Andrew, What sort of landscape are you doing your 3km link over? Is is flat fields, city landscape, trees???
David ----- Original Message ----- From: "Andrew Watkins" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 25, 2003 12:41 AM Subject: RE: [smartBridges] RSSI and LQ > Seeni, Nish and Marlon, > > Thanks for the replies... > > With the aPPT and aBT, the dial-a-power tab is disabled when in ETSI, so > looking at the figures below, I'm 5db (or 25%) down before I start so > getting the Total products (as recommended by my supplier) for a link of 3km > here in the UK wasn't a good choice! > > With the aPPO can anyone recommend a suitable antenna to ensure I get > 5.5Mbps? Would a aPPO and 9db MobileMark corner reflector at both ends be > up to it? The MM antenna have a 75deg horiz b/w so would an antenna with a > narrower beam width do the job? There are some power lines between the two > sites but apart from that it is CLOS. > > By the way, the tool to calculate the wireless link sets any Total product > to a 13db gain antenna - not taking into account us poor souls in the ETSI > region :-( > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Seeni Mohamed > Sent: 24 August 2003 17:01 > To: [EMAIL PROTECTED] > Subject: RE: [smartBridges] RSSI and LQ > > > Hi Andy Watkins, > > As per ETSI standard(UK) the maximum EIRP power is about 20dbm which is > equal to 100mW (Effective Isotropic Radiated Power - Power transmitted > from the antenna). > For the 3 KM distance, you will be able to get about 1Mbps speed rate > (aPPT and aBT using 9db antenna internally) and this is subject to the > noise, interference and environmental etc... The LQ values are > fluctuating means that there should be some interference or noise in the > wireless signal. Please try one by one channel to get better non > overlapping frequency. Or use any wireless network tool(sniffer or > airopeek) to find out the better non interference channel. > > The maximum output power calculated as follows: > Device produces output power is about 11 dbm and antenna gain is about > 9db = 20dbm(100mW) > Fade margin calculated as = 5 (assuming loss due to environment like > moisture, rain etc.) Below values are approximately as estimated values > and this may varies due to noise, interference or if the fade margin > increases. > > At 1 to 1.5 km distance = 11, 5.5, 2 and 1 (Mbps) > 2 km distance = 5.5, 2, and 1 (Mbps) > 2.5 Km distance = 2, 1 (Mbps) > 3 Km distance = 1 (Mbps) > > Please use the following tool to calculate the wireless link. > http://www.smartbridges.com/showcase/link.php > > Thank you > > Seeni, SB support > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Watkins > Sent: Sunday, August 24, 2003 5:35 PM > To: '[EMAIL PROTECTED]' > Subject: [smartBridges] RSSI and LQ > > I have been running some tests at ranges between .5km and 3km > > At .5km the RSSI stays consistent at 100% and LQ is 98%. > At 3km the RSSI stays consistent at 40% but LQ fluctuates between 0% and > 70%. > > I am using the following: > aPPOTotal ----> aBOTotal > aPPOTotal ----> aPPO c/w 9db MobileMark corner reflector > > As I am in the UK, the internal antenna on the Totals is 9db > > Any comments on why the LQ is so erratic? > > Thanks > > Andy Watkins > > The PART-15.ORG smartBridges Discussion List > To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe > smartBridges <yournickname> > To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe > smartBridges) > Archives: http://archives.part-15.org > > The PART-15.ORG smartBridges Discussion List > To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe > smartBridges <yournickname> > To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe > smartBridges) > Archives: http://archives.part-15.org > > The PART-15.ORG smartBridges Discussion List > To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> > To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) > Archives: http://archives.part-15.org > The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org
