Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
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It has been reported many times that while s-9 is? suppose to be a 50 uV signal and the S unit is 6 db, almost no receiver of the ham grade will ever meet both if any of those numbers.? I have a couple of service monitors? and can say by actual measurment on about a dozen different ham sets not one of them met both.? Especially the 6 db per s unit.
It is often helpful to put 6 db pads on the test equipment to help keep the impedance constant.? Even my original cost $ 50,000 HP 8924C service monitor recommends that for some measurements.? ?
de ku4pt
On Sun, Aug 26, 2018 at 6:32 PM Tom, wb6b < wb6b@...> wrote: According to this guy an S unit should be 6 DB. However, I would believe your attenuator pads over any absolute S meter readings. Because you are using a series of attenuators, if the receiver input impedance is for some reason not 50 ohms, that should come out in the wash and not be a factor.
There are many people that know a lot more about the practical aspects of making these measurements than me, but it looks like your analysis is correct.?
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