I'd go with 50 to 100 kHz spacing from the analog channel and use circulators for the transmitters and a spliter to allow operation through the existing antenna and duplexer system, Like IBOC.
On 4/1/08, johnmichaelwelton <[EMAIL PROTECTED]> wrote: > We are investigating the possibility of adding 2M/440 DSTAR. At the > university, we currently have the following analog repeaters at ~175 > ft HAAT (in/out): > > 144.850 - 145.450 > 449.825 - 444.825 > > We will have access to the roof of the new hospital (about the same > HAAT), about 1 mile away and would like to add a separate DSTAR suite > without interfering with the existing analog site. SERA has 3 freq > band options for VHF DSTAR for example (in/out): > > 144.800 - 145.400 (600 KHz split) > 146.480 - 145.080 (1.4 MHz split) > 147.460 - 144.960 (2.5 MHz split) > > UHF for DSTAR generally follows the analog band plans, e.g. 442-444 > out, +5 MHz in and DSTAR pairs are interspaced with the analog pairs, > e.g. 449.9875 - 444.9875. > > Could anyone recommend a strategy to pick new 2M and 440 DSTAR pairs > that would provide the least interference for the existing analog > repeaters above. > > Thanks > John/N4SJW > Charleston, SC > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
