--------------------------------------------------
From: "Harold Hallikainen" <harold@hallikainen.org>
Sent: Thursday, July 08, 2010 9:42 PM
To: "Pic List" <piclist@mit.edu>
Subject: [EE] Use of Zigbee modules for one way link?

>
> I need a one way RF link. I'm considering use of 915MHz, but I can not
> find any transmitters with FCC modular transmitter certifications
> (http://louise.hallikainen.org/FCC/FccRules/2010/15/212/ ).
>
> Section 3.1 of http://ww1.microchip.com/downloads/en/DeviceDoc/70329b.pdf
> states that the MRF24J40MA has certification as a modular transmitter.
>
> I COULD go Zigbee all the way, except that the "receivers" would generally
> need to transmit back to the "transmitter" where the data originates.
> Section 3.1.1 of the datasheet requires the antenna be 20cm or more away
> from people. This disallows a handheld or portable "receiver."
>
> So, what about the possibility of operating one MRF24J40MA as a
> transmitter and multiple MRF24J40MA modules as receivers where the
> receivers NEVER transmit? Has anyone tried anything like this? Is it a
> good or bad idea?

Is this any good? It's one of the modules I ordered for the Radio Lights I 
mentioned a while back. Cheap, says it's FCC compliant and can be run at 
915MHz. What data rate do you need?

http://docs-europe.origin.electrocomponents.com/webdocs/0d71/0900766b80d715d0.pdf

 


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