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Key to the spur free dynamic range is balance, low noise and high current in the cell to avoid distortion. That is why the AD831 runs so hot compared to the NE602 and IAM81008. There is a nice article

Christian: Thanks indeed , I already found it and did read it with much Interest, it lead me to using ADIsymRF and that really made me understand the spec points and how to select components.

Erik: You might want to review the Kai Rohm's presentation on the 3 GHz Signal Analyzer ( https://indico.desy.de/indico/event/15974/session/5/contribution/42/material/slides/0.pdf )?for a good

Thomas: This technique looks interesting. Would you mind sharing a source with details? Thanks. Christian W. HK4QWC ( https://qrz.com/db/hk4qwc )

Jim, ? Thank you for your suggestion. The next time I refer to a device, I can include links to the manufacturer and to a first tier supplier (if it is an active part). If it is an obsolete device, I

I use a lot of SA612’s in my designs. They are fantastic. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Moderator – QRO Group at Groups.IO. email:

This time it worked. Thanks!

Ok now?

Try uploading again, I just changed some group permissions.

I built the discrete component version of the Gilbert cell mixer described in EMRFD (figure 5-28).? It's in the front-end of a home-brew direct-conversion transceiver I made for 20 meters.? It

Are file uploads getting moderated? I just checked, and the files section is completely empty.

I uploaded the HW design document for the SimpleVNA to a similar named folder in the upload section of the group. The description includes a link to github for the PC and Arduino SW Have fun with the

Thomas, Thanks again! To test I removed the amplifier after the first mixer to get 9dB attenuation. Results are the same so I am happy. W.r.t the level 7 mixers. I did not know the importance of IP3

1:1 on the vinegar to hydrogen peroxide.? The table salt is kind of trial and error, you want enough so you see bubbles coming off the copper.? With 120ml of solution this equates to the extremely

Doug, Congratulations on making your homebrew pcb. I have not used the vinegar-hydrogen peroxide-salt etchant yet. What are the proportions you used for the etching solution? Al, N8WQ

I decided to use this little circuit as a chance to learn how to make PCB's.? The first picture of the transfer and drilling is not the one I actually used.? I got the process down better but didn't

Erik, If you are investigating the first mixer, it would need variable attenuator after that (tack it in, its temporary) to be sure that you are testing the IMD of that mixer, and not the chain behind

Thomas. Thanks for the excellent feedback. I am still learning. The mixer i am investigating is the first mixer of the SA. I have a step attenuator before that mixer to indeed check if the IMD is

When using a spectrum analyzer to measure intercept point, it is important to use a step attenuator between the DUT and the SA. This way, you can isolate if the Intermodulation products are generated

The root cause for the mismatch in ip3 turned out to be a wrong distribution of IF gain over the total chain. This reduced the 1dB compression point so a input of -10dBm resulted in -13dBM. After