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After hours of going at it. I have come to this point. I think it looks alot better, but still probably can be improved. 2 things. I can't set the nvna for more than 1024 points and the point rbw seems to unable to be changed from the 4000 hz setting. If someone knows how to change the rbw in nanovna app, immall ears. other points in the previous post were followed. I also added a 3db pad to the generator port and calibrated the nvna with the pad inline. Now I have both high and low sides looking similar. This is the high side. What should the total s21 gain be for each side approx.? I can't seem to get it lower than -0.8xx on each side. The s21 gain on reject averages about -70. The jumpers I'm using to tune will be the same ones used for the final installation. They are 2.0 meter new old stock 1/4 inch hardline with N connectors that came from cellular service. The nvna has sma to N connectors. I will follow up this post with pics of my test configuration.

On Sun, Apr 27, 2025, 10:33?AM George Csahanin via <george=[email protected]> wrote:

I ditto that. Every 526 I have tuned was done by individually tuning each cavity as per the instructions (there's more than one version of that) and then re-connect and each has been right on the money. First one in the 80's was done with a Measurements signal generator and Yaesu 708 portable as the receiver. Zero desense even with a GaAs FET preamp though it had its own preselector.

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These are my preferred duplexers by far.?

GeorgeC W2DB