For those who are using WiFi 802,G beam on S band
I just found that my Pacific Wireless WIMAX VA 25 -16 antenna for 2.4GHZ has a bandwidth starting at 2.5ghz to 2.7ghz (www.pacwireless.com) Even if at theses frequencies things are a bit larger i'm guessing the 16db gain figures are surely not standing at 2.4ghz. Did any one have a ball game figures of what remains at 2.4ghz? I have no way to measure SWR at this frequency and this is surely not optimal?
Conclusion don't jump too fast on some hamfest deal as what's good for WiFI is not always so good at 2.4ghz!
P.S. I can use the antenna on 2.4ghz and i got fairly good signal from AO-51 when he's in S mode but i cannot get rid out of the fades. Could be i found why?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Hello Luc,
Like any other fleamarket/hamfest/ebay item, you do not know what you have till you get it home and and evaluated on the test bench. Bid accordingly.....
The feed is probably a simple dipole. Take the plastic housing apart and tune the dipole (shorten/lengthen) to where you want it.
Or, get another feed for the freqs needed. The manufacturer may offer different freq response feeds for their same dish.
My first gridded dish I tuned up for 2304 MHz and it performed well afterwards. The gridded dish on the satellite tower came with a decent VSWR at 2400 MHz.
The fades in reception of 2.4 GHz satellites are due to using a linear polarization and NOT a circular polarization. Try a circularly polarized feed. Or try a H AND a V linearly polarized antenna system, select in the shack which one to listen to.
Stan,W1LE Cape Cod FN41sr
Luc Leblanc wrote:
For those who are using WiFi 802,G beam on S band
I just found that my Pacific Wireless WIMAX VA 25 -16 antenna for 2.4GHZ has a bandwidth starting at 2.5ghz to 2.7ghz (www.pacwireless.com) Even if at theses frequencies things are a bit larger i'm guessing the 16db gain figures are surely not standing at 2.4ghz. Did any one have a ball game figures of what remains at 2.4ghz? I have no way to measure SWR at this frequency and this is surely not optimal?
Conclusion don't jump too fast on some hamfest deal as what's good for WiFI is not always so good at 2.4ghz!
P.S. I can use the antenna on 2.4ghz and i got fairly good signal from AO-51 when he's in S mode but i cannot get rid out of the fades. Could be i found why?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
On 16 May 2009 at 11:16, Stan W1LE wrote:
The fades in reception of 2.4 GHz satellites are due to using a linear polarization and NOT a circular polarization. Try a circularly polarized feed. Or try a H AND a V linearly polarized antenna system, select in the shack which one to listen to.
Stan,W1LE Cape Cod FN41sr
Hi Stan
That's what i think first but on S band AO-51 use a vertical double band stub antenna and normally it should transmit a vertically polarized signal?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Hi Luc,
Conclusion don't jump too fast on some hamfest deal as what's good for WiFI is not always so good at 2.4ghz!
This was probably just a typo; if so, pardon the reply...
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
P.S. I can use the antenna on 2.4ghz and i got fairly
good signal from AO-51 when he's in S mode but i cannot get rid out of the fades.
Could be i found why?
Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
_________________________________________________________________ Hotmail® has ever-growing storage! Don’t worry about storage limits. http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutoria...
At 10:33 AM 5/16/2009, Greg D. wrote:
------------------snip--------- Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
I have toyed with using a comercial medium gain patch array for 2.4 GHz Leos. I would guess that there is no incentive to use circular pol for terrestrial data links. Even reflections and multi-path signals would remain linear. Space com is a totally different deal and circular makes sense if there is room for the CP antenna on the sat.
I still have my 85cm offset dish fed with short helix for AO-40 2.4 GHz, but I expect the narrow beamwidth would be lots of trouble for manual tracking 2.4 Leos. That is why I thought to use a 10-dB commercial antenna (also cheap and easy). Is CP a better idea? ...and would one need to reverse the sense on 2.4 GHz very often?
73, Ed - KL7UW
I have toyed with using a comercial medium gain patch array for 2.4 GHz Leos. I would guess that there is no incentive to use circular pol for terrestrial data links. Even reflections and multi-path signals would remain linear. Space com is a totally different deal and circular makes sense if there is room for the CP antenna on the sat.
Hi Ed, et al
Try the Patchxxx and the 2.4GigsPatchFeed on:
http://tinyurl.com/wb6lloOscar
Worked well for me on the HEOs..
The nylon "pull string" is probably gilding the lily, just move the disc, and get out of the way!!
73, Dave, WB6LLO [email protected]
Disagree: I learn....
Pulling for P3E...
