315mhz RF Transmitter, Boosting power?

Projects Networking, Protocols, and Devices
1

Hello, I am a complete n00b when it comes to RF transmitter circuits. I have a few of those cheap 315mhz transmitters and receivers. I am just curious to know if there is a way to boost the range. The transmitters are so cheap I don't mind experimenting with them, so there are two things I thought of trying, but I don't know if it will work.

The first way would be to wire two or more transmitter data pins in series. Let's say one of them transmits at 10 milliamps (it's probably not even that much), If I share the data pin between two of them so they transmit the same data at the same time that would essentially boost the power to 20ma. BUT I don't see this being able to extend the range past where a single transmitter would reach, it would only provide more transmitting power in the same range, and I'm guessing that if each transmitter is not perfectly tuned to the next one, it would create some fuzz on the signal.

The second way would be to share the same antenna from two transmitters? but I'm sure this will cause a lot of internal problems in the transmitters. But if it's possible, would it work with 2, 4, 6, 8+ transmitters? pretending that broadcasting at a signal this strength is legal of course.

Other than that, is there a simple way besides the obvious messing with antenna's that would allow me to broadcast the signal at a slightly higher strength?

I'm more curious than anything.

Thanks.

2

Working at those sorts of frequencies requires specilist test equipment and knowlage. There is nothing much that you can practally do.
Sorry but those ideas would not work. Two transmitters would have to be synchronised and that needs special circuitry.

Playing with the antenna would workout you need expensive test gear and would void any regulatory approval you have. In nearly all countries you are not permitted to make your own transmitter even for use on a licence free band.

The only thing you could do is to increase the voltage you drive it at. Look at the spec and drive it at the maximum voltage no more.

3

Grumpy_Mike:
Working at those sorts of frequencies requires specilist test equipment and knowlage. There is nothing much that you can practally do.
Sorry but those ideas would not work. Two transmitters would have to be synchronised and that needs special circuitry.

Playing with the antenna would workout you need expensive test gear and would void any regulatory approval you have. In nearly all countries you are not permitted to make your own transmitter even for use on a licence free band.

The only thing you could do is to increase the voltage you drive it at. Look at the spec and drive it at the maximum voltage no more.

That makes sense, thanks for the reply.