slot design

Any one got information as I need to shoot a link about 600 metres and
am thinking a home made slot would be the ticket . (and ues its los if I
go up 10 metres whixh means 15 metres of coax all up)

On Fri, 04 Mar 2005 15:40:12 +1000, atec <"atec77(atec)"@hotmail.com>
wrote:

>Any one got information as I need to shoot a link about 600 metres and
>am thinking a home made slot would be the ticket . (and ues its los if I
>go up 10 metres whixh means 15 metres of coax all up)

I'll assume 2.4GHz. 4 slot antenna:

http://www.austwireless.com/catalog/...roducts_id/195
Only $365/ea.

Wanna disclose what you're trying to accomplish, what you have to work
with, and why you think a horizontally polarized slot antenna, which
is normally used as a sector antenna, is the "ticket"?


--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# (E-Mail Removed)
# (E-Mail Removed) AE6KS

Jeff Liebermann wrote:
> On Fri, 04 Mar 2005 15:40:12 +1000, atec <"atec77(atec)"@hotmail.com>
> wrote:
>
>
>>Any one got information as I need to shoot a link about 600 metres and
>>am thinking a home made slot would be the ticket . (and ues its los if I
>>go up 10 metres whixh means 15 metres of coax all up)
>
>
> I'll assume 2.4GHz. 4 slot antenna:
>
> http://www.austwireless.com/catalog/...roducts_id/195
> Only $365/ea.
>
> Wanna disclose what you're trying to accomplish, what you have to work
> with, and why you think a horizontally polarized slot antenna, which
> is normally used as a sector antenna, is the "ticket"?


no I don't , I do know its the way to go , for my purposes.
nice link but Ill have to find more as I said I intend making one or
two of then , now why you assume its horizontal in polarisation ?
>
>

On Fri, 04 Mar 2005 16:16:35 +1000, atec <"atec77(atec)"@hotmail.com>
wrote:

>Jeff Liebermann wrote:
>> On Fri, 04 Mar 2005 15:40:12 +1000, atec <"atec77(atec)"@hotmail.com>
>> wrote:
>>
>>
>>>Any one got information as I need to shoot a link about 600 metres and
>>>am thinking a home made slot would be the ticket . (and ues its los if I
>>>go up 10 metres whixh means 15 metres of coax all up)
>>
>>
>> I'll assume 2.4GHz. 4 slot antenna:
>>
>> http://www.austwireless.com/catalog/...roducts_id/195
>> Only $365/ea.
>>
>> Wanna disclose what you're trying to accomplish, what you have to work
>> with, and why you think a horizontally polarized slot antenna, which
>> is normally used as a sector antenna, is the "ticket"?

> no I don't , I do know its the way to go , for my purposes.
> nice link but Ill have to find more as I said I intend making one or
>two of then , now why you assume its horizontal in polarisation ?

I assumed horizontal polarization because vertically mounted slot
antennas are almost always horizontally polarized. That's because you
can build a vertically polarized sector antenna, with similar
characteristics, much easier and cheaper using a vertical colinear.

It is possible to design a vertically polarized slot antenna, but the
geometry and pattern are rather odd looking. These were used for
early WWII era aircraft night-fighter RADAR, where the antennas were
waveguide slots on the leading edge of the wings.

The link above is horizontal polarization. The various examples of
Alford Slot antennas are all horizontally polarized.
http://www.eta.chalmers.se/~pgp/alfo...lford_eng.html
The various examples derived from the design by Trevor Marshall at:
http://www.trevormarshall.com/waveguides.htm
are all horizontal. Incidentally, the above article gives dimensions
and construction details for milling your own. More:
http://www.seattlewireless.net/index...ottedWaveguide

Another $300 antenna:

http://www.freenet-antennas.com/~fre...roducts_id=166

Horizontal polarization has some really nice advantages when dealing
with interference as most everyone else is using vertical
polarization.

Good luck, whatever you're trying to do.


--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# (E-Mail Removed)
# (E-Mail Removed) AE6KS

atec" <"atec77(atec) wrote:
> Any one got information as I need to shoot a link about 600 metres and
> am thinking a home made slot would be the ticket . (and ues its los
> if I go up 10 metres whixh means 15 metres of coax all up)

How about a USB connected transciever, no coax, that can be a ways away from
the computer, and small enuf to stick to/be part of a panel/dish/yagi
antenna? Boy.. I could use and sell a few of those....

Peter Pan wrote:
> atec" <"atec77(atec) wrote:
>> Any one got information as I need to shoot a link about 600 metres
>> and am thinking a home made slot would be the ticket . (and ues its
>> los if I go up 10 metres whixh means 15 metres of coax all up)
>
> How about a USB connected transciever, no coax, that can be a ways
> away from the computer, and small enuf to stick to/be part of a
> panel/dish/yagi antenna? Boy.. I could use and sell a few of those....

My friend just suggested an addition... Have both a USB and Ethernet (and
power) connection for runs longer than USB can handle, but within reach of
ethernet.

