I can vouch for this statement.. Our Club has set up a UHF rptr with 5M vertical separation using a Philips FM815 (40W) and dual feedlines (LDF4-50), the other feedline feeds the TX ant. The only filter is a small helical on the RX.
73 John VK4JKL On 31/10/2008 4:58:14 PM, jistabout ([EMAIL PROTECTED]) wrote: > Jsn, you can do just fine with two good antennas with good quality > feedline with as little as 10 feet of vertical separation at 5 mhz > frequency spacing. > > A quick look at the chart within the ARRL FM & Repeaters Handbook > shows that you can achieve 75db of isolation with just 20 feet of > vertical separation at 450mhz, more than enough for duplex operation. > > I personally have built UHF systems which use two antennas with close > spacing and they all show no significant desense and work just fine. > > 20-30
