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thanks, that's good. But with TRL in waveguide you only need a thru (direction connection of waveguide ends), a reflect, and λ/4 line, then why do you need the λ/8 and 3λ/8 waveguide sections? I'm guessing this might be for a LRL calibration ie λ/8 line, reflect, 3λ/8 line. If that is the case, then why would you need a LRL calibration, if you already have a TRL calibration. There must be a good reason for having all three (λ/8, ?λ/4, 3λ/8 waveguide sections) as you see these being sold together, i'm just wonding how you make best use of these/

many thanks, Neil