Jeff Liebermann wrote:
Jeff Liebermann wrote:
> On Fri, 04 Mar 2005 16:16:35 +1000, atec <"atec77(atec)"@hotmail.com>
> wrote:
>
>
>>Jeff Liebermann wrote:
>>
>>>On Fri, 04 Mar 2005 15:40:12 +1000, atec <"atec77(atec)"@hotmail.com>
>>>wrote:
>>>
>>>
>>>
>>>>Any one got information as I need to shoot a link about 600 metres and
>>>>am thinking a home made slot would be the ticket . (and ues its los if I
>>>>go up 10 metres whixh means 15 metres of coax all up)
>>>
>>>
>>>I'll assume 2.4GHz. 4 slot antenna:
>>>
>>>http://www.austwireless.com/catalog/...roducts_id/195
>>>Only $365/ea.
>>>
>>>Wanna disclose what you're trying to accomplish, what you have to work
>>>with, and why you think a horizontally polarized slot antenna, which
>>>is normally used as a sector antenna, is the "ticket"?
>
>
>> no I don't , I do know its the way to go , for my purposes.
>> nice link but Ill have to find more as I said I intend making one or
>>two of then , now why you assume its horizontal in polarisation ?
>
>
> I assumed horizontal polarization because vertically mounted slot
> antennas are almost always horizontally polarized. That's because you
> can build a vertically polarized sector antenna, with similar
> characteristics, much easier and cheaper using a vertical colinear.
>
> It is possible to design a vertically polarized slot antenna, but the
> geometry and pattern are rather odd looking. These were used for
> early WWII era aircraft night-fighter RADAR, where the antennas were
> waveguide slots on the leading edge of the wings.
>
> The link above is horizontal polarization. The various examples of
> Alford Slot antennas are all horizontally polarized.
> http://www.eta.chalmers.se/~pgp/alfo...lford_eng.html
> The various examples derived from the design by Trevor Marshall at:
> http://www.trevormarshall.com/waveguides.htm
> are all horizontal. Incidentally, the above article gives dimensions
> and construction details for milling your own. More:
> http://www.seattlewireless.net/index...ottedWaveguide
>
> Another $300 antenna:
>
> http://www.freenet-antennas.com/~fre...roducts_id=166
>
> Horizontal polarization has some really nice advantages when dealing
> with interference as most everyone else is using vertical
> polarization.
>
> Good luck, whatever you're trying to do.
>
>

> On Fri, 04 Mar 2005 16:16:35 +1000, atec <"atec77(atec)"@hotmail.com>
> wrote:
>
>
>>Jeff Liebermann wrote:
>>
>>>On Fri, 04 Mar 2005 15:40:12 +1000, atec <"atec77(atec)"@hotmail.com>
>>>wrote:
>>>
>>>
>>>
>>>>Any one got information as I need to shoot a link about 600 metres and
>>>>am thinking a home made slot would be the ticket . (and ues its los if I
>>>>go up 10 metres whixh means 15 metres of coax all up)
>>>
>>>
>>>I'll assume 2.4GHz. 4 slot antenna:
>>>
>>>http://www.austwireless.com/catalog/...roducts_id/195
>>>Only $365/ea.
>>>
>>>Wanna disclose what you're trying to accomplish, what you have to work
>>>with, and why you think a horizontally polarized slot antenna, which
>>>is normally used as a sector antenna, is the "ticket"?
>
>
>> no I don't , I do know its the way to go , for my purposes.
>> nice link but Ill have to find more as I said I intend making one or
>>two of then , now why you assume its horizontal in polarisation ?
>
>
> I assumed horizontal polarization because vertically mounted slot
> antennas are almost always horizontally polarized. That's because you
> can build a vertically polarized sector antenna, with similar
> characteristics, much easier and cheaper using a vertical colinear.
>
> It is possible to design a vertically polarized slot antenna, but the
> geometry and pattern are rather odd looking. These were used for
> early WWII era aircraft night-fighter RADAR, where the antennas were
> waveguide slots on the leading edge of the wings.
>
> The link above is horizontal polarization. The various examples of
> Alford Slot antennas are all horizontally polarized.
> http://www.eta.chalmers.se/~pgp/alfo...lford_eng.html
> The various examples derived from the design by Trevor Marshall at:
> http://www.trevormarshall.com/waveguides.htm
> are all horizontal. Incidentally, the above article gives dimensions
> and construction details for milling your own. More:
> http://www.seattlewireless.net/index...ottedWaveguide
>
> Another $300 antenna:
>
> http://www.freenet-antennas.com/~fre...roducts_id=166
>
> Horizontal polarization has some really nice advantages when dealing
> with interference as most everyone else is using vertical
> polarization.
>
> Good luck, whatever you're trying to do.
>
>
From the house to the office , why buy two dsl 3 mbs ?
I've opted for waves because I can make them in the neighbours shop ,
with a corner refletor and a vpn should do the trick and it will be
cheap Im sure ..
plenty of 9913 here and lots of connectors so I figure about an hour
each plus install at almost nothing each with coax .
looking at the retail prices Im glad I have the facilities .

