Nice job ! I have a black and white KTV small portable TV to test my transmitter with. I got a handheld TV but the screen is HORRIBLE but the reciever circuit works so i want to replace the screen with a modern car monitor and see if the picture will look better. I want to have a number of TVs recieving a signal from a game console and have wireless controllers so its like a form of LAN muiltiplayer but with analog TVs instead.
Hi, cool stuff! If it is not a bother, can you give some more information about the triple harmonic you mentioned around 2:50? Is this referenced as something like a 3rd overtone in a crystal oscillator datasheet?
The crystal I used was 22.1184 MHz. In basic oscillator circuits, such as what I used, there is no filtering to prevent the harmonics from getting out. This means that there will be a signal on 22.1184, on 44.2368 (the double harmonic), on 66.3552 (the triple harmonic), 88.4736 (the quadruple harmonic), and so on. Because I did not have a crystal that was of a frequency within the NTSC TV channels, I used this harmonic behavior to my advantage. The problem with my circuit is that there is a signal being produced on all harmonics of 22.1184 (although more distant harmonics are weaker). This is usually solved by adding a filtering circuit that filters only the frequency or frequency range you want, and suppresses the harmonics that you don't want. As for overtones, I have read up on information about this, and if I understand it correctly, then yes, an overtone is another way of referring to harmonic frequencies. And so, a 3rd overtone should be what I have referred to as a triple harmonic.
Hi there can i use a 16.000mhz 2 pin crystal for my transmitter?woud it work and on which channel exaktli?
Well done body, you have much talent in this.
Nice job ! I have a black and white KTV small portable TV to test my transmitter with. I got a handheld TV but the screen is HORRIBLE but the reciever circuit works so i want to replace the screen with a modern car monitor and see if the picture will look better. I want to have a number of TVs recieving a signal from a game console and have wireless controllers so its like a form of LAN muiltiplayer but with analog TVs instead.
Hi, cool stuff!
If it is not a bother, can you give some more information about the triple harmonic you mentioned around 2:50?
Is this referenced as something like a 3rd overtone in a crystal oscillator datasheet?
Made the circuit myself, it works. I used a 20MHz crystal tho but it broadcasted OK to channel 3! thx so much
The crystal I used was 22.1184 MHz. In basic oscillator circuits, such as what I used, there is no filtering to prevent the harmonics from getting out. This means that there will be a signal on 22.1184, on 44.2368 (the double harmonic), on 66.3552 (the triple harmonic), 88.4736 (the quadruple harmonic), and so on. Because I did not have a crystal that was of a frequency within the NTSC TV channels, I used this harmonic behavior to my advantage. The problem with my circuit is that there is a signal being produced on all harmonics of 22.1184 (although more distant harmonics are weaker). This is usually solved by adding a filtering circuit that filters only the frequency or frequency range you want, and suppresses the harmonics that you don't want.
As for overtones, I have read up on information about this, and if I understand it correctly, then yes, an overtone is another way of referring to harmonic frequencies. And so, a 3rd overtone should be what I have referred to as a triple harmonic.
Mine doesn't
Work ):
This is illegal.
Don't do it.
Stfu its not illegal unless you live in the usa where the fcc makes shitty decisions
Boo huu huu