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PicoZed SDR Software-Defined Radio Spurious sidebands when using FMC carrier Ethernet 1 port
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Spurious sidebands when using FMC carrier Ethernet 1 port

andrew_senior
andrew_senior over 8 years ago

I'm using a PicoZed SDR module (Rev. C) on the FMC carrier board (Rev. C) and I find that when I connect the board to the network using the Ethernet 1 port, there are significant spurious sidebands on the transmission at ~ +/- 12.5 kHz from the carrier. At a Tx frequency of ~1400 MHz, they are about -38 dBc. The sidebands are absent if I use the Ethernet 2 port.

 

The sideband level varies with Tx frequency. For example, at 200 MHz they are only about -60 dBc. The relative level to the carrier remains the same when the Tx attenuation is increased. The sidebands are present for all Tx ports: 1A, 1B, 2A and 2B.

 

Has anyone else observed this?

 

Andrew.

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  • andrew_senior
    0 andrew_senior over 8 years ago

    For the record, further investigation revealed that this issue only affected one SOM, so it looks likely to be an issue with that particular unit. After discussions with Avnet I now regard this issue as solved.

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