Synchronise NI-RFSG / NI-RFSA with NI-TCLK

Is it possible to synchronise NI-RFGS and NI-RFSA devices using the NI-TCLK library?
I have a PXI system with a PXIe-5672 waveform generator / upconverter and a PXI-5661 downconverter / digitizer. I would like to synchronise them so they start transmitting / recording at the same time. I believe in general the NI-TCLK library can be used to achieve this?
I can't wok out how to use it. The "niTCLK configure for homogenous trigger" vi takes an array of "sessions", however I don't have "RFSA Get Session Reference" or "RFSG Get Session Reference" functions.
Is it possible to use the NI-TCLK library with RFSA and RFSG? If so, how do you configure it?
Thanks in advance
David
Labview 8.0 / Windows XP

I have attemtpted to synchronise transmitter and receiver using the TCLK library and the RFSG get Fgen session / RFSA get Scope session vi's. Both RFSA and RFSG have been initialised and have no start trigger set, and neither have been started. Their session references have been wired to a niTCLK configure for homogenous triggers vi.
However when I run TCLK synchronise or TCLK initiate I get the following erors.
Is it possible to use niTCLK with the digitiser in DDC mode? When I do not synchronise the RFSA (so only the RFSG is connected to the TCLK configure and initiate) I do not get the errors, but obviousy the RFSG is only synchronising with itself
niTClk Initiate.vi:1<append>
Session index (starts at zero): 1
Error reported by the instrument driver: 
TClk synchronization is not currently supported with the DDC enabled.
Device: PXI1Slot5
Property: Min Sample Rate
Invalid Value: 1.0e6
Maximum Value: 100.0e6
Status Code: -214237
niTClk Synchronize.vi:1<append>
Session index (starts at zero): 1
Error reported by the instrument driver: 
TClk synchronization is not currently supported with the DDC enabled.
Device: PXI1Slot5
Property: Min Sample Rate
Invalid Value: 1.0e6
Maximum Value: 100.0e6
Status Code: -214237

Similar Messages

RFSG Generation & RFSA Acqusition Precise Timing

Hi NI RF Guys,
I am tyring to find the time difference between RFSG Generation and RFSA Acquisition.
I have initialized the RFSG to transmit Complex IQ Signal and RFSA to acquire that
Complex IQ Signal soon after RFSG generates it.
I am pasting a snapshot of this VI built using NI RFSG and RFSA examples...
I find that the time difference between RFSG Generation and RFSA Acquisition never goes
below 2ms ( two milliseconds ).
Why is there so much of a delay in the RFSA Acquisition,
even though the RFSA has been initialised and is ready for acquiring data ?
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Any thoughts on this would be appreciated ..
Thanks in advance.
Dharmendra
Attachments:
RFSG Gen _RFSA Acq_Timing.JPG ‏174 KB

Hi Dharmendra,
I am a bit confused about what you need to measure? The amount of time it takes the OS to make the software calls could easily be a few milliseconds. Keep in mind that the OS is not deterministic (unless using a real time OS), so using the clock ticks as a timebase for measuring short delays is not common. Even on a real time system, the resolution of the clock might not be fast enough to make a meaningful measurement. You are currently essentially measuring the amount of time it takes for LabVIEW to call the functions in between the two Tick Count vis using the OS clock as a reference.
The software calls are used to configure the hardware, and once the tasks initiate they are based off of hardware-timed clocks and triggers. Measuring the time between software calls is not necessarily beneficial, but we should rather be more concerned with the delay between hardware signals used to begin the acquisition.
Since you are triggering the RFSA task off of the power level of its input which is coming from the RFSG, you should Initiate the RFSA task first. After initiating the RFSA task, the digitizer at this point is ready to accept the trigger signal. Presumably this trigger won't come until after the RFSG task has started as well, so once the RFSG task begins it will trigger the RFSA task as well. Currently, the RFSG task begins, and the RFSA task must wait that ~2ms before it is ready to accept the trigger.
Depending on which RF device you are using, you could also use the RFSG Export Signal.vi to output the start trigger as soon as the generation begins, and use this signal as a digital trigger for your digitizer. The amount of time it takes the computer to read back the data is again non-deterministic, but if you want the tasks to start together then this is possible to accomplish in hardware. The samples that you acquire are all based off of hardware-timed signals and are brought over in chunks back into LabVIEW with the Fetch command.
-John
Message Edited by John P on 04-16-2009 06:46 PM
John Passiak

