In a message dated 4/19/2007 5:42:12 P.M. Pacific Daylight Time, [EMAIL PROTECTED] writes:
Hello Doug, my opinions and experimentations about Yagi cellular antenna are: 1- Very difficult to tune with spectrum analyser or bird, affected by hand effect. 2- Need a good heliax between radio and antenna. 3- Sometimes an omni 3dB is better than a Yagi. 4- Sometimes Yagi 7el. and more are really sharp in radiation pattern and difficult to align. I utilize a cellular repeater with a 15db gain yagi: 2. For runs up to 50 feet, LMR-400 will do fine. For runs less than 25 feet, Rg-213 works OK. 3. Why would you ever want a low gain omni antenna when you're struggling to snag enough signal to operate a cell phone? The site you are looking for is, by and large, going to be low level, not up on a mountain top. 4. Yes, high gain yagis are indeed sharp in radiation pattern but that's a plus, not a minus. It helps the cell phone capture and stick with one cell site rather than running searches. What is the difficulty in aligning the antenna? Assuming you have a cell phone with an external antenna port, you glue the yagi to it and make incremental azimuth changes until you peak the signal. Although they don't advertise it, many cell phones have a maintenance and service screen that will show you the actual -db level of the signal and the channel you are acquiring. ************************************** See what's free at http://www.aol.com.
