Jeff Liebermann <(E-Mail Removed)> wrote:
> On Tue, 23 Aug 2011 05:58:36 -0500, "NotMe" <(E-Mail Removed)> wrote:
>
>> Years ago we had a cell system client that was complaining a new hand set
>> did not work in the CEO's car. Everyone tried to tech to problem over the
>> phone.
>>
>> Turned out the windows were metalize and every time the window was rolled up
>> or the door closed the call would drop.
>>
>> Nothing like on site observations to show the real problem.
>
> The local university built several new buildings and extended their
> micro-cellular system to the roof tops. However, since the windows
> were all coated with Low-E material, cell phones inside the building
> would not work reliably.
>
> Some detail on Low-E coatings:
> <http://802.11junk.com/jeffl/crud/Low-E-titanium-nitide-glass.pdf>
> There's not much on RF characteristics in the report except for the
> graph at Fig 4, which shows how titanium nitride passes visible
> wavelengths (370-750nm), and blocks lower frequencies. 2.4GHz (125mm)
> is far off the graph towards the right. With 35 ohms/square it's as
> good as a dead short to RF.
>
I often wonder about using gps in cars.
I bought some cheap coax 8 foot long. Probably has at least 8 dB loss! Too
lossy but it fits in the gap between double hung windows. I want to get
some better wire no more than 4 foot. I found a company that has good
prices. I have to see what size the coax is.
Greg
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