Dave Martindale wrote:

"mike" writes:

Hi Jerry, Please review the picture I posted on
alt.binaires.schematics.electronic
in it you will see I'm trying to avoid connectors and cable carrying 2.4Ghz
R.F.
Thanks for being the only poster to have anything near a response to my
post.

Do note that many people's Usenet servers do not carry any binaries
groups, so they will be unable to look at your picture. If you were to
place the photo on a server where it can be accessed by HTTP or FTP,
these people would be able to get it. Many ISPs provide some web space
served by their own web server, and there are free photo hosting sites
like flickr.

Dave


http://www.usenet-replayer.com/group...lectronic.html

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

"mike" wrote in message
...

"Jerry Martes" wrote in message
news:KGKpi.5345$Da.3887@trnddc07...

"amdx" wrote in message
...
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

Hi Mike

You sure find some great information on the Web.

I consider this article Jason Hecker publishes
http://www.wlan.org.uk/jhecker.html to be ALL the instructions anyone
would need for constructing a 20 dB directivity WiFi antenna. I am
looking for some feedback from you on its performance.

If you plan to investigate basic effects of changing size and shape of
Helix antennas, EZNEC sure makes Helix antenna investigation easy.

I am just curious, what kind of coax and connectors are you using, and,
?how much coax?.

Jerry
Hi Jerry, Please review the picture I posted on
alt.binaires.schematics.electronic
in it you will see I'm trying to avoid connectors and cable carrying
2.4Ghz R.F.
Thanks for being the only poster to have anything near a response to my
post.
Mike


Hi Mike

My computer skills are really lacking. I dont know how to view your
images. I do spend alot of time learning about antennas. One of my
buddies tells me that he had poor results with the helix he built from the
instructions you cited. This site seems to have been better for my buddy.
http://www.pa0hoo.tk/.
Is it practical for you to use a Bridge at the input terminals of your
gain antenna so that the coax loss is minimized? That way, the antenna
(+Bridge) is connected to the computer with CAT 5 cable.
If it isnt too complicated, tell me how to view your images.

Thanks
Jerry

"Jerry Martes" wrote in message
news:lePpi.8517$Ub7.1313@trnddc04...

"mike" wrote in message
...

"Jerry Martes" wrote in message
news:KGKpi.5345$Da.3887@trnddc07...

"amdx" wrote in message
...
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

Hi Mike

You sure find some great information on the Web.

I consider this article Jason Hecker publishes
http://www.wlan.org.uk/jhecker.html to be ALL the instructions anyone
would need for constructing a 20 dB directivity WiFi antenna. I am
looking for some feedback from you on its performance.

If you plan to investigate basic effects of changing size and shape of
Helix antennas, EZNEC sure makes Helix antenna investigation easy.

I am just curious, what kind of coax and connectors are you using, and,
?how much coax?.

Jerry
Hi Jerry, Please review the picture I posted on
alt.binaires.schematics.electronic
in it you will see I'm trying to avoid connectors and cable carrying
2.4Ghz R.F.
Thanks for being the only poster to have anything near a response to my
post.
Mike


Hi Mike

My computer skills are really lacking. I dont know how to view your
images. I do spend alot of time learning about antennas. One of my
buddies tells me that he had poor results with the helix he built from the
instructions you cited. This site seems to have been better for my buddy.
http://www.pa0hoo.tk/.
Is it practical for you to use a Bridge at the input terminals of your
gain antenna so that the coax loss is minimized? That way, the antenna
(+Bridge) is connected to the computer with CAT 5 cable.
If it isnt too complicated, tell me how to view your images.

Thanks
Jerry


Hi Jerry,
I posted the drawing on another newsgroup called
alt.binaires.schematics.electronic
Not all ISPs carry binairy files so maybe you can't see it, if your address
is good I'll
email the drawing.
I looked at the site and it discouraged me. One site says 34mm diameter
tube another
42mm, one says a 71mm impedance match strip then another says it's longer. I
have no
way to measure the antenna when finished so I'd like to at least start with
the right
dimensions. I will say at least the site you gave does have some equipment
and his
measurements and reasoning make sense.
What is a bridge? I plan on putting a Usb wifi adapter at the antenna.
I hope to remove the smt antenna on the USB wifi card and attach the helical
antenna.
Thanks, Mike

