Milla: If you are using a single antenna at each end (a combined TX&RX configuration) then the paths follow the reciprocity principal - the near-end transmit signal *will* take the same path as the signal received from the far end - exactly. So your 13 dB difference would be better explained by either (1) equipment malfunction or degradation [weak TX or deaf RX], or (2) the RX signal sensing circuits in the receiver are badly misaligned and giving you a bogus.
Now, another possibility would be that there is a strong local signal near the weaker receiver - somewhere near the 2.4 GHz band - strong enough to degrade the receiver (even if it at 1.9 to 2.8 GHz, for example). Any 1.9 GHz PCS cell sites nearby? Maybe somebody else has experience with the 802.11b receiver performance in high RF environments.... Greg -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David Young Sent: Sunday, January 19, 2003 19:37 To: [EMAIL PROTECTED] Subject: Re: [BAWUG] Assymetric Rx power, why Milla, It is possible that the first site's emissions take a different path than the second's, e.g., ----> S1 __________________________________ Y \ \ \ \ \ \ \ \ \ \ \_________________________________\ S2 X <---- At S1 and S2 are your stations. At X and Y are radio reflectors such as buildings. Say that the S2->S1 path is the weak one. It could be a much longer path than the S1->S2 path, or it could cross radio attenuators like trees. Or X might be a worse reflector than Y. Diffraction and refraction will enter into the picture. If you cannot explain the problem by path differences, you might try swapping the cable and antenna at the first site with the second. Dave On Sun, Jan 19, 2003 at 06:38:00PM -0800, Milla Yegurku wrote: > hi > > my PTP link has simillar radio, cable, antennae at > both ends -i am getting -49dBm at one end and only -62 > at the other. where is the difference of 13db gone? > what are the possible reasons? > the link is set up in urban environment with very poor > LOS. > > regards > Mila > > > __________________________________________________ > Do you Yahoo!? > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > http://mailplus.yahoo.com > -- > general wireless list, a bawug thing <http://www.bawug.org/> > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- David Young OJC Technologies [EMAIL PROTECTED] Engineering from the Right Brain Urbana, IL * (217) 278-3933 -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
