Hi, I would recommend that you do some research on the terms "dynamic range" and "front-end compression" as it relates to your particular hardware / radio platform. Understanding those terms / concepts will give you the understanding you need to make your "homebrew" system work
Otherwise, if you want to just "plug and pray" your network -- you're better off probably just buying quality name brand products that have enough built-in "safeties" to let one just mindlessly deploy -Charles P.S. -- although I happen to have an understanding of Rf theory, HAM stuff, and Radio engineering, when I ran my WISP, I found that in the long run, it made better business sense to subscribe to a "lazy" WISP "plug-and-pray" mentality due to the fact that I liked knowing that I could focus my core efforts on sales, marketing and customer service. From a deployment side, I could just put some stuff up and have the ability to blame all my system mishaps on my friendly manufacturer / vendor =) ------------------------------------------- WiNOG Austin, TX March 13-15, 2006 http://www.winog.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Moldashel Sent: Tuesday, January 17, 2006 6:25 PM To: WISPA General List Subject: Re: [WISPA] Multiple Radios on Single antenna Ahhhhh......Lets do some math....... Lets say the radio has a +20 dB output. For this example there is no line loss. The antenna is rated at 30dB x-pole isolation. Here we go... +20 dB -30dB xpole = -10 dB receive level. In my book that is high enough to kill any link of the same freq on the opposite polarity....No??? Add to that a radio that needs to Rx and Tx on and off and you should have receiver blocking....... -B- Matt Liotta wrote: > Depending on various factors, you should see at least 15db of > attenuation between polarizations on a dual-pol antenna. > Theoretically, you should see 20db. In any case, 15db is enough > attenuation even on the same channel to operate two links reliably. > > -Matt > > Jason Wallace wrote: > >> List, >> >> When antennas are separated by normal distances, they can only "see" >> each other electromagnetically (ie, radio waves). However, when they >> are close they will experience capacitive and inductive coupling. >> Dual pol antennas work fine when only receiving (as in those large >> satellite dishes from the 80's that used 90° pol changes between >> adjacent channels). I think you will always have trouble overloading >> the receiver when transmitting with this setup. > > > -- Bob Moldashel Lakeland Communications, Inc. Broadband Deployment Group 1350 Lincoln Avenue Holbrook, New York 11741 USA 800-479-9195 Toll Free US & Canada 631-585-5558 Fax 516-551-1131 Cell -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
