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In this instuctable, I will show you how to make a cheap analog tv transmitter for channels 3-4.

Disclaimer:    I am not responsible for ANY damage or an laws broken. REMEMBER, talk to local officials about any transmissions you plan to make because in some states, THIS IS ILEGAL, so be warned.  



Anyway, if you succesfully complete theses easy steps, you could get a transmission radius of 5 miles easy. There is one problem, you need to have some knowledge about antenna lengths and tuning them. Other than that you are good to go! ;) 
 

Step 1: Materials:

This is what you need:

1.   one RCA to TV RF Modulator- you can get it at any superstore like wal-mart or at  Radio Shack (even at most Doller Generals)
       B. Most mid-90's vcr players of a tv rf module, but you have to unsolder it after ripping apert the case.
2.         RF TV cable with type-F connecters.

3.         One power strip- can get it anywhere cheap.


4.         Any vhf tv signal amplifiers you can get your hands on. For short range transmission, I recomend at least two amps.

5. You need one aditional tv amp but this one absolutely needs a Gain control. It is Essential you get one of these because your tv transmitter will not work. Radio Shack does carry these but they can get pricey. Try wal-mart first, or online.

6.  You need an 75ohm to 300ohm converter with a copper wire attached as an antenna.

7.  Finally, you need a video source-in this case it is a jazz digital camcorder- and a means of connecting your video source into the rca modulator.


Now that you have collected all of these components, it is time to assemble your transmitter.  

Step 2: Assemble...

Now that every component is gathered, You first take the TV modulator and plug it in into your video source. Then you plug all of your amps and the modulator into your power strip.
Next, you take one of your tv rf cables you plug one end into the rf socket that says "tv out". The other end of that cable connects into the "in" socket of the amp with the variable gain. After that, you daisy chain all of the other amps onto the first amp with gain control. At the last amp attatch your antenna, just make sure it i tuned. That's it!!

Here is a picture of the one I made, it should give you an idea of how to rig this up... 

Step 3: The Show

To Operate the Transmitter, you video source into the modulator. Some modulators turn on when it senses a video signal but others have a switch. Anyway, after that you choose either channel 3 or 4, attatch your antenna, then turn your tv on two channel 3 or 4 and ajust your gain control to view your video over the airwaves.  



Here is the transmitter in operation.!!!
how much electricity does this use <br>
This is funny-I built one based on my previous experiments and it is baisically the same as yours although I never saw this before. The only difference is that mine is portable and it looks like one of those gadgets from spy movies.
Please can someone give me links to the things I need from amazon or ebay
<p>I&rsquo;m working on a project which is about making a rescue <br>robot . I have struggling with it for 4 months and now all the mechanical works <br>had been done . but I&rsquo;m facing difficulty in make the robot to work with rf <br>module can u plzz help me&hellip;</p><p>I want make transmitter and receiver that can control the <br>motion&hellip;I mean that receiver should have control 8 dc gear motor and each dc <br>motor should have a forward and backward botton to control the motion &hellip;&hellip;can u <br>kindly help me with this project &hellip;.if u can make the circuit board diagram for <br>the PCB &hellip;.or any other suggestion plz reply&hellip;&hellip;mail me at &ldquo;sunny1995gagan@gmail.com&rdquo;</p>
<p>what you are asking for is a 16 channel radio transmitter and receiver. I hate to say this but it would be better just to buy it..... analog wise its way too difficult and expensive and as for digital control, well it would be easier that way but then you would still need to build the rf equipment yourself= difficult. that is why I am saying to just buy the equipment. Look for model aircraft controls, the transmitter and receiver module only, specifically secondhand equipment, they can be had for cheap and still be working.</p>
I did what u said but it only goes about 10 to 20 feet Help
the way i did it is not perfect, shoot it is about the most ineffective way but it does the job. <br>also if you used rabit ears then ya ur range will suck. try a cb antenna solid core or better yet a scanner antenna that can be tuned. and if your not looking for 360 coverage, than use a directional antenna. <br>
my disclaimer is there for a reason. use discretion and care.........also of the broadcast is within 300 feet of source transmit, it is legal except where it is causing people to complain. means don't broadcast porn in a area where children are heavily present. that WILL GET YOU into trouble. same goes for fm/am broadcasts.
i think its worth noting that this may be illegal to do, as channel 3/4 i think are not in the unlicensed bands, and you do have the potential to interrupt your neighbors ability to watch anything broadcast on those channels. This is less important with digital broadcasting, or rich neighbors with cable
Do it again with your bed spread turned back and on your white sheets. Too much going on in the background with Granny's quilt! :)
Light and shadow master, <br> <br>It depends on how many amps you use. Each amp uses about 10W of electricity. <br>

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