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Hello ,I have a very weird phenomena my YIG has a tune input.

When I used LD1084 regulator and one of the resistors was a trimmer even thow i put 10uF capacitors on the output and input .

When i try to tune my voltage going into the YIG the YIG starting to jumps 300MHZ 500MHZ back and forth.

So i suspect the TUNE voltage have jumps of 1V at least.

I suspect that when I changed the trimmer  value it created  this behavior.

A basic voltage divider get my YIG better stability then this thing.

1.Am i correct in my assumption?

2. Why the trimmer could create such a thing?

3.what could be manual tuning alternative for changing of resistor?

[URL unfurl="true"]https://www.st.com/resource/en/datasheet/ld1084.pdf[/URL]

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