David,
I would say this could be easy but since you have you have a 1.6Mhz split on the Voice repeater it will be tough with one antenna. You are going to have to use ¾ wave cavities for the transmit combiner and a lot of loss. I could not this working out unless you have a hybrid combiner and other items. If you can add another antenna it is a slam dunk as long as you have 30ft of separation between the TX & RX Antennas. Mike K7PFJ _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of dlake02 Sent: Saturday, November 15, 2008 10:04 AM To: [email protected] Subject: [Repeater-Builder] Two UHF Repeaters - one antenna Hello I need some advice - I've searched the group and can't find an answer, so I call on the collected wisdom here, but apologise in advance for taking your time. I have a repeater site that has a single antenna, VHF and UHF. Now, combining the VHF and UHF is fine, although lossy. But, we want to add D-Star at 70cm, which means that I will have two UHF repeaters, two sets of cavities. How do I combine the output of the two cavities prior to feeding to the VHF/UHF combiner ? My frequencies are close: D-Star TX 439.6125 FM RX 434.650 FM TX 433.050 D-Star RX 430.6125 Do I just couple to another T-piece ? Are the cable lengths critical ? Has anyone got experience of doing this ? Thanks in advance for your assistance. David - G4ULF
