We have a VHF TV station on top at 1500' and until recently had an FM broadcast station at 1200'. We had to run a notch filter tuned to the FM station to keep it out of the receiver.
Of course in recent years they added a big UHF slot antenna on the side of the tower for HDTV. We had to move our top antenna down to just above the FM antenna to get out of the way of the UHF antenna. That move cost us about $5k for the climb. We haven't been able to decide if the loss in height was offset by the reduction in feedline loss but it seems pretty close. John Lock kf0m at arrl.net > -----Original Message----- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com]on Behalf Of skipp025 > Sent: Friday, December 19, 2008 11:43 AM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Re: Yet Another split antenna Question > > > Hi John, > > Very Nice... > > You didn't indicate how much and what type of broadcast is > also on the tower? > > One of the saving grace items in your system is the quality of > the Master II Receiver and it's well designed front end. > > cheers, > s. > > > > "kf0m" <kf0m_l...@...> wrote: > > We were at 1400 ft and 1100 ft for a while with the repeater > > on the tower running 40 watts TX. That separation was OK for > > the Tx and Rx isolation. We ran one can on the RX. an HT > > could be full quieting at 50 miles from the repeater. > > > > The repeater was a Mstr II inside a surplus traffic light > > controller box. > > > > Unfortunately we lost access to the elevator and so we brought the > repeater > > to the bottom of the tower because of the climbing costs. Takes a > lot more > > watts and a good preamp and still doesn't equal the range > performance but it > > is a lot easier to work on especially in cold weather. > > > > With the repeater in the air, everything needs to be super rugged > with as > > much redundancy as you can manage and as modular for swapping parts > in and > > out as possible. It is absolutely no fun to try and work on anything at > > that height in the winter. > > > > > > John Lock > > kf0m at arrl.net > >
