At 12/19/2008 16:07, you wrote: >On Thu, 18 Dec 2008, kb5vjy wrote: > > 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).. > > > 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.
OK. > 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. Potential problem: APRS digi on 144.39 TXing at same location as the 147.855 RX. Fortunately you have a lot of freq. spread to work with, so pass cavities on each may be enough to keep the APRS TX out of the repeater RX. Bob NO6B