Greg,
You got me thinking about going circular! I am wondering how you build an omnidirectional Circular antenna? What am I missing as I don't want my router or my notebook to be directional?
Don -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Edward Cole Sent: Saturday, May 16, 2009 12:22 PM To: Greg D.; [email protected]; [email protected] Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
At 10:33 AM 5/16/2009, Greg D. wrote:
------------------snip--------- Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do
it.
Enjoy the new toy,
Greg KO6TH
Hi Don,
Perhaps use a design such as a Lindenblad or a Quadrifillar Helix; you don't have enough space to put one on the laptop, so it's got to go on the AP.
Of course, you lose 3db going circular->linear. Maybe that's the problem. They'd rather double the radios and put one vertical, and the other horizontal (or put 3 in there with 802.11n)...
Greg KO6TH
From: [email protected] To: [email protected] Date: Sat, 16 May 2009 14:48:56 -0700 Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Greg,
You got me thinking about going circular! I am wondering how you build an omnidirectional Circular antenna? What am I missing as I don't want my router or my notebook to be directional?
Don -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Edward Cole Sent: Saturday, May 16, 2009 12:22 PM To: Greg D.; [email protected]; [email protected] Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
At 10:33 AM 5/16/2009, Greg D. wrote:
------------------snip--------- Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do
it.
Enjoy the new toy,
Greg KO6TH
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_________________________________________________________________ Windows Live™: Keep your life in sync. http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009
Not that they were optimum tuned for the 2.5 GHz frequency but what polarity were the "Pringles Can" washer antennas that were so popular for Net-Stumbling a few years ago?
Roger WA1KAT ----- Original Message ----- From: "Greg D." [email protected] To: [email protected]; [email protected] Sent: Saturday, May 16, 2009 2:33 PM Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Hi Luc,
Conclusion don't jump too fast on some hamfest deal as what's good for
WiFI is not always so good at 2.4ghz!
This was probably just a typo; if so, pardon the reply...
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
P.S. I can use the antenna on 2.4ghz and i got fairly
good signal from AO-51 when he's in S mode but i cannot get rid out of the fades.
Could be i found why?
Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
_________________________________________________________________ Hotmail® has ever-growing storage! Don’t worry about storage limits. http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutoria l_Storage1_052009 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hi Roger,
The Pringles Can antennas are linearly polarized along the line of the "probe" stuck in at the bottom. It's actually a 1/4 wave feed.
Years ago I took a 7 turn helix and a co-worker's Pringles can out to the courtyard at work, aiming back into the building just to see how vulnerable a building's Wi-Fi signal is. The helix clearly out performed the Pringles, and I found that the Pringles was very susceptible to how it was rotated (as expected). But, "vertical" wasn't quite where I expected it. Rather it was some 15 or 20 degrees off. I have no idea if the Access Point was mounted at an angle, or if it was some other effect.
And, yes, I could clearly receive the network traffic.
Greg KO6TH
From: [email protected] To: [email protected] Date: Sat, 16 May 2009 17:27:25 -0400 Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Not that they were optimum tuned for the 2.5 GHz frequency but what polarity were the "Pringles Can" washer antennas that were so popular for Net-Stumbling a few years ago?
Roger WA1KAT ----- Original Message ----- From: "Greg D." [email protected] To: [email protected]; [email protected] Sent: Saturday, May 16, 2009 2:33 PM Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Hi Luc,
Conclusion don't jump too fast on some hamfest deal as what's good for
WiFI is not always so good at 2.4ghz!
This was probably just a typo; if so, pardon the reply...
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
P.S. I can use the antenna on 2.4ghz and i got fairly
good signal from AO-51 when he's in S mode but i cannot get rid out of the fades.
Could be i found why?
Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
Hotmail® has ever-growing storage! Don’t worry about storage limits. http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutoria l_Storage1_052009 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_________________________________________________________________ Hotmail® has a new way to see what's up with your friends. http://windowslive.com/Tutorial/Hotmail/WhatsNew?ocid=TXT_TAGLM_WL_HM_Tutori...
On 16 May 2009 at 17:27, Roger Kolakowski wrote:
A part of my mystery is solved WiFi and WiMAX I am not a big fan of WiFi as i have some security concern but i discover that i don't have the best antenna for 2.4 and fiddling with it is not an option. A true 2.4 is in the mail to replace it and with 2 antennas now i will be able to install them to have vertical and horizontal polarisation and i will see if there is some improvement at 2.4ghz when switching between them. Nobody answer me back regarding the S band linear "not circular" AO-51 antenna but the fades are probably due to some antenna blocking than anything else. On the last S band session me and Clare VE3NPC noted that the fades does not happen at the same time on our respective QTH there is surely not some selective circular polarisation path?
This was probably just a typo; if so, pardon the reply...
