Germain,

 Just an observation on my part and a bit of a tangent from your
 original question, but regarding the RF power output of your unit.
 You state that you are allowed a mx of +10dbm which is 10mw, correct?
 And that you'd be happy to get 0dbm, which is 1mw correct?  And that
 this could be had with only 100mw input.  Is this input to the entire
 unit, or only to the RF section?  If to the whole unit, then what
 portion of this input goes to the RF section?   If this is to the RF
 section only, then you must have a very ineffecient RF section to be
 sure.  It seems to me that even the most ineffecient transmitter RF
 power output driver/amplifier can convert at a reat of 30% or so.
 At best, you are getting about 10% and at worst about 1%.  Is this
 correct, or am I miscalculating the numbers here?  Please advise.

                                               Regards,

                                                 Jim





On Thu, 11 January 2001, Germain Morbe wrote:

>
> Jinx,
>
> we buy a seiko ldo that do 100mA, it is about 0,23$ at 10k pcs.
> Its not that cheap but its main drawback is its poor availability over time.
> Once you have decided for such a part you often cannot change on the fly,
> especially at higher volumes.
> That is why our company would love to use no specialized parts at all which
> is often not a technical but a vital decision. I myself prefer state of the
> art components when needed.
>
> In generally i agree to you labour cost arguments, only because its all
> surface mount, labour cost is not that high.
>
> The battery is a small 23A type, usually its voltage not much higher than
> 12V.
>
> We are allowed to radiate up to +10 dBm at 433MHz here in europe, but
> usually with a poor antenna you will be happy to reach 0dBm if you put 100mW
> in.
>
> For the moment i tend to the ldo approach also. Who is building the LP2951?
>
> Germain
>
> --
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jim@jpes.com

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