Long Range Remote Control (The problem of many People)

[Shahriar]

Hi
I Need a Long range remote control about 600 or 700 meters. No range Limit is in my area.I have some modules For those garage doors remotes. but their range is not enough,
I made a try to make it by using that 4Watt FM Transmitter in project section but the frequency Of the ocillators sometimes changes and because I want to use it for a customer, I am not very sure about it. (Long range Remotes is  a main problem for many people)
I am curious to know why those garage door frequency never changes?
Any schematic or advice for increasing the range of those garage remotes is appreciated in advance.

P.S. That 4watt FM Tx in project section works very well and I sent an audio from my PC sound card with very High quality and it has very long range.

Shahriar

 

[privas]

I have the same problem. Have you come up with a solution?

 

[Shahriar]

No, Building a good one for customers is impossible for me!

I bought one which was made in Taiwan with a SAW filter and lots of SMD Components!

HTH  - Shahriar

 

[privas]

There is no antenna coming out of the remote. You can get a good picture of the remote control that I"m using if you follow the link that I posted. Would adding a frequency amplifier be an option and if so, how would I add it to the remote?

 

[privas]

Sorry about the last comment, I replied to the wrong thread