I was mixing both...hi
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
Enjoy the new toy,
Greg KO6TH
Some experimenting to come on the next S band session.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Hi Luc,
a linearly polarized antenna on a satellite means, that you will see different polarization at different times and different locations on Earth. Assume the satellites transmit vertical polarization but "tumbles" then the polarization you are receiving is always linear but can vary between vertical, diagonal, horizontal ... Therefore it is better if the satellite and the station on earth both use circular polarization. If this is not possible due to constraints on the satellite I think it is still better to have a circular polarized antenna at my station as the losses due to varying linear polarization will always be only 3dB and thus no strong fading due to polarization will accur. Please note that a tumbling satellite will most likely still generate strong fading as the antenna on the satellite will never have a perfect omni-directional behaviour.
Best regards
Matthias DD1US
www.dd1us.de
-----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von Luc Leblanc Gesendet: Sonntag, 17. Mai 2009 14:09 An: [email protected] Betreff: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
On 16 May 2009 at 17:27, Roger Kolakowski wrote:
A part of my mystery is solved WiFi and WiMAX I am not a big fan of WiFi as i have some security concern but i discover that i don't have the best antenna for 2.4 and fiddling with it is not an option. A true 2.4 is in the mail to replace it and with 2 antennas now i will be able to install them to have vertical and horizontal polarisation and i will see if there is some improvement at 2.4ghz when switching between them. Nobody answer me back regarding the S band linear "not circular" AO-51 antenna but the fades are probably due to some antenna blocking than anything else. On the last S band session me and Clare VE3NPC noted that the fades does not happen at the same time on our respective QTH there is surely not some selective circular polarisation path?
This was probably just a typo; if so, pardon the reply...
I was mixing both...hi
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
Enjoy the new toy,
Greg KO6TH
Some experimenting to come on the next S band session.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
One important feature of circular to circular antenna reception is the 30 dB of rejection of signals that are opposite polarity from ground and building reflections that will cause QSB on linear antennas used for reception. If you are 30 miles out to sea this is not a concern. Art, KC6UQH
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matthias Bopp Sent: Sunday, May 17, 2009 7:38 AM To: [email protected] Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Hi Luc,
a linearly polarized antenna on a satellite means, that you will see different polarization at different times and different locations on Earth. Assume the satellites transmit vertical polarization but "tumbles" then the polarization you are receiving is always linear but can vary between vertical, diagonal, horizontal ... Therefore it is better if the satellite and the station on earth both use circular polarization. If this is not possible due to constraints on the satellite I think it is still better to have a circular polarized antenna at my station as the losses due to varying linear polarization will always be only 3dB and thus no strong fading due to polarization will accur. Please note that a tumbling satellite will most likely still generate strong fading as the antenna on the satellite will never have a perfect omni-directional behaviour.
Best regards
Matthias DD1US
www.dd1us.de
-----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von Luc Leblanc Gesendet: Sonntag, 17. Mai 2009 14:09 An: [email protected] Betreff: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
On 16 May 2009 at 17:27, Roger Kolakowski wrote:
A part of my mystery is solved WiFi and WiMAX I am not a big fan of WiFi as i have some security concern but i discover that i don't have the best antenna for 2.4 and fiddling with it is not an option. A true 2.4 is in the mail to replace it and with 2 antennas now i will be able to install them to have vertical and horizontal polarisation and i will see if there is some improvement at 2.4ghz when switching between them. Nobody answer me back regarding the S band linear "not circular" AO-51 antenna but the fades are probably due to some antenna blocking than anything else. On the last S band session me and Clare VE3NPC noted that the fades does not happen at the same time on our respective QTH there is surely not some selective circular polarisation path?
This was probably just a typo; if so, pardon the reply...
I was mixing both...hi
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
Enjoy the new toy,
Greg KO6TH
Some experimenting to come on the next S band session.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4081 (20090517) __________
The message was checked by ESET NOD32 Antivirus.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4081 (20090517) __________
The message was checked by ESET NOD32 Antivirus.
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Hi Art,
this is a very good point. This is also one of the reasons why circular polarization was chosen for the commercial GPS system.