Atention Satya:How to find Noisefigure by using RFSG and RFSA Drivers

Sir,
I want to find Noise figure by using RFSG and RFSA drivers pls send a LabView code for this.....
Regards,
Santhosh M

Santosh,
Could you give us a little bit more details on the setup that you have. Do you have both the RFSA and the RFSG. Also, if you have the Spectral Measurements Toolkit that will help. The noise figure is the ratio of the SNR of the system input and the SNR of the system output. Are you planning on reading in two signals or are you going to generate a signal to some kind of DUC and read it back in the RFSA? The SNR of signals can be found using the Spectral Measurements Toolkit and hence the noise figure as well.
Looking forward to hear from you.
Regards,
Raajit L
National Instruments

Hi, iam facing proble in synchronizing 4 ni 4472 cards input with pxi -6052e analog output. please help me out to sort out this problem

hi, iam facing problem in synchronizing 4 ni 4472 cards input with pxi -6052e analog output. please help me out to sort out this problem

Hi achyuth,
Thank you for posting on the National Instruments forum.
I am not sure what you are trying to do. Are you trying to input and output at the
same time? Are you just trying to
synchronize all of your inputs? Do you
want them to run off the same clock? If
you could, give me some more information so I can understand your problem
better.
In the meantime, this might help you:
PXI Timing,
Triggering, and Synchronization Capabilities of E-Series Multifunction Data
Acquisition ...
PXI Timing and Synchronization
Thank You,
Nick F.
Applications Engineer

OFDM with NI RFSG and RFSA

Hi
Does someone has any sample vi to implement OFDM using PXI. We had a sample RF front end in NI PXI. We want to incorporate OFDM modulation, scrambling-descrambling, convolution encoding-decoding. If there is any sample example to anyone it will be helpful.
Attach is the RF front end.
Regards
Farooqui
Attachments:
BlockDiagram_TX1.JPG ‏166 KB
BlockDiagram_TX2.JPG ‏156 KB

Hi Farooqui,
Which RFSG/RFSA hardware are you using? There aren't any public OFDM examples for RFSA/RFSG to my knowledge, however we do have a couple for multiple USRP devices here and here. I would take a look through those for the code structure and adapt it by replacing the USRP specific VIs, as a potential starting point.
Matt Lee
National Instruments
Applications Engineer

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How to make a synchronous acquisition of two analog signals with a one channel DAQ ?

Hi !
It is the first time I use Labview. I have just made some easy VIs, and now, I do not know how to deal with my problem...
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- http://digital.ni.com/public.nsf/websearch/4D1435DF82EF494186256D8A006DD6D4?OpenDocument.
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Message was edited by: Ofer Even-Tsur

