On 23 Jan, 03:31, "ps56k" <pschuman_no_spam...@interserv.com> wrote:
> Staring down at my WAP54G sitting on the floor with it's 2 antennas,
> I was wondering about the pattern...
>
> Is it using diversity - ping pong - so that both are not on at the same
> time,
Correct.
> for either xmit/rcv ?
Correct.
> ie - each has it's own donut, and they both are not active at the same exact
> time
Correct.
> therefore there is no addition/subtraction to the pattern....
Correct.
> circle oval -
More like circle circle if the antenna is a 1/4 L, which most antennas
of this type are.
> SO - if it's upstairs, in a front bedroom,
> then the donuts are equal and horizontal in plane....
Correct.
> What if we tilt the antennas, so the donut touches more of downstairs ?
That's a good thing if you like better field strength downstairs. Just
remember to adjust the antenna(s) downstairs so that their donuts
points at eachother, so that they are alined for polarization.
> And - thinking out loud - what about orientation vs the wall
> The 2 antenna's along the wall - donuts going left & right along house
> vs perpendicular to the wall ?
Clients that stands perpendicular to the donut so that the antenna phy
element is pointing directly to the client upstairs, that client will
suffer from such an orientation. This is a truth with modifications
because field pattern indoor when it comes to the dark side of the the
pattern is overthrown by reflections. The important thing is to make
sure your polarisation is alined. Outdoor (without reflections from
walls), if an omni antenna got vertical polarisation (antenna is
horizontal) with it's phy tip pointing to a client, and this client
got a horizontal polarization with phy element tip pointing up, you
got the worst case possible with a theoretically loss of 80dB. If one
is pointing horizontal and one is pointing vertical, but both are in
the same pane, the theoretically loss is 20dB. This is not something
you will measure indoors, and thats why it's very hard to give you any
reasonable advice how you should point your antennas other than they
all must be polaralized as close as possible to be in the same pane,
regardless of reflections, if you want to get the most field strength
you can.
> hmmm - gonna have to walk around (site survey) tomorrow with Netstumbler
> and see if the orientation or tilting makes any differences in the actual
> coverage.
I bet you could see a difference of at least 10dB.
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