Best regards
Matthias
www.dd1us.de (including many soundfiles of AMSAT satellites)
-----Ursprüngliche Nachricht----- Von: Art McBride [mailto:[email protected]] Gesendet: Dienstag, 19. Mai 2009 07:50 An: 'Matthias Bopp'; [email protected] Betreff: RE: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
One important feature of circular to circular antenna reception is the 30 dB of rejection of signals that are opposite polarity from ground and building reflections that will cause QSB on linear antennas used for reception. If you are 30 miles out to sea this is not a concern. Art, KC6UQH
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matthias Bopp Sent: Sunday, May 17, 2009 7:38 AM To: [email protected] Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
Hi Luc,
a linearly polarized antenna on a satellite means, that you will see different polarization at different times and different locations on Earth. Assume the satellites transmit vertical polarization but "tumbles" then the polarization you are receiving is always linear but can vary between vertical, diagonal, horizontal ... Therefore it is better if the satellite and the station on earth both use circular polarization. If this is not possible due to constraints on the satellite I think it is still better to have a circular polarized antenna at my station as the losses due to varying linear polarization will always be only 3dB and thus no strong fading due to polarization will accur. Please note that a tumbling satellite will most likely still generate strong fading as the antenna on the satellite will never have a perfect omni-directional behaviour.
Best regards
Matthias DD1US
www.dd1us.de
-----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von Luc Leblanc Gesendet: Sonntag, 17. Mai 2009 14:09 An: [email protected] Betreff: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
On 16 May 2009 at 17:27, Roger Kolakowski wrote:
A part of my mystery is solved WiFi and WiMAX I am not a big fan of WiFi as i have some security concern but i discover that i don't have the best antenna for 2.4 and fiddling with it is not an option. A true 2.4 is in the mail to replace it and with 2 antennas now i will be able to install them to have vertical and horizontal polarisation and i will see if there is some improvement at 2.4ghz when switching between them. Nobody answer me back regarding the S band linear "not circular" AO-51 antenna but the fades are probably due to some antenna blocking than anything else. On the last S band session me and Clare VE3NPC noted that the fades does not happen at the same time on our respective QTH there is surely not some selective circular polarisation path?
This was probably just a typo; if so, pardon the reply...
I was mixing both...hi
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
Enjoy the new toy,
Greg KO6TH
Some experimenting to come on the next S band session.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4081 (20090517) __________
The message was checked by ESET NOD32 Antivirus.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4081 (20090517) __________
The message was checked by ESET NOD32 Antivirus.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4085 (20090519) __________
The message was checked by ESET NOD32 Antivirus.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4085 (20090519) __________
The message was checked by ESET NOD32 Antivirus.
Although it is a good thought I can not take credit for the writing of it...Roger WA1KAT
----- Original Message ----- From: "Luc Leblanc" [email protected] To: [email protected] Sent: Sunday, May 17, 2009 8:09 AM Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
On 16 May 2009 at 17:27, Roger Kolakowski wrote:
A part of my mystery is solved WiFi and WiMAX I am not a big fan of WiFi
as i have some security concern but i discover that i don't have
the best antenna for 2.4 and fiddling with it is not an option. A true 2.4
is in the mail to replace it and with 2 antennas now i will be
able to install them to have vertical and horizontal polarisation and i
will see if there is some improvement at 2.4ghz when switching
between them. Nobody answer me back regarding the S band linear "not
circular" AO-51 antenna but the fades are probably due to some
antenna blocking than anything else. On the last S band session me and
Clare VE3NPC noted that the fades does not happen at the same time
on our respective QTH there is surely not some selective circular
polarisation path?
This was probably just a typo; if so, pardon the reply...
I was mixing both...hi
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation), so a properly designed Wi-Fi antenna could be good for 13cm Ham applications.
Enjoy the new toy,
Greg KO6TH
Some experimenting to come on the next S band session.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hello,
recently I received some additional audio recordings and could thus complement my "Sounds from Space" collection of satellite signals.
Many thanks to Rolf DK2ZF and Dave WB6LLO for providing their recordings.
You may have a look at www.dd1us.de at "Sounds from Space" and enjoy listening to our satellites (present ones and those who are already gone).
If anyone of this group has some old tapes or other recordings please let me know. I am still missing recordings from a couple of satellites and even for those satellites, where I have already recordings, I am always looking for additional interesting audio files.
Best regards 55&73
Matthias DD1US
www.dd1us.de
Roger Kolakowski wrote:
Not that they were optimum tuned for the 2.5 GHz frequency but what polarity were the "Pringles Can" washer antennas that were so popular for Net-Stumbling a few years ago?
Theoretically linear, but they should be considered to be a quarter wave vertical with some crap lying around in the nearfield. They don't have any gain, and they certainly don't work as yagis - in fact, they work better sideways!
The can needs to be made of metal, and about 85mm in diameter. That will give you a belter of a wifi antenna. The threaded rod and washer idea is just stupid. Leave that off.
Gordon
participants (10)
-
Art McBride -
Dave Guimont -
Don Ferguson -
Edward Cole -
Gordon JC Pearce -
Greg D. -
Luc Leblanc -
Matthias Bopp -
Roger Kolakowski -
Stan W1LE