Need help with a TV transmitter project.

[elby_lk]

hai everybody..i'm indonesian.i need some help to make a tv TX.but i dont have a schematic this one.i need like a tv Tx with PLL design and i thinks this more stable than not use PLL.thanks

 

[shahrukh1]

Hi,Dazza,
I am new here.Wanted to know whether that circuit worked or not.Just planning to make something like that.Thought it might be a good project. Tell me what happened about that.Thanx 

 

[Dazza]

Hi, shahrukh 

Sorry for the late reply, the TV transmitter is still an unfinished project, I couldn't get the right RF transformer (T1) so I could not get the sound to come through .

I did manage to get it to transmit a very good quality colour picture over a short distance, however I was transmitting to a very old portable TV, and when transmitting to a more modern TV the image was not very good.

Regards Dazza.

 

[shahrukh1]

It's ok Dazza.I thought that RF transformer is not a problem.As,Mr. Audioguru said that any IF transformer from a TV would work.Can u tell me what specifications are required for it.You said the image wasn't good.So,what do u think so about that.Is the circuit wrong somewhere or ...?

 

[audioguru2]

I think the circuit is too simple for a good picture. A real TV transmitter uses a complex wideband video amp and RF tuning that is wide and flat for one sideband. The sound in this project spec's a 4.5MHz transformer used in United States TVs. Other parts of the world use a 5.5MHz transformer.

 

[cedeal]

hi,
  the project is so good,i like it

 

[shahrukh1]

hi Audioguru,
Is this tv transmitter not going to give me a reasonable picture and what about sound.Dazza hasn't got any sound?why?....5.5MHz RF transformer ...Is this enough specification to buy it?

Cead

hi,
the project is so good,i like it

Cedeal,what do u mean?have u made it?

 

[Kasamiko]

Does somebody has a good PCB layout for this?

 

[audioguru2]

hi Audioguru,
Is this tv transmitter not going to give me a reasonable picture and what about sound. Dazza hasn't got any sound? why?....5.5MHz RF transformer ...Is this enough specification to buy it?

Build it and try it. It doesn't have anywhere near the number of parts as a real TV transmitter. I don't think its picture and sound will be clear.
The IF transformer must have a frequency to match what TVs use in your part of the world. Some transformers have tuning capacitors built-in, others need external capacitors.

 

[rovnex]

hi im a newbie here and i was amazed of the simplicity of both circuit from Poptronix and Ramsey design. have you tried Ramsey? im buiilding Poptronix and having difficulty of some of the items.
is 4.5 mhz IF Transformer suitable here in the Phillipines? can somebody teach me how to wind my own .15uH coil and 2.2uH miniature inductor coil.