Analog video monitor simulator?

Question

Electronics

There is a monitor, a portable Chinese non-name, I use it to connect to analog cameras.
The monitor continuously checks for the presence of a video signal, AV1, and if you pull out the wire, it instantly understands that there is no signal, writes no signal and switches to another video input.
To go back to AV1, you need to climb into the menu and switch to AV1 there.
Because I turn the camera off and on, I have to constantly poke buttons in the menu and switch inputs.
Annoying right.
Is there any simple circuit that would simulate the constant presence of a video signal at the monitor input so that it does not try to switch?
Any resistors to hang there or something like that? Google is too modern for such questions.

Answer 1

If it doesn’t help (the monitor looks pathologically smart) a constant signal shift from 0, then it will be necessary to emulate at least horizontal pulses .

Answer 2

I don’t know about current ones, but older monitors understood that they were connected to an analog video signal source by the presence of a resistance of 75 ohms (or less) at the analog input.
First, arrange a test: connect a 75 ohm resistor to the input, set the AV mode in the menu, and if the monitor does not jump off it, well, that means it is.
Then you will have to make a cable adapter with a 75-ohm resistor built into it.
And if it does not work out - well, it means that the monik is really too smart.