[klug] Wireless Linux

[Mark Robinson]

Steve Withers wrote:
> On Thu, 2005-01-27 at 12:07, Mark Robinson wrote:
> Fortunately, the 7Db di-pole antenna is jointed, so I was able to orient
> it vertically.....which, if I understand you right, sees me on the same
> horizontal plane as the directional 10Db antenna....which has a 56
> degree H/V 'coverage'. That one is located at the far end of the house
> and points down the length of the house....and toward the garage beyond
> (via the windows). 

I'm assuming that you are using the XH8136 7dB gain dipole antenna and the XH8137 
10dB gain patch antenna, both from DSE.

The 56 degree refers to the beamwidth of the antenna, usually defined as the 
width where the signal level drops to half that at the centre of the beam.

The DSE datasheet at http://www.dse.co.nz/isroot/dse/support/XH8136_XH8137.pdf 
has radiation pattern diagrams although they are not very clear.

The datasheet also says that the patch antenna is vertically polarised. This will 
depend on which way up you mount it. The only hint is a small drawing which shows 
the connector at the bottom. Mounting it on a vertical surface with the connector 
at the side will give you horizontal polarisation if this assumption is correct, 
and should see your received signal levels in the garage plummet again.

I notice that DSE have the patch antenna at the reduced price of $91 (too much 
for me) until their stocks are exhausted.

regards
Mark

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