At 2/5/2007 19:51, you wrote:
>As another note in the article it suggested using a spectrum analyzer to >tune the receiver s local oscillator chain for lowest noise. While that is >one approach, an easier and probably more accurate way of doing it is to >use a sinadder on the receiver while tuning it up. Tuning everything for >best sinadd will result in best signal to noise performance of the >receiver which would also include lowest noise out of the local oscillator >chain. Yes, but there is another major consideration when talking about repeater receivers (& this is the "Repeater-Builder" list): dynamic range. Tuning the LO for best SINAD gives you best sensitivity, but if the LO has significant spurious content, that will translate into spurious responses in the receiver. The LO tuning instructions for the G.E. MVP/Exec II/Mastr II RXs do not take SINAD into consideration except for the final step, where you're allowed to make only minor tweaks to the LO tuning. This is probably to assure that the LO stays clean. Bob NO6B
