Gary (KD9SV) kindly loaned me one of his 994 x5 preamps (sometimes called KD9SV VLN (very low noise) preamp) so I could compare its Noise Figure against one of my W1FB preamps as well as 2 of my W7IU
Hi Don Measuring noise figure below 1 db is a very complicated work. First you need to remove all common mode noise, your noise floor should be better than -135 dBm at least with a 40 db preamp conne
Hi JC, I did not publish any absolute Noise Figure values, my measurements that I published are all just differences in Noise Figure. It actually is much easier to measure the difference in Noise Fig
Don, Thanks for sharing your research on the preamps. Very informative. Your study is very timely for me. I have ordered DX Engineerings new phasing box, NCC-2. Optional plug in preamps are available