At 8/22/2009 07:49, you wrote:
>Let's never forget that ANY loss between the antenna and the receiver will >degrade the rx's noise figure. That means feedline, duplexer, cavities, >connectors, Polyphasers, etc. In theory, yes. However, if the noise floor (antenna noise temperature) is much higher than the noise temperature/figure of the receiver, then some loss between the antenna & receiver will have a negligible affect on overall system sensitivity. This is often the case at 6 meters, & sometimes even on 2 meters depending on location & receiver sensitivity. At higher frequencies the antenna noise temperature is usually much lower than 300 K, so in those cases yes you want to minimize all loss between the antenna & RX. Bob NO6B
