The trouble with long attenuator chains is that each has a tolerance that add ups and will vary with frequency
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if you have a good VNA you can measure the thing and note the attenuation at fundamental and each harmonic frequency but it¡¯s not as easy as LEGO?
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A good high power 40dB attenuator is a good investment then one more standard 2W will usually do the trick?
Bruce Akhurst