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. The best product I think is made by Sinclair or Comprod, the big problem with these products (VERY EXPENSIVE) but its the best solution. Try with a low cost system before, if you can, to see result and grow up if you need best performance. 73 Eric VE2VXT _____ De : [email protected] [mailto:[EMAIL PROTECTED] De la part de Davies, Doug A FOR:EX Envoyé : 19 avril, 2007 14:06 À : Repeater-Builder Objet : [Repeater-Builder] OT: Cell Phone Yagi I know this is off topic, but I also know there is a wealth of knowledge here. I need to install an outside antenna to ensure continuous cell phone access from my home QTH. The commercial 7-element Yagi is over $100. I know I can make one cheaper than that out of 1/8" dia. aluminum tubing or welding rod. I just don't know what would be the best way to feed it. It would be great to use the feed system seen in Sinclair antennas i.e the folded dipole with the feed line going through the inside of the tubing but I don't know if coax that small is available in the odd impedence required to match the antenna properly to 50 ohm coax . There are other methods like the Delta match, Gamma match etc. but all of these require the feed point to be exposed to the weather. Has anyone tried to build one of these? Please share your experiences. Doug VE7DRF
