[NLRS] 2.4 GHz antenna

[S. Earl Jarosh]

Ford,

One thing to keep in mind is that most cordless phones are on 2.4ghz and
even many 5.8ghz phones have the back channels at 2.4ghz. only some phones
are 5.8 both ways.  Your 802.11b is 2.4ghz and your Dassel connection should
be a 5.8ghz Motorola Canopy system.  Most of the poor signal and LOS
problems with 802.11b are often a result of the cordless phone use in the
house.  If she picks up the phone and has LOS on the laptop well, there you
go.  Everything else is what you already know; RF saturation, antenna gain,
antenna height, etc. No magic here, you have to get the antennas on the
router a more non-obstructed RF view.   I have two 2.4 Maxrad www.maxrad.com
low gain omni antennas going through 10 feet of 9913 on the outside of my
house and can cover easily within 600ft of my house.  I use low gain
antennas because I wanted the better RF saturation levels within the 300ft
circle of my house creating a more intense RF canopy within my defined
service area and the two antennas are needed for the diversity circuit to
work correctly.  This is especially important at these flea power levels and
any directional antenna will confuse the diversity circuit and create very
defined and narrow hot spots.  10 feet of 9913 is still to much but then I
am not intending to service the entire Golden Valley area rather just solid
connectivity on my property.

S. Earl Jarosh (ex. Steve?)
N0HZ  (ex. KA0VYB) No Hertz, No Gain
612-868-1313
earl at jarosh.org

"It may not be the answer you desire but reality seldom equals desire." -- 
Anonymous


----- Original Message ----- 
From: "Ford Peterson" <ford at cmgate.com>
To: <NLRS at mailman.qth.net>
Sent: Thursday, August 04, 2005 10:37 AM
Subject: [NLRS] 2.4 GHz antenna




I've got a problem looking for a solution.  It's my wireless network at the
home QTH.

I get my high speed connection from the top of the water tank in Dassel,
about 3.5 miles from the shack.  I use a 24dBi dish to gather about -60dBm
of signal for the connection.  That one works FB at up to 1.5MB/sec.
Connected to my LAN in the shack is a 802.11G router with dual antennas.  A
simple mag mount collinear on the outside wall provides a local hot spot for
up in the house, some 200' - 220' away.  My XYL uses the link to access the
internet and my LAN in the shack.  The trouble is, her connectivity on the
laptop is poor.  Near a window she gets 2-3 bars of signal (whatever that
means) but loses the connection from time-to-time.

So I'm looking for an antenna design that will provide decent gain at 2.4
GHz, but has a beam width of about 30 degrees.  The 3' - 24dBi dish is too
narrow to illuminate the whole house.  Anybody got any ideas on a good
design?

Ford-N0FP
ford at cmgate.com


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