01-21-2009 03:12 PM
We have a signal generator (NI PXI 5610+5421) and a vector signal analyzer (NI PXI 5600+5620).
Now the highest bandwidth of the signal generator is 10MHz, and the highest sampling rate of the vector signal analyzer is 60MHz. How can we get higher bandwidth than 10MHz and higher sampling rate than 60MHz?
Thanks a lot.
01-22-2009 03:08 PM
01-22-2009 04:29 PM
Hi Jaime,
First, thank you for your fast reply.
We want to use the transmitter and vector analyzer (receiver) to measure wireless channel delay profile. So high bandwidth transmitted signal and high speed sampling receiver are needed.
As you said, with 5670, we can get transmitted signal bandwidth up to 20MHz; and with 5660, we cannot go higher than 60MS/s, right?
Thank you again,
WLPS
01-23-2009 11:27 AM
01-23-2009 01:16 PM
Hi Jaime,
Got your answer on the sampling rate and band width.
We have another problem, power.
When we use the system (vectro signal generator and analyzer) to measure outdoor channel, the transmitted power of the signal generator and the receiver sensitivity of the vector signal analyzer are not high enough. We have bought a PXI 5690 to get more gain (about 50dB), but in outdoor, we still cannot catch the reflected signals (small power). Do you have any idea to catch the reflected signals with small power? Or does NI have any other card to enhance the receiver performance?
Thanks a lot,
WLPS
01-26-2009 03:25 PM
01-26-2009 11:08 PM
Hi Jaime,
Thank you very much!
We will measure the signal level when we have a chance. There are too much snow outdoor now.
And we will consider your suggestions!
Best regard,
WLPS
02-06-2009 11:42 AM
Hi Jaime,
I just read the data sheets of the NI PXIe-5663 and 5673. But I did not find the sampling rate of the 5663, its instantaneous bandwidth is 50MHz, does that mean its sampling rate is 100MHz?
If we upgrade to the 6.6 GHz platfor, can we get 50MHz bandwidth signal transmitted at the NI PXIe-5673, and at NI PXIe-5663, we can get a 100MSps, and store the data at hard drive or on board memory?
Best regards,
WLPS
02-09-2009 11:30 AM
Hi WLPS,
Your are in the right track but some things are not right on your statements.
Let’s start with the 5663, you are correct by saying that it has a 50 MHz instantaneous
bandwidth but this does not relate to sampling rate, my guess is that you are following
Nyquist theorem for stating the the sampling rate at twice the bandwidth but when
you are dealing with bandpass signals the theorem changes a little bit. This
wiki article helped me refresh all those concepts I have not seen for a
while: http://en.wikipedia.org/wiki/Sampling_(signal_processing). The bandwidth, even
if you can sample at 1 GHz will still be limited by circuitry.
01-07-2010 09:40 PM
hello I need help
I am student of the Universidad de Sonora, I am working with the PXI 5600 + 5620 RF signal analizer.
But I have a problem, when introducing the ni5660 initialize.vi appears a window, and ask me to look the name of the VI "MT get attributes" among others.
For all the ni5660 palette occurs the same.
i hoop to answer me soon
thanks for your help.
I'm Alán González.
I'm studing Ing. Electronics in 9th semester.