George Hardesty

Jul 152009
 

 Alfa 1000mW client works on Fedora 7 Linux:

You have to add the line “alias wlan0 rtl8187” to the file /etc/modprobe.conf Then reboot. after booting into the GUI go to System | Administration | Network. New – Wireless – Follow it through.
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Alfa compatible profile manager / site survey wizard for linux – Fedora 7.

Open a terminal and type in “yum install wlassistant”

this will then show up under system | preferences as Wireless Assistant.
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This information provided by:  Brendon Prole

Jul 152009
 

 We’re over the moon that we can get one of your Alfas to work over such a wopping distance. If you’d like us to say anything or about any of the other products we have bought from you please let us know.

Sylvan Andrew  Oct. ’07

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The 500mw Alfa card with the optional 9 dbi antenna brings in excellent internet connectivity to my sailboat.

Within the next couple of days, will take my laptop and Alfa card (with both the standard and the optional 9 dbi antenna) and see if I can pick up the internet from the furthest points in the Marina.

Roger Freedman – October ’07

Jul 152009
 

Based on what I’ve been told by an expert in the Realtek chipsets:

Realtek chipsets are the best in terms of compatibility with both Mac and Linux.

I’m not a Mac user and so I don’t have any first-hand experience or knowledge about how to configure.  But I think that your best bet is to download drivers from the realtek website.

Will very much appreciate if Mac users will post comments about their experiences with the Alfa AWUS036H.

Alfa AWUS036H has a realtek chipset.

 Posted by at 9:47 am Mac compatibility Tagged with:  No Responses »
Jul 152009
 

NOTE: Alfa AWUS036 is the lower-power version – NOT the ALFA 500mW USB ADAPTER (that item is part# AWUS036H)

In order to get the “Alfa awus036” adapter working on an intel mac mini, osx 10.4, i had to download the drivers from the Ralink site. The included drivers on the cd were only for Windows and the native apple drivers did not work. Also, turn off Airport.   It works perfect now, as the other item i bought. Thanks for the great deals.

Chris Norris

The link to the drivers is:  http://www.ralinktech.com/ralink/Home/Support/Macintosh.html

 Posted by at 9:43 am Mac compatibility Tagged with:  No Responses »
Jul 152009
 

Alfa 1000mW USB adapter in the past (2006 to 2008) came with a USB Y cable (that has two connectors):

The dual lead USB cables were included in the past only to provide electric power for old laptops from the 1990s.  The dual USB cable had nothing to do with Tx/Rx output.

Old laptops/notebooks from the 1990s do not support full USB power such as 3.3V 1A.  New notebooks have full support so, it’s no problem to use only one USB connectors on the cable (if using the Y-type USB cable, you can use only the larger of the two USB plugs).

If your notebook is old:  If you want full output power, better to use 2 USB connector.

Jul 152009
 

Receive Sensitivity for 802.11g: 54Mpbs (64QAM): -76dbm
48Mbps (64QAM): -71dbm
36Mpbs (16QAM): -78dbm
24Mbps (16QAM): -80dbm
18Mbps (QPSK): -81dbm
12Mpbs (QPSK): -82dbm
9Mbps (BPSK): -85dbm
6Mbps (BPSK): -91dbm
(typically @PER < 10% packet size 1024 and @25ºC + 5ºC)

 Posted by at 9:39 am Alfa AWUS036H Tagged with:  No Responses »
Jul 152009
 

Another great sure-fire tip from customer/Alfa user Trey MacDonald, in his words:

“…I found will significantly improve the “perceived” performance on the part of the Alfa Network USB client.

For starters, I’m assuming that for the most part, customers who purchase this unit are trying to achieve longer distance connections, etc,..”in the neighborhood” (wink, wink)….

One problem with this, is that most people leave their wireless hubs, set to the default..Let’s say, “linksys” on channel 6… Consequently buying a directional antenna is essential to sorting out the signals.

Nevertheless, even when you get a connection, the other signals can “bleed in” and disrupt the traffic.

Obviously, there are parameters which can be modified, with respect to packet-size, and fragmentation threshold, etc. – in conjunction with a good “ping” tool such as:

http://www.colasoft.com/ping_tool/

Which will allow someone to adjust packet sizes, frequency, and TTL….

BUT – this requires some competency and understanding – Which may be above the comprehension of the average user..

Here’s the tip.Once installed, go to the Control Panels/Network Connections
Right-click on the USB Network Adapter and Select Properties
Click on the Configure button on the right-hand top, of the General tab

Go to the Advanced tab
Set the value of “Long Retry Count” to a higher value – The default is 7, (I used 21)
Set the value of “Short Retry Count” to a higher value – The default is 7, (I used 21)

Click OK.

That’s it !

The effect of making this change, is that the adapter will retry the packets (both long and short) many more times AT THE DRIVER LEVEL before reporting an error. In many cases this will overcome poor reception or disruptive interference.

The consequence to the end-user is that the connection appears to be more reliable, because the driver is doing all of the work of repeating packets…

This solution is significantly less complicated than actually tuning the connection – but it has the desired effect. I think in the circumstances I described, quite profound.

The reason for this, is for the most part, web-based protocols like HTTP – use what’s called “AT LEAST ONCE” semantics – which means they automatically discard duplicate packets – therefore the effect of re-transmitting is non-consequential…and is much preferred to the driver reporting back to the browser that the connection itself has “stalled” …or to the OS that the connection has been dropped. The idea is to perform the re-transmit at the lowest overhead point – at the driver.

-Trey MacDonald

Jul 152009
 

Alfa 500mW USB adapters are prone to drop the connection about once a day for no apparent reason.  Here is the fix in Windows (less than 30 seconds):

DROPPED CONNECTION REPAIR

Click this icon WiFi-icon  in your system tray.  Click “Support” tab, then “Repair” button.

This is not a permanent fix – it will quickly re-connect the adapter the the network.


A savvy customer told me that the
high power of the card itself causes dropped connections. When I find all the technical details that explain how this happens, I will post here.

Jul 152009
 

DOWNLOAD page of drivers for various operating systems, for the Alfa 500mW USB adapter:

http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PFid=1&Level=6&Conn=5&ProdID=35&DownTypeID=3&GetDown=false&Downloads=true

There is a driver on this page that works with MacOS 10.4 (Tiger) / Mac iBook G4

One of our customers confirmed that it works.

My understanding has been that the realtek chipset in the adapter is the most friendly chipset to all OS’s and have heard & read that it auto-installs on macs.

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