Hi Jerry,
I posted the drawing on another newsgroup called
alt.binaires.schematics.electronic
Not all ISPs carry binairy files so maybe you can't see it, if your
address is good I'll
email the drawing.
I looked at the site and it discouraged me. One site says 34mm diameter
tube another
42mm, one says a 71mm impedance match strip then another says it's longer.
I have no
way to measure the antenna when finished so I'd like to at least start
with the right
dimensions. I will say at least the site you gave does have some equipment
and his
measurements and reasoning make sense.
What is a bridge? I plan on putting a Usb wifi adapter at the antenna.
I hope to remove the smt antenna on the USB wifi card and attach the
helical antenna.
Thanks, Mike


Hi Mike

I am too much 'a beginner' to be a good advisor for how to hook up devices
for WiFi reception. So, I wont try to define what a Bridge is. I will do
about anything (affordable) that allows the elimination of the coax in a 2.4
GHz system.
I do have some experience with making WiFi systems to extend the distance
at which Internet connections can be achieved. On one system I made for a
guy in Ranchita Calif, who has an agricultural business about 1/4 mile from
his house. I put an access point on a 4 foot diameter dish so he uses only
CAT 5 cable from his home Router to illuminate the dish. I then put a
Bridge on a smaller dish with CAT 5 cable to connect that dish to his lap
top in the field. It worked. My objective was to be able to use highly
directive antennas yet minimize coax line losses.
I think the use of a USB wireless adapter (TRENDnet TEW-445UB) Would be
easier than the way I made my system. Show Me cables sells reversing
polarity adapters that make it possible to use normal SMA connectors to the
TRENDnet USB TEW-445UB

Your project interests me. Tell me what you finally decide to do.
I have rejected the Helix. They are more difficult for me to understand
than a Yagi. The Helix is circularly polarized, so you loose 3 dB "off the
top" of any gain (directivity) plots. The Yagi is fairly easy to model with
EZNEC, so you can be fairly well assured that whatever you build will work
like the model.

Jerry

"amdx" wrote in message
...
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

The Wifi Helical antenna is an awful lot of work, and the performance of
even long structures on PVC tubing is vastly disappointing. The easiest 15
dBi (my measurement) gain antenna is the Biquad. In fact, if you make the
biquad with circular instead of square loops, the construction is even
easier, and there's no problem measuring with all those bends - - just one
wavelength of straight wire in a circular loop for each section - -
http://www.wikarekare.org/Antenna/bicircle.html But try to keep a 50-ohm
coaxial configuration all the way to the feed points as in
http://homepages.ihug.co.nz/~redwood4/ It isn't necessary to keep the
polyethylene insulation - - for a short length of air insulated coax, the
tubing ID should be 2.25 times the center conductor OD for 50 ohms
impedance.

If you are like me, you will probably want to build the Helical anyway - -
just to see, and perhaps to compare against the two easiest wifi antennas
with decent performance - Biquad and Waveguide
http://www.saunalahti.fi/elepal/antenna2.html The easiest waveguide can is
the 83mm ID one you get with the 28oz size of Bush's Baked Beans or any of a
number of other products like canned spaghetti sauce or family size
Spaghettis.

See if you can get a USB Wi-Spy Spectrum Analyzer module, too - - try to
find one of the original (no external antenna - - cheaper) versions, and
just put it in your own shielding enclosure and make your own modification
to cut the path to the built-in antenna so that you can run a small coax to
a connector on the box for your own external antenna connection. This kind
of modification has been made by others - -
http://www.metageek.net/default.aspx...5&view =topic
scroll down to the post by pe2er on 9/9/06 showing how to connect a coax to
the board. I used a type N connector on my enclosure because it's universal
and strong, and filtered the three USB supply and signal wires with
feed-thru capacitors so no RF can enter the enclosure through these other
paths. Use Metageek.'s Chanalyzer software to run the Wi-Spy module - -
preferably version 2.0 before the current 2.1.4 came out, since the need for
compatibility with both the $199 Wi-Spy and the $399 Wi-Spy made operation
with the $199 Wi-Spy somewhat unsatisfactory. Maybe you can ask Metageek to
allow access to previous Chanalyzer 2.0 for owners of the older units. Why
do you want all this? So you can make accurate measurement of the
differences between antennas, using a reference 1/2-wave dipole, or the
standard RPSMA antenna you find on most Wifi Routers. The dB calibration of
the Chanalyzer display is very accurate.

Chuck W6PKP

Spaghettis should read Spaghettios


"Chuck Olson" wrote in message
...

