Why would 3rd TX battery bost range?
 

Just curious...some of you guys have added a 3rd battery in series on the TX and say the range has increased.

Looking at the schematic, I don't see how that is possible, unless somehow more current is getting through to the antenna, but the low-pass filter just prior to the antenna looks pretty limiting to me.

I know next to nothing about electronics, but this weekend I added the AC/DC adapter mod to my car. I elected to use a switchable voltage 800 ma adapter because I eventually want to make the dual battery (in series) mod on the car and I want to be able to charge them both by connecting the charger wires directly to the power.

Anyway, performing several tests with the voltage set a 3V and then at 4.5V, it would appear that I get about 10% more range at 4.5V than I do at 3V. I've tested this in several different rooms several times, and it seems pretty consistent.

I don't know enough to venture an opinion as to why.

think of it like a garden hose. you turn it up say half way and water shoots out say 10fee. you give it another full turn and it goes 15feet.

voltage = pressure

Yup, you are correct sir! Voltage is equal to pressure. When you up the voltage (and the current BTW when adding a third battery) you push a much stronger signal out of your controller. It does work.