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AM sender

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ua741

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I am working on a garage door opener( remote controller) .

I am using AM sender and receiver. The carrier freq. is 455 KHZ .

Before antenna I used a power amplifier ( push pull , with transistor BD 135, BD136)

There is an oscillator in sender , too.

When I connect oscillator to AM sender the amplitude decreases. The out put of oscillator is 2 volts but as I connect it to AM sender it will be 0.5 volts. And when I connect these two parts to amplifier, again we have a decrease in amplitude and there is a noise in the output of amplifier.

How I can eliminate the noise and achieve to a fixed output?

By the way , I have limitation on the size of sender.

Thank you , Vahid KH
 
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