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Thread: Streaming data to E4438C


Permlink Replies: 4 - Pages: 1 - Last Post: Aug 7, 2010 11:28 AM Last Post By: tetracilin
tetracilin

Posts: 5
Registered: 07/25/10
Streaming data to E4438C
Posted: Aug 3, 2010 3:52 AM
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Hi,

I am trying to design a system where waveform data is to be streamed continuously to E4438C signal generator for FM modulation & transmit.
The wave data is generated by a non-Agilent spectrum analyser and stream to PC via Matlab. This data is in binary format since this connection use RS232 standard.
The system is required to operate continuously i.e. the system acts like a RF repeater.
My question then is :
- is the E4438C able to receive streaming waveform data from PC
- can the built-in arbitrary waveform generator create streaming waveform data and feed to the FM modulation
I tried to look into the programming guide & the manual of the signal generator and the Signal studio documents but there was no related data on this subject.

Thanks for your help,
tabbott


Posts: 1,483
Registered: 07/24/09
Re: Streaming data to E4438C
Posted: Aug 3, 2010 5:12 PM   in response to: tetracilin in response to: tetracilin
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Hello -

E4438C can accept external data either through its IQ inputs, the N5102A DSIM for digital IQ Inputs/outputs or through the N5110B Baseband Studio for waveform capture and playback. E4438C programming manual gives the input format required for IQ input data.

The internal baseband generator/AWG can play data input either in real time or arbitrary waveform. FM modulation may also be done as part of the AWG waveform. The internal BBG/AWG cannot route its output through the FM modulation path.

A problem of this ‘repeater’ idea is each device most likely formats the data differently; i.e. E4438C requires an 8 bit byte for each data bit. Will the PC have software that formats the data stream correctly from the non-Agilent SA. Another problem is the RS-232 connection; RS-232 doesn’t stream data, it slowly bit by bit passes them along.

If this non-Agilent SA is creating the waveform why send it to a PC/source? Have it directly modulate a vector signal generator like the E4438C/E8267D/N5182A which upconverts the data to RF for transmitting. Also if the non-Agilent SA is creating the waveform why use MATLAB? Is MATLAB being used to generate the AWG waveform then the non-Agilent SA generating just capturing a signal from the air/cable/what?

Interesting idea anyway.

Regards -
tetracilin

Posts: 5
Registered: 07/25/10
Re: Streaming data to E4438C
Posted: Aug 4, 2010 12:25 AM   in response to: tetracilin in response to: tetracilin
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"

The internal baseband generator/AWG can play data input either in real time or arbitrary waveform. FM modulation may also be done as part of the AWG waveform. The internal BBG/AWG cannot route its output through the FM modulation path.

"

Do i understand this correctly if i take away : the Agilent signal studio can enable AWG to re-create the waveform data and FM modulate it .
"

A problem of this ‘repeater’ idea is each device most likely formats the data differently; i.e. E4438C requires an 8 bit byte for each data bit. Will the PC have software that formats the data stream correctly from the non-Agilent SA. Another problem is the RS-232 connection; RS-232 doesn’t stream data, it slowly bit by bit passes them along.

"

because the non-agilent SA only export data through rs232 in binary format so we are planning to use Matlab on a PC to do the formatting job to prepare data ( to comma separated value type ) for E4438C AWG. PC & Matlab is used to act as an interface between devices.
Is it possible to use a separate AWG ( U2761A ) to generate baseband signal & FM modulation and a RF transmitter like N9310A for the job ?

Thank your for your support
Best wishes
tabbott


Posts: 1,483
Registered: 07/24/09
Re: Streaming data to E4438C
Posted: Aug 6, 2010 9:02 AM   in response to: tetracilin in response to: tetracilin
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Hi - Here are answers to your questions...

Q: Do i understand this correctly if i take away : the Agilent signal studio can enable AWG to re-create the waveform data and FM modulate it ?
A: Agilent signal studio software is separate from the internal BBG/AWG of the E4438C. AWG can play waveform files that are input. AWB cannot play waveform data and then FM modulate it; the FM has to be incorporated into the waveform file using MATLAB, Agilent ADS, etc.


Q: because the non-agilent SA only export data through rs232 in binary format so we are planning to use Matlab on a PC to do the formatting job to prepare data ( to comma separated value type ) for E4438C AWG. PC & Matlab is used to act as an interface between devices.
A: Yes, this will work and is how I supposed you would do it.


Q: Is it possible to use a separate AWG ( U2761A ) to generate baseband signal & FM modulation and a RF transmitter like N9310A for the job?
A: Yes and external AWG/ARB could be used to generate the baseband signal with FM modulation incorporated and them used it to modulate the N9310A-001 (with IQ inputs) as the transmitter.

Glad to be of help -


Relevant Products:#E4438C#
tetracilin

Posts: 5
Registered: 07/25/10
Re: Streaming data to E4438C
Posted: Aug 7, 2010 11:28 AM   in response to: tetracilin in response to: tetracilin
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Thanks for the detail Q&A . It was a great help

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