AM transmitter and reciever

[niranjay_r]

I rigged up a circuit for AM modulation and demodulation. They work fine, when i connect then together with a wire. I want to make the whole setup wireless, ie, I want to transmitt the AM signal. An I dont want any heterodyning.

This is how my circuit now looks:

[Signal inputs]---[AM modulator]---[AM demodulator]--output

I want this:
[Signal_inputs]--[AM_modulator]--[???]...air...[???]---[AM_demodulator]--output

How do I do that? I want to achieve only a modest transmission range, say 1 or 2 meters. My carrier is also of pretty low frequency. Say 200KHz.

I understand to boost the range I need an amplifier of some sort. Are there any standard RF amplifier ICs available like the LM380/387 for audio range.

Thanks.

 

[McGuinn]

Sorry, it seems that hetrodyne is an AM basic...
You have to modulate the signal to a higher frequency to be able to transmit...

**broken link removed**

http://scitoys.com/scitoys/scitoys/radio/am_transmitter.html

 

[Russlk]

You can buy 433 mHz transmitters and receiver for about $10 each. Do a Google search.

 

[Staigen]

Hi. The only things thats missing here is the antennas!
-----------------
I want this:
[Signal_inputs]--[AM_modulator]--[???].....air....[???]---[AM_demodulator]--output
_______________________Here^^^and here^^^

//Staigen

 

[Russlk]

You can buy 433 mHz surface mount antenna from Mouser. www.mouser.com.