_____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Dave VanHorn Sent: Friday, January 26, 2007 3:21 PM To: [email protected] Subject: [Repeater-Builder] Re: 2 meter repeater --- In Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> yahoogroups.com, "IF YOUR NICE I MAY TELL YOU" <[EMAIL PROTECTED]> wrote: > > Hi all another question do you need 1 0r 2 antenna's on a repeater. > Thanks > Yes! You can do it either way, but MOST systems use one antenna and a rather expensive device called a "duplexer" which separates the transmit and receive into two separate feedlines. Dual antennas can be done, but you need a lot of physical separation to make that work. It is usually cheaper to use one antenna. If you use 2 antennas you will usually also need some cavities in both the receiver and transmitter lines to get enough isolation. A duplexer may be a little more cost than a couple of cavities but then there is also the cost of the second antenna and feed line. 73 Gary K4FMX
