On Thu, 21 May 2009, atms169 wrote: > Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the preamp > 18 dB, so I'm losing 8 dB ??
Assuming you're not experiencing front-end overload because of your pre-amp. > The sensitivity I believe is 0.4 uV Dstar system. > > I live in Texas where it's flat. I'm adjusting my station to > compensate for the height value. More power good receive. There is a > 1000 foot commercial tower here which would have been perfect, but > they want too much to let me use it. Yeah, they tend to charge quite a bit to get to the top of a 1kft tower. > I had thought of adding two more cans and purchasing a new phasing > harness but, someone told me to stop and just add more filters. > > So I'm not sure which direction to go. > > I would like to push more power if possible. Transmit power does not equal recieve capability. You have to think bi-directionally. If you have a 6dBd antenna, and a mobile has a 3dBd antenna (unlikely these days), then transmitting 5W is equivalent to the mobile transmitting 10W. However, reciever sensitivity plays an important part as well. If you can't hear a station who is running 50W into a 3dBd antenna, he likely is not in a position to hear your repeater at 25W into a 6dBd antenna. Again, take out the pre-amp, insert a silver-plated teflon barrell. -- Kris Kirby, KE4AHR Disinformation Analyst
