[MLB-WIRELESS] Success with GHO

[Peter Buncle]

Hi Peter,

My link is back up to GHO

So you can get to http://10.10.131.1 now which has a 
list of active nodes on it.

I'm not convinced I've completely fixed my issue
but it's running for now.

FYI

I've now changed over my uplink to ILE

It's now on 802.11a (5Ghz) and achieving 1 - 1.5 mbytes per sec.

Cheers

Peter



-----Original Message-----
From: melbwireless-bounces at wireless.org.au
[mailto:melbwireless-bounces at wireless.org.au] On Behalf Of Peter Berrett
Sent: Sunday, 30 September 2007 3:28 PM
Cc: melbwireless at wireless.org.au
Subject: [MLB-WIRELESS] Success with GHO

Hi all

I have modified the 24db Galaxy dish I purchased off Peter B. and
created a new dipole to drive the antenna. I compared it to my cantenna
(estimated gain 12 db) and there is definently an improvement of 8-10 db
over the cantenna.

One interesting discovery was the polarisation of the feed.  The
reflector is like a series of copper pieces each about 1.5 cm wide with
a similarly sized gap between each. These gaps are quite long (>10 cm). 
Initially I polarised the feed perpendicular to the copper strips  but
the results were disappointing. When however I polarised the feed
parrallel to the strips the results were significantly improved. Thsi
seems counter-intuitive to me.  I suspect that if I was to put some
aluminium fly screen over the gaps berween the strips I would get even
more gain. Because the gaps exceed 1/10 of a wavelength it probably is
not a perfect faraday cage.

I had no problem logging in to GHO although I noted that several nodes I
had bookmarked on my laptop were unavailable.  This may be due to the
cloud that has been hanging around Mt Dandenong affecting some of the
links?

I shall try and see if I can get through to FUT today with the Galaxy
Antenna from my location (JXG) . It would be tempting to go up to Mr
Dandenong and see what kind of range one can get with an antenna like
this.

cheers Peter
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