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Hi, I did make a similar polarizer, but based it mostly on scaling http://www15.plala.or.jp/ja6ahb/W2IMU%20DUAL%20MODE%20FEED%20HORN.pdf and: The Six Centimeter Feed Experiment Skip MacAulay,

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, found this during some digging https://tomrospa.wordpress.com/2017/12/16/simulating-transitions-with-waveguides/ - may be useful. regards, Paul M0EYT.

I recently purchased some MGF4937AM FETs. No time to play with their design parameters yet to see how they differ from the CEL FETs. As soon as my 8510C system starts giving some sound results I will

Hi Paul, Have made a start with it, but not had much time of late to be honest - work stuff getting in the way. Hopefully that'll settle down soon. I think a different fet will be required certainly

Morning all, I'll take a look for some additional FETs that will be a good match for our application. Robert - did you get any further with a reconstruction of the stepped transition design ? I was

Hi all, I agree with your assessments. Perhaps this is not the FET we are looking for - they seem to be clearly engineered with an application in mind. Maybe it's about time we go looking for one

Hi Stefan, Hi Job, I looked again at? the 10.2-10.5 GHz F1OPA design which uses NE3515S02 fets). In the band of interest (and even partially beyond it) the stability circles for both input side and

Hi Stefan, It could well be lack of my experience with ADS, but if I look at your ADS files, I do not see any modelling of vias, but in the eagle project I do see vias. These would typically help

Hi Paul, Personally, I'm not sure, no real feel for it yet - could almost make it worse by leading to feedback induced oscillation. I've had good experiences with Chomerics stuff, but agree if we can

Hi Stefan, Hi Kevin, Agreed. It does look tricky to get it unconditionally stable and stay in the low noise region. I'd not tried adding output side drain resistance but sounds like that doesn't

Hi Chaps, Great work so far, could these oscillations be damped by using a very reduced height metal cover over the input FET / RF path etc much like the F1OPA design.? I think ideally we want to

Hi Stefan, Robert, This amplifier seems very tough to tame in the region we want it. This is what I get when adding some small source inductance (2x 1nH parallel), and a drain stab resistor of 100

Hi Robert, Indeed that also matches what I saw while simulating. I did spend some time testing source inductance values back then, but concluded that any intentional inductance I placed wouldn't

Hi Folks,? Sadly not had much time to look at this lately. But can confirm experience of others - this FET really is on a knife edge. I added some degeneration source inductance to the bare FET in

Hi all, looks like we are making some progress here which is great. I did some research on the BIAS circuitry for the FETs. Someone suggested earlier that a ZABG4002 could be used. After doing

Hi Paul, I've started to look at this, but really only playing just to see if I understand the workflow. I did harbour an idea of using a slightly different transition - I used it as a learning

Morning Robert, This is excellent, thanks for running that. I did try to do the same in AWR but I probably need a week to learn the basics. I guess if we take your M2 figures above, the next step is

Hi, The part for the AWR plot is the CE3512K2 just the bare FET itself. ( /g/xbandlna/files/CE3512K2.pdf ) Regards, R.

Hi Robert, what is part number used in this simulation ? Télécharger Outlook pour Android<https://aka.ms/ghei36> ________________________________ Sent: Thursday, April 30, 2020 11:53:26 AM To: