[OpenTRV-dev] EU radio band 48

[Kevin Wood]

Actually.. The chip in the RFM23 module has registers to select the 433
and 915 MHz bands, suggesting that it's probably only the passive
components on the RFM module that are band specific. An 868 MHz module
might even work at 915 MHz with reduced power output &/or sensitivity.

Anyway.. Within europe, if we're going to ship it as a finished product,
there needs to be a CE declaration backed up by some testing. That would
be true whether or not it incorporated a radio transmitter in my view.

Kevin

> or sign up a chinese culi.... we dont have to pay them :-D
>
> joke aside... my thought was to use a freq that could be used both places
>
> if not possible then a module that comes in the freq's we need and get a
> few shipped without the module and solder the us one is ourselves
>
>
>
> 2016-06-08 15:42 GMT+02:00 Kevin Wood <kevin at the-wood-family.com>:
>
>> 433MHz is only an ITU region 1 (basically EMEA) band, I believe.
>>
>> There isn't one in the "hundreds of MHz" that exists both in UK/Europe
>> and
>> US. Not until you get up to 2.4 GHZ, then you're competing with wireless
>> LAN, video senders, etc.
>>
>> There is an RFM module for 915 MHz, so, if the will was there, something
>> could be done for the US with the change of one component and maybe a
>> change to the programming of the frequency registers in the RFM.
>>
>> Kevin
>>
>> > 433 should be the "universal" one
>> >
>> > 2016-06-08 15:12 GMT+02:00 Kevin Wood <kevin at the-wood-family.com>:
>> >
>> >> > btw... how are freq set on these things?
>> >>
>> >> By programming registers on the RFMxx module, and they have a range
>> (on
>> >> paper) of around +/-20 MHz so small changes in frequency can be
>> >> accommodated in code for regional variations. Larger shifts in
>> frequency
>> >> (i.e. to the US ISM band) can't, without getting a different module.
>> >>
>> >> Kevin
>> >>
>> >> > maybe we could just program them depending on where they go?
>> >> >
>> >> > there are 3 main options and i think one of them is us only and the
>> >> other
>> >> > europe only and the last one goes both places
>> >> >
>> >> > 2016-06-08 13:58 GMT+02:00 Damon Hart-Davis <dhd at exnet.com>:
>> >> >
>> >> >>
>> >> >> > On 8 Jun 2016, at 12:56, Joseph Heenan <joseph at heenan.me.uk>
>> wrote:
>> >> >> >
>> >> >> > I believe there is a version of the RFM23B with a 0.1" header
>> >> fitted.
>> >> >>
>> >> >> 2mm pitch IIRC, bah!, so I was never able to use the one I bought!
>> >> %-P
>> >> >>
>> >> >> Rgds
>> >> >>
>> >> >> Damon
>> >> >>
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>> >>
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