Hi,
for the error information SAP:Code area="RCVR_DETERMINATION">NO_RECEIVER_CASE_BE</SAP:Code>
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Hi All,
I'm trying to build ARB baseband data on my PC, a rack mount controller in this case, then transmit as quickly as possible with the 5673 (VSG) for real time transmission in a TDD. The best solution I've found is the following, but it doesn't seem to work properly. ... and I'm not sure why. Shouldn't it work?
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Put generation mode into script;
Set the data transfer property to streaming;
Allocate and initialize VSG memory for the corresponding number of samples in my waveform;
Program a script like the following: ( I put comments after the '//' )
script myScript1
 Generate wf0 // play waveform once to open up stream buffer
 Repeat forever
 Clear scriptTrigger0
 Wait until scriptTrigger0 // (*) download next waveform, then use scriptTrigger0 to transmit
 Generate wf0
 end repeat
end script
FYI: Sample rate is in the 10's of MHz. (I've been using 80 MHz)
After initiating I can't do anything. I can't even query the device to check 'SpaceAvailableInStreamingWaveform'. Any subsequenct command gives the following error:
The data being written to the streaming waveform cannot keep up with the output.<LF/>Decrease the sample rate or write data to the streaming waveform more frequently.
Waveform Name: wf0
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script myScript1
Generate wf0 subset (0, 750000) // empty 3/4 of buffer
 Repeat forever
 Clear scriptTrigger0
 Wait until scriptTrigger0 // download new data prior to trigger and play a 3/4 cyclic piece of the buffer
 Generate wf0 subset (750000, 250000)
 Generate wf0 subset (0, 500000)
 Clear scriptTrigger0
 Wait until scriptTrigger0
 Generate wf0 subset (500000, 500000)
 Generate wf0 subset (0, 250000)
Clear scriptTrigger0
 Wait until scriptTrigger0
 Generate wf0 subset (250000, 750000)
 Clear scriptTrigger0
 Wait until scriptTrigger0
 Generate wf0 subset (0, 750000)
 end repeat
end script
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So... after more thought about my application, I'm really not so concerned with small latency involved with additional buffer space.
I'm going to define a buffer that's twice the length of my waveform and simply ping-pong between to subsets. Like this:
script myScript1
 Repeat forever
 Clear scriptTrigger0
 Wait until scriptTrigger0
 Generate wf0 subset (0, waveform_length)
 Clear scriptTrigger0
 Wait until scriptTrigger0
 Generate wf0 subset (waveform_length, waveform_length)
 end repeat
end script
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 Generate wf0 subset (0, (waveform_length - 100) )
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 Wait until scriptTrigger0 // Any device query or command gives an error while waiting for this trigger.
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 Generate wf0 subset (0, (waveform_length - 100))
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Hi everybody,
I'm designing a wireless audio signal simulation system that will read an audio signal from a file and modulate the signal using NI 5671 RFSG, then broadcast it to be received at an NI 5660 RFSA.
All I need is some guidance from you guys. Some related examples would be of great help since I'm a new user of NI hardwares and software.
Thanks in advance.
Muslim,
Communication Engineering Student,
International Islamic University Malaysia.

Hi,
I’m going to
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I have another question on the part
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your speakers or you just want to be able to see the array of samples? Have you
seen the example “MT niRFSA Demodulate FM.vi”? And if so why it does not help? Here
is another example for FM modulation: Sound File Frequency
Modulated Generation using NI-567x I would like to let you know that all
those examples Paul and I are giving you are located at our website most are
free and you may find them yourself; if you have the necessary drivers and
toolkits installed you should be good to go. “The examples
available do not show what I'm searching for” What are you
searching for? What type of analysis do you need to perform?
Remember
that in the RFSA part of your project what you are going to be receiving will
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run both FM example the RFSG and RFSA with no modification for a better
understanding of what is happening.
I hope it helps
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters

Phase measurement RFSG RFSA

Hello,
Currently, I work with RFSA and RFSG to analyse signal wich is generated by the RFSG. I would like to measure phase in my RFSG module to do the AM/PM characteristics. For now, i didn't find any functions to measure this phase. Moreover, i found a function for phase measurement for RFSA but it did not work. This function is Get Frequency where we can have phase too.
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I am attaching the error message in the trace file below.
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 at sun.net.www.http.HttpClient.parseHTTPHeader()
 at sun.net.www.http.HttpClient.parseHTTP()
 at sun.net.www.http.HttpClient.parseHTTPHeader()
 at sun.net.www.http.HttpClient.parseHTTP()
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream()
 at java.net.HttpURLConnection.getResponseCode()
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">
Regards
Srikumar

Hi,
Here are some possible reasons...
1. The connection seems to have been dropped by the server.
2. A non-suuported HTTP version or format was used.
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Regards
Manohar

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Synchronis​e NI-RFSG / NI-RFSA with NI-TCLK

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Synchronise NI-RFSG / NI-RFSA with NI-TCLK