At 4/16/2009 21:23, you wrote:
>Anybody have an idea of the noise to singal ratio for the GE Mastr II UHF >preamp? The one I measured a few years ago measured 4.6 dB NF. > I have heard they are quite noisy as compared with other preamps such as > the Advanced Research products. They are noisier, but the ARR & other GaAsFETs are very broadband & usually require some sort of pass filter in front of them. The UHS preamp has a coil that makes it considerably narrower. I recommend the Angle Linear GaAsFET preamps (http://anglelinear.com) because they are unconditionally stable, meaning they will not oscillate regardless of input & output impedances presented to the preamp. ARR makes no such claim AFAIK. Bob NO6B
