The Bandwidth of PXI-5600

[CTTsai]

Dear Sir, Please see the attached file. There are 3 filters, a LPF, a BPF and a 20MHz BPF. And there are also 3 Phase-locked loops. Is it possible to change the parameters of these component? My application is to use PXI-5600 to downconvert 150MHz, 400MHz and 1067MHz to 5~25MHz IF at the same time. I think that it may be implemented if the PLL and BPF(not 20MHz BPF) is changeable. If the BPF and PLL performance is changeable, how to change it by LabView? Thanks!

[Ayman K]

CTTsai,

It is not possible to change the parameters of the filters and the PLLs used in the PXI-5600, although it is only posibble to change the attenuation level. The attachment shows what you need to use to change the attenuation level of the PXI-5600. Now, again the bandpass of the downconverter is a real time bandwidth of 20 MHz and you would need to tune to a 20MHz wide frequency component at a time. You would not be able to tune to different components at the same time. I hope this answers your questions.

Ayman K

[Andy_Hinde]

CTTsai,
Ayman is correct that the physical parameters of the PXI-5600 downconverter are fixed and determine the specified performance of the unit. It's real-time bandwidth is a HW property designed to be 20 MHz, with an IF output range between 5 - 25 MHz. Changing the parameters would require a redesign of the product and at that point would no longer be a PXI-5600, but some other theoretical product with different specifications.

Just as a point of reference, opening up the RF enclosure voids the National Instruments one year warranty on products, and the act of opening the enclosure will cause damage to interconnects between different components of the board if not done properly.

Regards,
Andy Hinde
National Instruments

[WooYee]

Our PXI-5600 are deployed at HF environment(1M to 15MHz frquencies of interest).  As we all know that HF environment is very noisy and its noise floor fluctuate with times.  How PXI-5600 open at 20MHz bandwidth take care of noise issue.

If I am only monitoring from 1MHz to 2MHz(Which means we only need 1MHz bandwidth), and PXI-5600 always opens at 20MHz bandwidth?  The performance will be bad compare to other off-the-shelve devices? How the logic of flow for NI to take care of good SNR where NI qualified their product from 9kHz to 2.7GHz.

[Andy_Hinde]

Hello WooYee,

Unfortunately the information you are requesting is proprietary design information.

Rest assured, however, that the specifications for the PXI-5660 RF Vector Signal Analyzer and PXI-5600 RF Downconverter are guaranteed in the stated frequency range of 9 kHz to 2.7 GHz. If you are seeing performance outside of the stated specification range, National Instruments will work with you to solve the issue.

Regards,

Andy Hinde

National Instruments

[WooYee]

Thanks Andy,

The opportunity for this project is huge and customer are checking against competitor solution against ours.

NI ASEAN will be having a teleconference to iron out some parameters.  Thanks

[Andy_Hinde]

Hello WooYee,

If this is a large sales opportunity, perhaps you should contact our RF Systems Engineers to make sure all questions are answered effectively and quickly.

Please contact me via email and we can discuss this further. We can assist you greatly in closing this opportunity.

Regards,

Andy Hinde

National Instruments