Re: RF white paper

[nobody@xxxxxxxxxxxx (Dave Houston)]

The URL for the Ohio State study is defunct but here is another rather
detailed paper on the topic RF propagation indoors.

     http://sss-mag.com/indoor.html#tutorial

nobody@xxxxxxxxxxxx (Dave Houston) wrote:

>I believe they gave the figures for free space and stated that the 25dB
>figure was for the typical indoor environment. There were studies done at
>Ohio State which gave much the same averages.
>
>I doubt that Echelon would enthuse other PLC technologies but, aside from
>being "field tested", I think their conclusions probably apply to Insteon
>and UPB.
>
>"RF Dude" <post@xxxxxxxxxxxxxxxxx> wrote:
>
>>The 25dB attenuation value may be true for certain types of walls or
>>materials, but should not be attached to distance (which could be free
>>space).
>>
>>I recall one site I tested where the plate glass doors in some underground
>>mall entrances were worth 25 dB of attenuation.  When the doors were open,
>>900 MHz signals would pass and cellular service worked on the other side.
>>As the doors closed, the calls would drop.
>>
>>The white paper does outline the difficulties with RF in a chaotic,
>>uncontrolled (unlicensed) environment.  Their symptoms described are
>>important to many unlicensed bands.  Do you really want to have Bluetooth
>>and WiFi in the same house at the same time?  Buyer beware.
>>
>>I wonder if their optimism for Echelon would hold true for other PL
>>technologies... like Insteon... etc.
>>
>>RF Dude
>>