Steve, The coaxial colinear is my favorite home made repeater antenna. I usually try and find a bad commercial antenna and suck the insides out and replace with insides cut to ham frequency. I do not use RG-58 as this article references, I will typically use RG-8 that does not have foam type center insulation. I recommend the use of double wall heat shrink tubing around the joints for more strength.
http://www.rason.org/Projects/collant/collant.htm The antenna design is also very well detailed in the ARRL Repeater Handbook that was first published in the early 1970's. I have been involved in building several of these for 2 Meter repeaters and am presently in the process of building one for 222 MHz that will go inside a Stationmaster shell that was originally made for 170 MHz. 73, and good luck. Joe - WA7JAW --- In [email protected], "Dr. Stephen Andrew Wilson" <[EMAIL PROTECTED]> wrote: > > Dear Friends: > > Our club (Radio Club Querétaro, XE1RCQ)is in the process of putting > together a UHF repeater for our authorized frequency of 438.150. At > the moment we only have a Ringo-type antenna, and are looking for > ideas for more efficient home-made antennas for this purpose. I tried > several Google searches, and only came up with a few trillion > commercial UHF antennas. > > Our system at the moment is quite simple, and consists of two Motorola > GM300 radios, with a Celwave duplexer. > > Thanks in advance for your kind assistance. > > Steve, XE1UFO, RCQ president > Santiago de Querétaro, Mexico >
