Re: Searching for IMD

Ashhar Farhan
 

The article does mention the oip3 which is a measure of IMD. The crucial thing is bias current and feedback. The biasing method itself is irrelevant.
- f

On Sat, 15 Sep 2018, 04:21 Glenn, <glennp@...> wrote:
Perhaps it's possible to improve the Bi-Amps?   The article by Wes Hayward and Bob Kopski shows a slightly different biasing arrangement and feedback in the first stage compared to that used in uBITX. As shown, gain is 15dB and flat to 100MHz within 1dB.

More conventional resistive voltage divider is used and the feedback is AC only. Two extra parts are used. The article doesn't mention IMD though specifically, as a performance target or measure it.

glenn

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