On 03/21/2017 05:51 AM, Scott Robbins wrote:> On Mon, Mar 20, 2017 at 05:09:55PM -0700, Robert Moskowitz wrote: >> I am looking for one of those very small USB wifi adapters for the server >> I am working on. I am tired of dealing with the 4" long TP-LINK I have >> and for my purposes, one of those little 1cm ones would do. But which >> work with Linux? When I was last in the store, only the TP-LINK said it >> was supported on Linux... > I've used the Edimax EW-7811Un on various flavors of Linux and BSD without > problems, > > https://www.amazon.com/Edimax-EW-7811Un-150Mbps-Raspberry-Supports/dp/B003MTTJOY > > $8.99 USD and free shipping on Amazon. >Those have worked for me as well. Their range, however, is a third or half as much as a normal wifi device.
On 3/21/2017 5:02 AM, ken wrote:>> > Those have worked for me as well. Their range, however, is a third or > half as much as a normal wifi device. >in general, the back of a server, buried under all the cables, and right up against the metal box is a lousy place for an RF antenna... -- john r pierce, recycling bits in santa cruz
On Tue, March 21, 2017 10:50 am, John R Pierce wrote:> On 3/21/2017 5:02 AM, ken wrote: >>> >> Those have worked for me as well. Their range, however, is a third or >> half as much as a normal wifi device. >> > > in general, the back of a server, buried under all the cables, and right > up against the metal box is a lousy place for an RF antenna...Agree. But it is even worse: iron is the worst case to have near GHz frequency antenna: it is conductor, but not the good one, hence it will eat up RF dissipating RF energy... Be it aluminum or copper, they will be just reflecting RF, thus creating funny ("interference") radiation pattern, but they will not dissipate RF energy. Similar "bad environment" for RF antennae was found in macbook titanium: antenna openings were in plastic frame, the last for better paint adhesion was metallized, first layer of metal film deposited on plastic is usually nickel, which is magnetic (with poor magnetic quality at 2.4 GHz), and poorly conductive. That is why macbook titanium had worst WiFi one ever had seen in laptops. Valeri> > -- > john r pierce, recycling bits in santa cruz > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
On 03/21/2017 11:50 AM, John R Pierce wrote:> On 3/21/2017 5:02 AM, ken wrote: >>> >> Those have worked for me as well. Their range, however, is a third >> or half as much as a normal wifi device. >> > > in general, the back of a server, buried under all the cables, and > right up against the metal box is a lousy place for an RF antenna... >My application is for a Cubieboard2 in its plastic case, sitting on my desk next to my notebook for development testing. Or in my hotel room or conference meeting 'wireless cafe'. Not for my production 'rack': http://medon.htt-consult.com/~rgm/cubieboard/cubietower-3.JPG
On 03/21/2017 11:50 AM, John R Pierce wrote:> On 3/21/2017 5:02 AM, ken wrote: >>> >> Those have worked for me as well. Their range, however, is a third >> or half as much as a normal wifi device. >> > > in general, the back of a server, buried under all the cables, and > right up against the metal box is a lousy place for an RF antenna... >Irrelevant to the use case I'm referring to.