John, Okay, we have established that an offset dipole antenna is appropriate. Such antennas have nearly an ideal cardioid pattern. My choice would be the Andrew (Decibel Products) DB222 dual dipole antenna, set for offset pattern. The Sinclair SRL-222 is another option.
When you have the opportunity, please provide more details about the radio and the duplexer, such as make, model, size, etc. What preamp is going to be used? 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of John Poindexter Sent: Monday, May 25, 2009 5:40 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Hello new member here w/question Well Eric those were some great questions you asked. Can I answer all of them, probably not. The radio is a Motorola, the cans will be 3 on receive side and 3 on transmit side and a Pass/Reject band can before the pre-amp. I believe the output power will be 70 watts. The ham building it is very experienced as he owns multiple repeater systems now. The antenna he shows up was a 4 bay antenna. We need coverage to the south, south-east and south-west from the location of the repeater. We are not to worried about the north as the county ends ten miles north. WE are just wanting to be able to cover the county for emergency use. I have been a ham for 30 years, but am new to the repeater business. This is why I am researching and checking into different sites on repeaters. Ran across this one today and signed up. Thanks again for the help. 73 John, W3ML --- In Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> , "Eric Lemmon" <wb6...@...> wrote: > > John, > > Welcome to the group! > > Please advise what make and model duplexer you have, and what is the > arrangement of the seven cans? What make and model are the radios? > > The antenna you select should be based more upon the repeater numbers (power > output, receive sensitivity, and desired coverage area) than by the > available tower mounting space. For example, if your repeater location is > off to one side of the desired coverage area, then an omnidirectional > antenna is not the best choice. Given that you expect countywide coverage > from a relatively small tower, your expectations may reflect some > significant optimism. Indeed, it may be prudent to examine the desired > coverage area closely to determine what antenna pattern will perform the > best, and choose the antenna accordingly. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of John Poindexter > Sent: Monday, May 25, 2009 3:32 PM > To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > Subject: [Repeater-Builder] Hello new member here w/question > > > > Hello, > > We are just getting into the repeater business for our club. We will run a 2 > meter repeater, with seven cans. > > My questions is what would be a good antenna if we don't have the space to > put a 4 bay antenna? > > The tower that we are starting with is only 50 feet with a 10 mast. > > Any ideas? > > This repeater is just for covering our county (a small county at that), we > are not worrying about other counties hitting it. > > Thanks and 73 > John, W3ML > Knox, IN >
