All,

 It seems to me, and correct me if I'm wrong, but it has always been my 
 understanding that in the FCC rules, it states that virtually anyone can
 transmit on almost any frequency provided that....

 1).  The input to the transmitter final RF Amp stage does not exceed 100
      milliwatt.

 2).  The antenna used does not excced 1 meter in length


 3).  No harmful interference is cause to FCC approved equipment.


 And from the sound of the description of the application described here, 
 it would fall under this umbrella.  Unless the FCC rules have changed 
 regarding this, you should be okay.  Be aware that I am not giving legal 
 advice here.   Just an idea for thought and research from an old amateur
 radio operator that seems to remember somethign to this effect.  It's up
 to you to find the actual FCC regulation and interpret it.


                                            Regards,

                                              Jim  (KA9QHR)





> Harold,
> 
> On 12/03/07, Harold Hallikainen <harold@hallikainen.org> wrote:
>> I have an application where I need an extremely cheap RF transceiver
>> that talks to a more expensive one. I'm thinking someone might make an
>> RFID tag with a serial port that could be connected to a PIC. An RFID
>> reader would have an EIA232 port on it that could be connected to a
>> host computer. The host would poll the tag which would respond (half
>> duplex). Anyone know of an RFID tag with a serial port?
>>
>> THANKS!
>>
>> Harold
>>
>>
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> 
> 
> What sort of range & data rate - if you could do it optically then you
> would avoid the FCC requirements everyone is commenting on.
> 
> Of course, if you are not in the USA then this _may_ not matter,
> depending on local regulations. But if the range is short enough not to
> be likely to cause a problem with other spectrum users then optical may
> work out cheaper & easier anyway.
> 
> Or ultrasonic or ......
> 
> Can you put a maximum cost on it ?
> Is incoming interference likely to be an issue? How reliable does the
> link need to be?
> 
> For a more elaborate setup, Nordic do an RF tranceiver with built-in
> 8051 micro with versions that operate at 433MHz, 900 odd MHz and
> 2.4GHz. B They are cheap for what they do but may not be cheap enough
> for what you want them to do. There are also manufacturers making
> modules using these chips that might meet your requirements, but again
> at a cost penalty.
> 
> (I looked at using them in place of optos where I needed a 15mm
> isolation barrier and they came in competitive. Then I realised that
> the system would be even more useful if I used them as proper
> tranceivers mounted at the sensors, then we had to look at Zigbee
> instead, as we are a member, and then the project was canned anyway.
> Maybe one day!)
> 
> RP
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