Peter Pan wrote:
> atec" <"atec77(atec) wrote:
>
>>Any one got information as I need to shoot a link about 600 metres and
>>am thinking a home made slot would be the ticket . (and ues its los
>>if I go up 10 metres whixh means 15 metres of coax all up)
>
>
> How about a USB connected transciever, no coax, that can be a ways away from
> the computer, and small enuf to stick to/be part of a panel/dish/yagi
> antenna? Boy.. I could use and sell a few of those....
>
>
there is such a thing available . but I figure with a couple of hours of
my time , an ap and everything done with a bit of luck I have most of it
including a 2000 dlink ap , will be chap ( only way to do it)

On Fri, 04 Mar 2005 16:51:42 +1000, atec <"atec77(atec)"@hotmail.com>
wrote:

> From the house to the office , why buy two dsl 3 mbs ?

Why? Well, your ISP's terms of service may restrict redistribution of
bandwidth off the property limits. Of course, few enforce such
restrictions and everyone does wireless, so I think you're probably
safe.

> I've opted for waves because I can make them in the neighbours shop ,
>with a corner refletor and a vpn should do the trick and it will be
>cheap Im sure ..

Watch your tolerances. See the ACAD DWG on Trevor Marshall's site.
Note the tolerances. They're tight. I worked out the numbers in
another posting but the total error to drift out of the 2.4Ghz band
for a 1/2 wave dipole is something like 1.5mm max. This is not
something you can build with a drill, file, and tape measure.

> plenty of 9913 here and lots of connectors so I figure about an hour
>each plus install at almost nothing each with coax .
> looking at the retail prices Im glad I have the facilities .

9913 is not too good at 2.4Ghz (0.62db/meter @ 2.4Ghz). I prefer
LMR-400 (0.22dB/meter) but 9913 is good enough for short runs (less
than about a meter).

May I recommend you build a pair of biquad antennas instead.
http://martybugs.net/wireless/biquad/
http://www.trevormarshall.com/biquad.htm
Leave the coax fairly long so that you don't need a pigtail. I dunno
about finding a reverse TNC connector for 9913. Therefore, I suggest
a male N connector, and buying a female N to R-TNC adapter.
http://www.sky2web.net/rptncf-adapter.html
I hate to admit it, but I use RG-6/u and RG-58c/u for my biquads.
Very lossy, but for short runs, the coax doesn't have much effect.

Good luck.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# (E-Mail Removed)
# (E-Mail Removed) AE6KS

Jeff Liebermann wrote:
> On Fri, 04 Mar 2005 16:51:42 +1000, atec <"atec77(atec)"@hotmail.com>
> wrote:
>
>
>>From the house to the office , why buy two dsl 3 mbs ?
>
>
> Why? Well, your ISP's terms of service may restrict redistribution of
> bandwidth off the property limits. Of course, few enforce such
> restrictions and everyone does wireless, so I think you're probably
> safe.
it may , but there are ways , and seeing I have a fiscal interest it
doesn't matter ..
>
>
>> I've opted for waves because I can make them in the neighbours shop ,
>>with a corner refletor and a vpn should do the trick and it will be
>>cheap Im sure ..
>
>
> Watch your tolerances. See the ACAD DWG on Trevor Marshall's site.
> Note the tolerances. They're tight. I worked out the numbers in
> another posting but the total error to drift out of the 2.4Ghz band
> for a 1/2 wave dipole is something like 1.5mm max. This is not
> something you can build with a drill, file, and tape measure.
didn't read it did you . he has a serious machine shop , so a
vertical cnc and 20 minutes to set it up. easy
>
>
>> plenty of 9913 here and lots of connectors so I figure about an hour
>>each plus install at almost nothing each with coax .
>> looking at the retail prices Im glad I have the facilities .
>
>
> 9913 is not too good at 2.4Ghz (0.62db/meter @ 2.4Ghz). I prefer
> LMR-400 (0.22dB/meter) but 9913 is good enough for short runs (less
> than about a meter).
I'm a contractor and install all sorts of things as part of my
business, just found 40 metres of hard core .. any other problems ?
>
> May I recommend you build a pair of biquad antennas instead.
> http://martybugs.net/wireless/biquad/
> http://www.trevormarshall.com/biquad.htm
> Leave the coax fairly long so that you don't need a pigtail. I dunno
> about finding a reverse TNC connector for 9913. Therefore, I suggest
> a male N connector, and buying a female N to R-TNC adapter.
> http://www.sky2web.net/rptncf-adapter.html
> I hate to admit it, but I use RG-6/u and RG-58c/u for my biquads.
> Very lossy, but for short runs, the coax doesn't have much effect.
not interested in quads , been there and they work but because of the
situation at the office the slots will be almost invisible so that's
what I'm using , thanks anyway ... will have them made in another hour
or two and fit tomorrow...
>
> Good luck.
>