If we assume that both antennas are identical and mounted inline and directly one above the other, and assuming a receiver sensitivity of 0.25 uV, a vertical spacing of 39 feet should provide sufficient isolation between RX and TX. This assumes solid-shield RX feedline, such as Heliax, with the RX antenna at the top. Obviously, more separation is better.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Aisen Lopez Sent: Sunday, May 31, 2009 6:16 PM To: [email protected] Subject: [Repeater-Builder] Antenna separation for UHF repeater operation Hello: I realize this question must be "old boring stuff" nonetheless I will ask it. I'm planning on installing a GMRS repeater and I would like to use two antennas instead of a Duplexer/Antenna combination. What would be a good separation distance for a standard Split of 5 MHz, two 5 dB antennas and 35 Watts of power?. Thanks in advance..
