Why we use 50MHz as a reference?

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Hi,

Why in measuring RF power, a commonly used reference is 50MHz? Why not 100MHz or 60MHz or 55MHz?

Thanks.
 

this is the HP's hobby and now it became a standard
 

It is related to efficiency of the RF system.

For 50Ohm, it is balance the power efficiency in RF circuit and radiation efficiency in antenna.
 

see topic on .

BR
 

Thanks for the replies, but I think the question is why 50MHz instead of why 50 Ohms.
 

in architecture such as integer-n fhss (i.e. bluetooth), Fref must be equal to channel spacing (i.e. 1MHz), right?

(how) does this requirement differ for fractional n Σ-Δ?
 

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