[time-nuts] Ebay FE-5680A Rb: Are they that good?

Marco IK1ODO -2 ik1odo at spin-it.com
Fri Dec 9 12:54:22 EST 2011

At 18:23 09-12-11, Javier wrote:

>I think that the low-band preselector (I don't remember the model) 
>was more oriented to increase the dynamic range for EMC testing, 
>rather than due to a crappy harmonic response of the analyzer. It 
>also includes a preamplifier.

Correct. 85685A, a very expensive (then and now) piece. The problem 
there was to limit the impulse bandwidth of the frontend, harmonic 
response was not a concern.
In general, if you want to reliably measure harmonics with a S/A, you 
have to cancel the fundamental, either with a notch or low pass filter.

73 - Marco IK1ODO

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