[HSMM-COS] Red Cross Node
Bill Bishop
hsmm at wrbishop.com
Thu Feb 6 11:00:12 EST 2014
Hi Dan,
Yes, the router in the case will fit, but the feet need to be cut down
a bit. I destroyed one router trying to get the case off -- prying
with a screwdriver gouged the circuit board badly.
The HSMM development yahoo group has a good discussion thread on
"linksys antenna selection options"
One response:
"This question comes up periodically and the answer is "don't change
anything". All multiple antenna hardware designs natively select the
best signal from the best antenna. There is no difference between the
transmit and the receive performance and a "best antenna" decision will
be made for every single signal received.
Where there are two antennas, the mix could be omni + omni, omni +
directional, or directional + directional. In all three cases, you leave
the antenna selection at the default setting. The system electronics
will determine which antenna port works for any given signal from every
location.
We regularly place two highly directional antennas on the same mesh node
and point them in different directions. This is usually the case where
the node is a link between two distant points on the network. Placing a
second node nearby and using omni antennas on it allows it to serve
local users but join the mesh by hearing signals from one of the
directional antennas and then serving users or other mesh nodes nearby.
On some high value buildings, we use two mesh nodes but a link coax
between them. At one corner is a node, directional antenna and a coax to
the other corner. That coax goes into the other node which also has a
directional antenna pointed differently then the first. Even though the
loss in the coax is high, the noise in the coax is almost nothing, still
leaving an acceptable signal/noise ratio and high quality link between
the two corners of the building. This works well when the mounting
position for the two nodes don't allow them to talk directly to each other.
It seems too easy to just leave the antenna selection alone, but it is
actually the correct configuration in nearly every case. These problems
were solved long ago with hardware antenna selector ICs on the circuit
board. If you want to see it, remove the case cover and follow the short
coax from one antenna port to its attachment point on the circuit board.
That IC does the evaluate/select of which port to use."
I hope that helps,
->Bill
On 02/05/2014 08:48 PM, Dan Scott wrote:
> Bill,
> Could you fit the router with case into the panel antenna /w case?
>
> What I want to do is put up 1 omni and 3 directional antennas (2
> routers) on the same tower.
>
> 73,
> Dan
> WØRO
> -----
> http://www.eQSL.cc/Member.cfm?W0RO
>
>
> On Mon, Jan 27, 2014 at 9:06 PM, Bill Bishop <hsmm at wrbishop.com
> <mailto:hsmm at wrbishop.com>> wrote:
>
> Hi Dan,
>
> I bought this omni:
>
> http://www.amazon.com/dp/B000VIA4CA/ref=pe_385040_30332200_pe_309540_26725410_item
>
> and this directional:
>
> http://www.fab-corp.com/product.php?productid=2747&cat=0&page=1
>
> The mesh node is packaged inside the rootenna's "pouch", so the only
> cable running down from the mast is an (outdoor rated) Ethernet cable
> which also carries power. This keeps the antenna cables very short
> (low-loss).
>
> ->Bill
>
>
>
> On 01/27/2014 08:48 PM, Dan Scott wrote:
> > I am in line of site, but need to get moving on my 2 nodes
> again. Any
> > links for good antennas (3 directional and 1 omni)?
> > Dan
> > W0RO
> >
> > 73,
> > Dan
> > WØRO
> > -----
> > http://www.eQSL.cc/Member.cfm?W0RO
> >
> >
> > On Mon, Jan 27, 2014 at 11:02 AM, Bill Bishop <hsmm at wrbishop.com
> <mailto:hsmm at wrbishop.com>
> > <mailto:hsmm at wrbishop.com <mailto:hsmm at wrbishop.com>>> wrote:
> >
> > I believe the headquarters is:
> >
> > 1040 S. 8th Street Colorado Springs, CO, 80905 Phone:
> > 719-632-3563 <tel:719-632-3563> <tel:719-632-3563
> <tel:719-632-3563>>
> >
> >
> https://maps.google.com/maps/ms?msid=212112323330493380573.0004c37a45f447e5bee19&msa=0&hl=en&ie=UTF8&t=m&ll=39.147103,-105.644531&spn=7.239664,11.293945&z=6&source=embed
> >
> > Zoom in and select terrain (under "Traffic" pulldown).
> >
> > Looks like I'm just out of line-of-sight by the terrain view,
> > but that
> > depends on how high the antenna is..
> >
> > Apparently the 3D measuring tools for Google Earth Pro users can
> > do this:
> >
> >
> http://productforums.google.com/forum/#!topic/earth/zCtzHuzOv0E
> <http://productforums.google.com/forum/#%21topic/earth/zCtzHuzOv0E>
> >
> <http://productforums.google.com/forum/#%21topic/earth/zCtzHuzOv0E>
> >
> > Anyone a "Pro" user?
> >
> > ->Bill
> >
> >
> >
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