Just wondering if anyone has attempted to reproduce the tuning screw type polariser in the files section ? Looks interesting and achievable, without too much hassle :) Cheers Keith VK6KB/VK6EME

Hi all, Having looked at a few designs for LNA's I reckon it would be worth creating something based off of AN-MWO-LNA-XBND-2020.2.6.pdf in the files section. WG15 input, rather than WG16 so optimum frequency range would be 7.05 to 10 GHz. For the active device, the CE3512K2 looks excellent, documents at http://www.cel.com/parts.do?command=load&idRootPart=2599# ( http://www.cel.com/parts.do?command=load&idRootPart=2599 ) Spec: NF = 0.30 dB TYP., Ga = 13.7 dB typical @V DS = 2 V, I D = 10 mA, f = 12 GHz It may be possible to initially re-scale the wireframes from the AN-MWO-LNA-XBND-2020.2.6.pdf document from WG16 to WG15, but we probably need this simulating to ensure it will work. My guess would be to initially make a single stage to check the likely NF / gain, and if that works out, add a stripline BPF and a second stage etc. I like the idea of reduced height casing to avoid oscillations caused by waveguide modes, alsoo this removes the need to use bits of absorptive rubber which can contribute noise if incorrectly placed etc. From my perspective it would be great to have an optimised NF at 8425MHz, obviously with such a wide bandwidth design the NF +- a few hundred MHz will be excellent, and for local sources like LEO's its probably an overkill ;-) All ideas welcome! regards, Paul m0eyt.