I have owned an 820, 530, 830 and now an 850. While the 850's noise blanker is not a patch on the 830's (haven't done the mod yet) it has similar small signal performance. The 850 has performed remarkably well and I cant see my self upgrading to anything else. 73's Tim -- Tim.Tuck at penrith.net, VK2XTT at penrith.net VK2XTT :: QF56if :: BMARC :: AMSAT#35732