[OpenTRV-dev] EU radio band 48

[Damon Hart-Davis]

We just don’t have time to add features, support very minority customer segments, etc.  Not this time.

If we have to use a new radio for CE purposes that will nearly kill us anyway.  We might have to do this one without a radio entirely for example.

This is meant to be a lightweight non-costly effort, not bet-the-ranch!  We don't have a pile of cash burning a hole in our pockets.

(Not that you knew any of that context from my head, but now you do!)

Rgds

Damon


> On 8 Jun 2016, at 14:47, Bo Herrmannsen <bo.herrmannsen at gmail.com> wrote:
> 
> 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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