RF22 operating frequency

[Lunchmaker]

I'm new at Arduino, programming and wireless but MikeM's fantastic work on the libraries has helped me to understand alot of what's going on.  I wanted to ask about the init process in the test, server and client examples.  I bought my RF22's from D6Labs  http://www.d6labs.com/ (where you always will get the 1000 pc price for any quantity).  When I bought the tranceivers I had to specify 434MHz, 868MHz, or 912MHZ and they came with the markings showing the frequency of each.  The init process appears to program the transceivers to 434MHz.  Are the modules optimized in some way for the frequencies I purchased them for or is this a non-issue? My 868MHz tranceivers communicate using  the client/server examples with no apparent problems. I made a circuit board for the modules but  I have not installed a module of a different frequency onto a PC board so I'm not sure if that will create a problem but it appears that the init reprograms the tranceiver for a different frequency since the init never fails.   Again, as a newbie I am very grateful for the great forum material, willingness to share solutions and Mikes wonderful library work. Thanks alot for making this available!

[Mike McCauley]

Hello,

I have a SparkFun RFM22 Shield
https://www.sparkfun.com/products/11018

The web page says 433MHz ISM band, but later it says:
Frequency Range = Software configurable from ~240MHz to 980MHz

Its frequency can certainly be set from 240 to 900 MHz and it radiates on the
selected frequency. You need the right length antenna for the frequency to get
any significant power out.

As for the RFM22-S2 RF Transceiver Breakout Board
https://www.sparkfun.com/products/9821
the spec sheet says only
Frequency Range = 434 MHz
although it seems to have the same RF22 chip?

I havent tested one of those. Anyone else?

Cheers.

On Friday, October 12, 2012 12:11:25 PM Lunchmaker wrote:
> I'm new at Arduino, programming and wireless but MikeM's fantastic work on
> the libraries has helped me to understand alot of what's going on. I
> wanted to ask about the init process in the test, server and client
> examples. I bought my RF22's from D6Labs

> *http://www.d6labs.com/*<http://www.d6labs.com/> (where you always will get

> the 1000 pc price for any quantity). When I bought the tranceivers I had
> to specify 434MHz, 868MHz, or 912MHZ and they came with the markings
> showing the frequency of each. The init process appears to program the
> transceivers to 434MHz. Are the modules optimized in some way for the
> frequencies I purchased them for or is this a non-issue? My 868MHz
> tranceivers communicate using the client/server examples with no apparent
> problems. I made a circuit board for the modules but I have not installed
> a module of a different frequency onto a PC board so I'm not sure if that
> will create a problem but it appears that the init reprograms the
> tranceiver for a different frequency since the init never fails. Again,
> as a newbie I am very grateful for the great forum material, willingness to
> share solutions and Mikes wonderful library work. Thanks alot for making
> this available!

--
Mike McCauley mi...@open.com.au
Open System Consultants Pty. Ltd
9 Bulbul Place Currumbin Waters QLD 4223 Australia http://www.open.com.au
Phone +61 7 5598-7474 Fax +61 7 5598-7070

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[Alex Rau]

I read that the chip does all the bands but the circuits contain band filters which limit the range specifically to one single band.

Alex

[Desai Ravi]

I have 4 arduino board and 4 rf22's module. i want communication between two different pair in same area. how to do this type of communication. problem is data interference. can i change rf22 module frequency???

[Mike McCauley]

Hello,

If you read the documentation, you will see that this project is obsolete and
has been replaced by RadioHead:

http://www.airspayce.com/mikem/arduino/RadioHead/

--
Mike McCauley VK4AMM mi...@airspayce.com
Airspayce Pty Ltd 9 Bulbul Place Currumbin Waters QLD 4223 Australia
http://www.airspayce.com
Phone +61 7 5598-7474