Mike 1.6Mhz is the standard split on 70cm, so we have a standard set of cavities for that (yes, they are lossy...)
We can move to a 7.6Mhz split, but that moves my voice frequencies to 438.525 RX and 430.925 TX, even closer to D-Star TX and RX ! We only have one antenna - actually, we only have one flag-pole (it's a hollow fibre-glass flagpole on the top of a church steeple - commercial sites are no longer available in the UK due to the high costs). As regards a Hybrid Combiner, I need some help understanding this please ! Thanks David - G4ULF --- In Repeater-Builder@yahoogroups.com, "Mike Mullarkey" <[EMAIL PROTECTED]> wrote: > > 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: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of dlake02 > Sent: Saturday, November 15, 2008 10:04 AM > To: Repeater-Builder@yahoogroups.com > 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 >
