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Harmonic measurements - RF Cafe Forums
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| jabb
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Post subject: Harmonic measurements
Posted: Tue Oct 03, 2006 11:26 pm
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Joined: Tue Apr 18, 2006
10:40 pm
Posts: 11 |
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hi...i've this spectrum analyzer that goes up to
26.5 GHz. my DUT runs at 18 GHz; if I want to check
the second (36 GHz) or third harmonic (54 GHz) can
that be done using the spectrum analyzer or because
since it goes up to 26.5 GHz, it won't sense the
signal at those harmonics?
is the only other
thing possible is to use mixer to down convert?
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RFTEJerry |
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Post subject:
Posted: Wed Oct 04, 2006 12:05 pm
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| Captain |
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Joined: Thu Apr 13, 2006
9:53 am
Posts: 17
Location: Florida
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Hello jabb,
Your spectrum analyzer will not
be able to measure your harmonics directly because
they are out of the tuning range of the spec-ana.
You will need to add an external down converter
between your signal and the spec-ana. Many spec-anas
can output their LO to external mixers to downconvert
the signal to the range of the spec-ana and then
compensate for the down conversion so you don't
have to do the math.
I have down this with
several HP (Agilent) spec-anas in my career. The
reason the spec-anas LO is used to keep everything
in "sync" with the internal sweep of the spec-ana.
Good luck,
RFTEjerry.
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Posted 11/12/2012
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