The circuit is very simple, it just has three transistors, but the transistor types have been changed for VHF/UHF transistors. You can use 2N2369, BSX19 or BSX20, or any small signal transistor with an “ft” of typically 400MHz or more. The transistor DC biasing is a little more tolerant to varying transistor types than the old V5 (FM)

TR1 is a simple audio transistor, such as the BC547, BC108, or 2N2222. This transistor provides absolutely no gain, but it inverts the video modulation from the camera. Without it the video would have a negative modulation characteristic. The 4K7 pot adjusts the video level and sets the contrast you see on the telly. The 1u0 capacitor in the collector of TR1 to TR2 base can be reversed and moved to TR1 emitter if the modulation is inverted using your camera and TV system. You can alternatively remove TR1: I know nothing of the workings NTSC, or even the French version of PAL, other than the superficial info I shall give you down the page.circuit Tv transmitter very simple

TR2 is the oscillator. Feedback is between collector and emitter, via the 2p7 capacitor. The 10p capacitor is a 2 – 10pf preset capacitor that sets the transmitter frequency. More about that in a minute. Modulation is applied to the base and causes the oscillator to vary in both frequency and amplitude. But this is an amateur hobby construction, not broadcasting standard. Note that in the circuit I connected the 10p cap to the +ve supply rail, but you can connect it to ground, whatever is the most convenient.

TR3 is a buffer stage, but this time it does provide a little gain. Not much, but again its main purpose is to buffer the antenna from the oscillator. In this way the transmitter has a good chance of pretending to be stable :-). The collector of this stage is taken to the antenna through a DC blocking capacitor.

The camera I used was a simple colour CMOS surveilance camera, having a resolution of 628 x 582 pixels, 380 lines. The camera gives out a composite low-res PAL video signal, plus audio, and is powered from the same 9v as the transmitter.

Sound your need is a 5.5MHz (6MHz) varicap- tuned Colpits oscillator, fed into the emitter of TR1 through a 10pf fixed capacitor. My oscillator was a Marconi 995 signal generator and shack  warmer, but that is not quite so portable!

There are three analogue TV systems in use today, and these are NTSC, PAL and SECAM. NTSC was the first TV system to see commercial use, but the PAL/SECAM system gives an improved performance, both in picture resolution and in the contrast possible.