The DXE NCC-1 and NCC-2 are well equipped to deal with this. I haven't measured noise, but I did carefully measure phase shift and gain for multiple settings. They're in http://k9yc.com/VE3DO.pdf

73, Jim K9YC

On 3/14/2020 11:54 AM, Michael Tope wrote:
Another pitfall that you have to be careful to avoid with the MFJ-1026 is making sure the level of the QRN you are trying null that is coming out of the sense antenna isn't much lower in amplitude than what is coming out of the main TX antenna

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