Joe, I would use a 6-8" pass can on both the transmitter and receiver. That will give you plenty of isolation. On a large site, I would recommend using a circulator or isolator on the transmitter, just to be a good neighbor, and the VHF Mastr II PA's really like them also.
Add a Angle Linear preamp and that thing will be a pretty wild repeater. I would also use 1/4" or 3/8" superflex in the cabinet to cable everything with, even the preamp. Good Luck. Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, "kb5vjy" <jholl...@...> wrote: > > Folks, > > I have read just about every split antenna post that I can find.. I > hate to be a "yet another" poster but here is my situation. I just > want to know if it is do able. And what problems I might run into. > > After months of waiting, I have been issued a repeater pair of > 147.255 for a long range 2m repeater that will be installed. This is > my first 2m repeater, but I do have 3 70cm repeaters (all Mastr > II's).. > > My situation is the following: > > I have a Mastr II Station 100w Cont. Duty PA for the project... I > still have to order the xtals. I will run a PL as needed on 127.3. > The controller will be a CAT (version unsure of) > > I have a 2000' broadcast tower with a platform at 1300' and another > at 1000'. There is a DB 224 mounted under the 1300' and one under > the 1000' platform with a section of 7/8 feedline running from the > top platform and the bottom platform. There is a full rack size NEMA > 12 enclosure on the 1300' platform. After Feb '09 there will be NO > VHF transmitting equipment on this tower at all. The closest > transmitter is 6 miles away. > > What I would like to do, is mount the radio in the enclosure at the > top platform. Use the top DB 224 for the Receive antenna, and the > 1000' DB 224 for the Transmit antenna. What are the problems that I > will run into with this situation, and should I look for some type of > filter for the receiver. I do plan on putting an APRS Digi at 1300' > as well moving one of my 70cm repeaters to the same platform some > time early next year. > > Any comments would be helpful. Thanks.. > > 73 de Joe KB5VJY.... Sorry.. RTTY dayz! >