"amdx" wrote in message
...
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

The Wifi Helical antenna is an awful lot of work, and the performance of
even long structures on PVC tubing is vastly disappointing. The easiest 15
dBi (my measurement) gain antenna is the Biquad. In fact, if you make the
biquad with circular instead of square loops, the construction is even
easier, and there's no problem measuring with all those bends - - just one
wavelength of straight wire in a circular loop for each section - -
http://www.wikarekare.org/Antenna/bicircle.html But try to keep a 50-ohm
coaxial configuration all the way to the feed points as in
http://homepages.ihug.co.nz/~redwood4/ It isn't necessary to keep the
polyethylene insulation - - for a short length of air insulated coax, the
tubing ID should be 2.25 times the center conductor OD for 50 ohms
impedance.

If you are like me, you will probably want to build the Helical anyway - -
just to see, and perhaps to compare against the two easiest wifi antennas
with decent performance - Biquad and Waveguide
http://www.saunalahti.fi/elepal/antenna2.html The easiest waveguide can is
the 83mm ID one you get with the 28oz size of Bush's Baked Beans or any of
a
number of other products like canned spaghetti sauce or family size
Spaghettis.

See if you can get a USB Wi-Spy Spectrum Analyzer module, too - - try to
find one of the original (no external antenna - - cheaper) versions, and
just put it in your own shielding enclosure and make your own modification
to cut the path to the built-in antenna so that you can run a small coax
to
a connector on the box for your own external antenna connection. This kind
of modification has been made by others - -

http://www.metageek.net/default.aspx...5&view =topic
scroll down to the post by pe2er on 9/9/06 showing how to connect a coax
to
the board. I used a type N connector on my enclosure because it's
universal
and strong, and filtered the three USB supply and signal wires with
feed-thru capacitors so no RF can enter the enclosure through these other
paths. Use Metageek.'s Chanalyzer software to run the Wi-Spy module - -
preferably version 2.0 before the current 2.1.4 came out, since the need
for
compatibility with both the $199 Wi-Spy and the $399 Wi-Spy made operation
with the $199 Wi-Spy somewhat unsatisfactory. Maybe you can ask Metageek
to
allow access to previous Chanalyzer 2.0 for owners of the older units. Why
do you want all this? So you can make accurate measurement of the
differences between antennas, using a reference 1/2-wave dipole, or the
standard RPSMA antenna you find on most Wifi Routers. The dB calibration
of
the Chanalyzer display is very accurate.

Chuck W6PKP

"Chuck Olson" wrote in message
...

"amdx" wrote in message
...
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

The Wifi Helical antenna is an awful lot of work, and the performance of
even long structures on PVC tubing is vastly disappointing. The easiest 15
dBi (my measurement) gain antenna is the Biquad. In fact, if you make the
biquad with circular instead of square loops, the construction is even
easier, and there's no problem measuring with all those bends - - just one
wavelength of straight wire in a circular loop for each section - -
http://www.wikarekare.org/Antenna/bicircle.html But try to keep a 50-ohm
coaxial configuration all the way to the feed points as in
http://homepages.ihug.co.nz/~redwood4/ It isn't necessary to keep the
polyethylene insulation - - for a short length of air insulated coax, the
tubing ID should be 2.25 times the center conductor OD for 50 ohms
impedance.

If you are like me, you will probably want to build the Helical anyway - -
just to see, and perhaps to compare against the two easiest wifi antennas
with decent performance - Biquad and Waveguide
http://www.saunalahti.fi/elepal/antenna2.html The easiest waveguide can is
the 83mm ID one you get with the 28oz size of Bush's Baked Beans or any of
a
number of other products like canned spaghetti sauce or family size
Spaghettis.

See if you can get a USB Wi-Spy Spectrum Analyzer module, too - - try to
find one of the original (no external antenna - - cheaper) versions, and
just put it in your own shielding enclosure and make your own modification
to cut the path to the built-in antenna so that you can run a small coax
to
a connector on the box for your own external antenna connection. This kind
of modification has been made by others - -
http://www.metageek.net/default.aspx...5&view =topic
scroll down to the post by pe2er on 9/9/06 showing how to connect a coax
to
the board. I used a type N connector on my enclosure because it's
universal
and strong, and filtered the three USB supply and signal wires with
feed-thru capacitors so no RF can enter the enclosure through these other
paths. Use Metageek.'s Chanalyzer software to run the Wi-Spy module - -
preferably version 2.0 before the current 2.1.4 came out, since the need
for
compatibility with both the $199 Wi-Spy and the $399 Wi-Spy made operation
with the $199 Wi-Spy somewhat unsatisfactory. Maybe you can ask Metageek
to
allow access to previous Chanalyzer 2.0 for owners of the older units. Why
do you want all this? So you can make accurate measurement of the
differences between antennas, using a reference 1/2-wave dipole, or the
standard RPSMA antenna you find on most Wifi Routers. The dB calibration
of
the Chanalyzer display is very accurate.

