Why make one when you can buy for just $30 I used to make antennas to but when local suppliers do them cheap, id rather be drinking. http://wifitech.com.au/catalog/index.php/cPath/33
Steve -----Original Message----- From: ubuntu-au-boun...@lists.ubuntu.com [mailto:ubuntu-au-boun...@lists.ubuntu.com] On Behalf Of ubuntu-au-requ...@lists.ubuntu.com Sent: Saturday, 13 February 2010 23:00 To: ubuntu-au@lists.ubuntu.com Subject: ubuntu-au Digest, Vol 48, Issue 11 Send ubuntu-au mailing list submissions to ubuntu-au@lists.ubuntu.com To subscribe or unsubscribe via the World Wide Web, visit https://lists.ubuntu.com/mailman/listinfo/ubuntu-au or, via email, send a message with subject or body 'help' to ubuntu-au-requ...@lists.ubuntu.com You can reach the person managing the list at ubuntu-au-ow...@lists.ubuntu.com When replying, please edit your Subject line so it is more specific than "Re: Contents of ubuntu-au digest..." Today's Topics: 1. 850 MHz Wireless Broadband Modem Antenna (Geoffrey) ---------------------------------------------------------------------- Message: 1 Date: Fri, 12 Feb 2010 17:43:38 +1000 From: Geoffrey <gcomb...@bigpond.com> Subject: 850 MHz Wireless Broadband Modem Antenna To: Ubuntu-AU <ubuntu-au@lists.ubuntu.com> Message-ID: <1265960618.2430.34.ca...@geoffrey-desktop> Content-Type: text/plain; charset="UTF-8" Recently I built and tested a home-made antenna for the wireless broadband modem given to me by Telstra Bigpond (Maxon BP3-EXT). The Bigpond software indicates signal level with five vertical bars. Using the modem antennas (there are two, a primary and a secondary) signal level was usually 3 bars,sometimes 2 (<3 is poor). With the new antenna (fitted in place of the modem's primary antenna) level is always at the maximum of 5. The higher signal level should give fewer packet errors and therefore faster overall data transfer. The antenna consists of two quad (full-wave) loops made from cupper wire each connected in parallel and mounted above an aluminium reflector plate. A soldering iron is needed to fabricated the wire and to connect coaxial cable. The design frequency was about 850 MHz based on the quarter wave antennas used by the modem. Because of the reflector the quad dimensions are smaller than those calculated for free-space conditions. The actual dimensions were arrived at by testing with an RF Vector Network Analyser (VNA)and the distance to the reflector adjusted for best SWR (1.3). The impedance of the antennas was close to 50 ohm. The antenna was connected to the modem via a metre of 50 ohm high-quality coax suitable for the modem's SMA connector. This antenna is not a new design. I have seen one made using two diamond quads. My antenna is two square quads; equally good and simpler to make. Email me if you are interested in looking at a drawing of the design and a picture. I have drawings as .odg and .xsf files. If required I could send a .jpg file. ------------------------------ -- ubuntu-au mailing list ubuntu-au@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-au End of ubuntu-au Digest, Vol 48, Issue 11 ***************************************** -- ubuntu-au mailing list ubuntu-au@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-au
