they have made them in the past DB John
----- Original Message ----- From: n3dab To: [email protected] Sent: Thursday, October 23, 2008 8:06 PM Subject: [Repeater-Builder] DB antenna question I'm running out of antenna mounting positions at my site. Has anyone tried any of the following ideas and if so what were the results ? The intent here is to run 2 rptrs. using a common mast to support 2 antennas. 1. Mounting the dipoles and harness from a UHF DB420 on the same mast as a VHF DB224, or vice versa. (UHF and VHF antennas on the same mast) 2. Mounting the dipoles and harness from a DB420 on the same mast of an existing DB420.(2-DB420 UHF antennas on the same mast) 3. Taking an existing DB420 antenna and feeding the upper and lower halves with separate feedlines to make 2-6 Db antennas on the same mast. The lower harness section would be replaced with with the upper harness section from a junk antenna. In 1. and 2. the dipoles of each antenna would be at right angles to the existing antenna. In 3. the overall gain of the single antenna would be reduced to about 6 Db for the upper and lower halves. Additionally extra filter cavities would probably be required to keep the 2 rptrs. using the antennas from interfering with each other. If any of the above ideas are practical this would allow me to recoup some additonal mounting positions or at the least reduce the clutter of antennas I have now. All constructive comments will be appreciated. Doug N3DAB/WPRX486/WPJL709
