Reducing RF power of video transmitter

[fizz_it]

It does strike me that the best solution to your problem might be to use a very low power RF signal source in the first place. For instance, you could do away with the final RF amplification stage of the unit. It's a waste to generate the power then to dissipate it inside the box!

I second that. Your batteries would last longer as well. If there is an external amp in the circuit, typically there is a resistor that is tied to the output of amp. This is a current limiter that sets the output power. It should have a value from 1 to 300ish ohms. Replace that one with one that is slightly higher and see if the transmission distance drops.

As for ferrites
http://mouser.com/search/ProductDetail.aspx?qs=uSeJpk%2f8In1VmERn9ukNjA%3d%3d

those are rated for 2.4 GHz operation
Murata has information about their ferrites here
http://www2.units.it/carrato/didatt/el_appl_2/doc/filters/murata_sf.pdf

You can read about which ones are suited for use @ 2.4GHz

 

[larsbentley]

This is a current limiter that sets the output power. It should have a value from 1 to 300ish ohms. Replace that one with one that is slightly higher and see if the transmission distance drops.

I'll look into it and see if I can identify it. The transmitter I'm using is a tiny little circuit board 1/2" x 1/2" and covered with some heat shrink plastic that looks to be epoxied at the ends, so its going to be a pain to even uncover the board. Thanks for the tip on those ferrites...ordered some.

Lars

 

[ravioli]

Since it appears that you are looking to make this into a business, let me give some advice. Get the expertise to get the job done right. Contract out. You will save time(and money) for yourself, and come out with a device that performs better.