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4.2.9 I/Q Output Data Sample Rate

Purpose: Specifies the NetSDR I/Q data sample rate.

Control Item Code: 0x00B8

Control Item Parameter Format:

The first parameter is a 1 byte receiver channel ID. This parameter is ignored since all channels must be the same.

The following 4 byte parameter specifies the NetSDR I/Q Data sample rate in Hz.

This parameter limited to frequencies that are integer divisions by 4 of the 80MHz A/D sample rate.

This message is not needed for the FIFO mode where the direct A/D samples are captured to the NetSDR's memory

then sent back the host bypassing the Digital Down Converter(DDC).

There are limits to the range of I/Q sample rates that are supported depending on the number of bits per sample that

are specified:

The maximum sample rate supported is 2,000,000 Hz in the 16 bits/sample mode.(80MHz/40)

The maximum sample rate supported is 1,333,333 Hz in the 24 bits/sample mode.(80MHz/60)

The minimum sample rate supported is 32,000 Hz in the 16 or 24 bits/sample mode.( 80MHz/250)

Example, to set the NetSDR I/Q data sample rate to 500KHz (80MHz/160)

The host sends:

[09][00] [B8][00] [00] [20][A1][07][00]

The Target would reply with the following:( this will return the actual sample rate that will be used in the

case of a value not a multiple of 80MHz/4)

[09][00] [B8][00] [00] [20][A1][07][00]

Rev. 1.03 2011-11-01

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RFspace NetSDR Manual de usuario Pagina 21