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trigger selective in frecuency

Question asked by conchiupct on Nov 20, 2008
Latest reply on Nov 27, 2008 by conchiupct

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I want to acquire a signal with 200MHz of bandwidth, centered at 3,5 GHz. If I leave the scope in a single-shot mode, may be the scope will trigger with any signal in all its bandwidth but I want that it waits until a signal centered at 3,5 GHz.

My question is...is it possible to do some kind of filtering in the trigger or a kind of selection in frecuency before the scope starts to acquire the signal?

Thank you everybody.

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Frank_BR Nov 21, 2008 3:38 AM
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Hi,

You can use, for example, the channel A to see the signal and the channel B with a band-pass filter as the source of trigger. An appropriate filter for your purpose could be the Mini-circuits VBFZ-3590+:

http://www.minicircuits.com/pdfs/VBFZ-3590+.pdf
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marowley Nov 21, 2008 1:45 PM
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Hello

There really is not a way to use a scope triggering capability to trap a modulated frequency inside a CW. This is a very hard thing to pull off. Agilent Technologies does have a very wide variety of products designed to measure spectral contents of many types or RF signals. It may be extremely helpful for us to provide an answer for you if we knew more about what you are trying to measure or observe.

Thank you
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conchiupct Nov 26, 2008 3:39 AM
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We are trying to capture a UWB signal of 200MHz of bandwidth.

Would it be possible with the InfiniiScan extension?
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marowley Nov 26, 2008 7:31 AM
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Hi,

Well originally I thought the InfiniiScan just might work. So I tried to setup a CW 3.5GHz with a 2MHz modulation(limit of the Pulse Generator) and tested this. I was not able to trigger using InfiniiScan. I had much better success to observe the 2MHz modulation by decreasing the sampling rate to 4-5MSa/s and this provided a band pass filter to only see the 2MHz sign wave. Triggering is another matter. In the RF world it is not always important to trigger, because most of the signals are observed in the frequency domain not the time.
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conchiupct Nov 27, 2008 1:12 AM
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Hi!

What we want to do is to be able to acquire only the uwb signal instead of all the signals that are in the environment at all the frecuencies (from other wireless devices).

On the other hand, what kind of trigger did you use with Infiniiscan? Zone Qualify? From Agilent Spain advised us to use this function but I saw the Infiniiscan video in the Agilent's web and I didnÂ´t understand how to do it in time domain where all the signals are mixed.

Thanks
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trigger selective in frecuency

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