it will not change in transmission line but if that  length of the cable represents resonating circuit while  having  LC reactive character than it may also  act as a "mixer" creating by-products.
but hm........ I have never thought  about it....

https://patents.google.com/patent/US5142697A/en
https://www.rf-microwave.com/en/mini-circuits/zfm-2h-s/rf-coaxial-mixer-sma-female-connectors/zfm-2h-s/


when  the coaxial cable  that is connected to OUT of Tx ( transmitter) is shorted it is the  same ( well not  the same but close) as if  there  was no   load connected to its end or the cable was open.
That means  nothing connected to PL or BNC connector at the end of it.

but there is more than that:
The nature of that reflection depends on how the cable is terminated at the other end.
Shorting the cable at the far end produces an inverted reflection. With no termination (an "open" end),
the reflected pulse is not inverted.
When the impedance of the termination matches that of the cable, there is no reflection.


other  important factors :impedance of the cable, the output impedance of the signal source, the length of the cable, etc.
https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electro-Optics/Book%3A_Electromagnetics_I_(Ellingson)/03%3A_
Transmission_Lines/3.16%3A_Input_Impedance_for_Open-_and_Short-Circuit_Terminations

Schort circuited transmission line.
https://www.daenotes.com/electronics/communication-system/short-circuited-transmission-line


answer #1
for regular  short circuit:
https://en.wikipedia.org/wiki/Short_circuit


answer #2
for regular  short circuit:
if  the circuit represents after  it is shorted a resonance circuit with its LC reactive components that  any frequency can resonate with it.
https://www.qsl.net/va3iul/RF%20Mixers/RF_Mixers.pdf
The two signals inserted into the two input ports are usually the Local Oscillator
signal and the incoming (for a receiver) or outgoing (for a transmitter) signal.
To produce [/font]a new frequency or new frequencies requires a nonlinear device.
[/font]In a mixing process if we want to produce an output frequency that is lower
than the input [/font]signal frequency, then i[/font]t is called down-conversion and
if we want to produce an output signal that is at a higher frequency than the input signal,
it is referred to as up-conversion


Wesley