Using an external attenuator is the preferred method with any RF generator.
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Some measure the output and use it as feedback to control the RF level, so that it is consistent over a large frequency range.
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This can be messed up when feeding highly reactive loads, so by adding an attenuator into the path, it helps ensure the generator always sees something close to 50 ohms, regardless of the actual load.
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Don't consider modifying the Ultra, you will just add a whole load of additional problems.
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Regards,
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Martin
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On Fri, Mar 21, 2025 at 10:24 AM, R. Maris wrote:
I'll order a 50 ohms BNC attenuator
