Generate signal at 1GHz frequency with 10MHz bandwidth

Hi All,

I have a very simple requirement: I want to generate some random signal with 10MHz bandwidth, at the center frequency of 1GHz. How can I make this?

1)

When I use "band PASS filter":

[noise source]---[band PASS filter]---[qt gui frequency sink]

The picture looks like a band REJECT filter.

When I use "band REJECT filter":

[noise source]---[band REJECT filter]---[QT GUI frequency sink]

The picture looks like a PASS reject filter.

I don't know what happened.

2)

And I cannot make noise at centre frequency 1GHz.

The filter block warns me: firdes checked failed: 0 < fa <= sampling_freq/2.

But if I want to make the center freq at 1GHz, isn't it the sampling_freq should be 2GHz?! 

It seems to me that it is an too high (impossible) sampling_freq.

Thanks and look forward to your help!

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Best Regards,

Grandha Woodsend

Radio Learner Interest Group