Chuck W6PKP


Thanks Chuck,
That BiQuad seems very simple and 14dbi seems like a lot for a simple
small antenna.
As for all the other fun stuff, not now, all I want now is internet access.
But I need some gain.
I'm still waiting for my USB wifi adapter card to arrive. I hope to have an
antenna ready to
connect to the USB wifi adapter card.
Mike

amdx wrote:

If you wish to use a router/switch/adapter with a fixed antenna, this
page may be helpful:

http://www.freeantennas.com/projects/template/

Regards,
JS

Thanks Chuck,
That BiQuad seems very simple and 14dbi seems like a lot for a simple
small antenna.
As for all the other fun stuff, not now, all I want now is internet access.
But I need some gain.
I'm still waiting for my USB wifi adapter card to arrive. I hope to have an
antenna ready to
connect to the USB wifi adapter card.
Mike

On Jul 25, 8:13 am, "amdx" wrote:
Please see subject line-- Help, Wifi Antenna-- on
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.http://www.wlan.org.uk/jhecker.html

This is to extend the range of my laptop computer.

Mike

From my previous post on this topic:

FYI, alt.internet.wireless discusses this topic often.

I prefer the biquad antenna, which you can augment with a dish. I have
a short-cut method to build this antenna. With a combination of these
photographs and this link, you should be able to figure it out.

http://martybugs.net/wireless/biquad/
http://www.lazygranch.com/images/wifi/wifi_bq_1.jpg
http://www.lazygranch.com/images/wifi/wifi_bq_2.jpg

Note you don't need to make the loop a square. Use a circle of the
same circumference.

There is a disadvantage to using the helix. It will receive both
horizontal and vertical polarization. Most sites just send in one
polarization. In busy areas, the same channel will be used in
different sites with different polarity. Now if you use the helix to
illuminate a dish, then the circular polarization is fine and perhaps
desirable. That is, you could sniff out signals without the
attenuation associated with having the wrong polarization.

On Wed, 25 Jul 2007 10:13:26 -0500, "amdx" wrote:

Help, Wifi Antenna

Looking to combine Helical antenna and Wifi adapter card in one unit.
I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.

This is to extend the range of my laptop computer.

Why not to use an older 802.11g
Usb Wlan stick (good one w/ onboard chip smd ceramic antenna, much
better than w/ Pcb printed one) & some "metal" DIY "range enhancers"
? :-)

See pics & data & measures in cm
to get some clues & ideas
(text is in my native-slovene, so you won´t understand it;
sorry, still had no time to make an english version of that articles
for those UsbKey active antennas; inside URLs can be also seen at
wish...)

DIY wifi USBkeY range Enhancers-boosters ´4 Dummies´ :-)
http://www.wlan-sat.com/modules.php?...=26476#264 76

Ultimate wifi antenna TinCan Enhancers - part-2 ... :-)
http://www.wlan-sat.com/modules.php?...ewtopic&t=4782

problems with Usb cable lenght limitation? No more even w/o powered
hubs ... :-) (DIY, custom up to 21m, all data in english there on
schematics!))

http://www.wlan-sat.com/modules.php?...ewtopic&t=4216

Have fun! :-)


There is also to check other stuff at wish:

Default Wlan Pci Card antenna_on_cable Enhancer 6dBi
http://www.wlan-sat.com/modules.php?...ewtopic&t=3847

Cornet enhancers for some different type antennas up to 12dBi
http://www.wlan-sat.com/modules.php?...ewtopic&t=4241

& also parabolic pot or wok cover (+ bucket shape add-on) "passive"
antenna experiment with at least 20dBi gain:
STâ„¢-maxX antena (= project-X) 21dbi
http://www.wlan-sat.com/modules.php?...ewtopic&t=3993

well, I think that now you´ve got enough material (pics &
drawings/sketches) to check & maybe try some stuff by yourself :-))
--
Regards , SPAJKY ®
mail addr. @ my site @ http://www.spajky.vze.com
5y - "Tualatin OC-ed / BX-Slot1 / inaudible setup!"