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RF Transmitter/Receiver Selection - RF Cafe Forums

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noobian
 Post subject: RF Transmitter/Receiver Selection
Posted: Wed Oct 14, 2009 12:20 am 
 
Lieutenant

Joined: Tue Oct 13, 2009 11:45 pm

Posts: 2

Hi there, First of all I applogize if I've posted this in the wrong index.

I'm brand new to the world of RF and I'm attempting a design project I've had in my head for a while now. I'm getting overwhelmed while trying to source/specify the correct receiver/transmitter combo for the job.

This is a household application (not just a garage door opener, need range in the entire house/multi levels). Ridiculously low data rate needed.

What frequency range should I be looking at? What type of modulation scheme is recommended? Are there household frequency ranges?

I'm looking for an "off the shelf", ie. digikey, product that's cheap, SMALL, and user friendly. Something that would work with a small antenna or PCB antenna would be good too. Any suggestions? Or any features I should be considering and have not listed here?

A friend suggested ZigBee but that can be costly.

Basically I have no idea where to begin designing this RF link and would love any bits of info you have to share.


 
   
 
nubbage
 Post subject: Re: RF Transmitter/Receiver Selection
Posted: Wed Oct 21, 2009 4:23 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 343

Location: London UK

Hi

Depending on the complexity of functions you need to control, you might consult Kirt for his vast experience of spread spectrum model control systems. These would normally operate in the ISM band of 2.4GHz. However, I found even these to be far from low in price. Thus a more conventional model control kit might answer the need, operating perhaps in the low power domestic/industrial control segment around 433.5MHz.

But, as I say, a lot depends on the complexity of control functions you need. I am trying to find a low cost system to control a scale model boat, so far without success, so if you come up with a good solution, post it here.

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