Hi Russell.

Just to let you know, I received Harold's original post at 4:18pm (U.S. 
eastern time) on 8 July. It had the subject line:
"[EE] Use of Zigbee modules for one way link?"

It's all magic, yes?

Richard

----- Original Message ----- 
From: "RussellMc" <apptechnz@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, July 09, 2010 8:10 AM
Subject: [EE]:: Wanted - one way RF link with FCC certification


> Reposting Harold's post with tag and subject line.
> Bad day or bad email client ? :-).
>
> _____________
>
> ---------- Forwarded message ----------
> From: Harold Hallikainen <harold@hallikainen.org>
> Date: 9 July 2010 08:42
> Subject:
> To: Pic List <piclist@mit.edu>
>
>
> 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?
>
> THANKS!
>
>
> Harold
>
>
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