USRP1 RX and TX chain delays

GNU Radio
1

Hello

Allow me to ask whether someone knows about the delay of the RX and TX
DSP
chains from the input of a LFRX daughterboard to the output of the DSP
chain
i.e input to the RX buffer and vice versa in the TX chain?
I’m interested in the delay at a decimation factor of 256 and at an
interpolation factor of 512 respectively.

kind regards

Jesper Kristensen
Research Assistant
Aalborg University, Department of Electronic Systems,
Technology Platforms Section
Frederik Bajers Vej 7A DK-9220 Aalborg Ø
Denmark

2

Jesper M. Kristensen wrote:

Hello

Allow me to ask whether someone knows about the delay of the RX and TX
DSP
chains from the input of a LFRX daughterboard to the output of the DSP
chain
i.e input to the RX buffer and vice versa in the TX chain?
I’m interested in the delay at a decimation factor of 256 and at an
interpolation factor of 512 respectively.

kind regards

Jesper Kristensen
Research Assistant
Aalborg University, Department of Electronic Systems,
Technology Platforms Section
Frederik Bajers Vej 7A DK-9220 Aalborg �
Denmark

im using rfx400 boards, from rx to tx at the RF connectors ive measured
about 50ms of delay. decimating at 256, interpolating at 512, seems to
be about the same no matter how many taps on my filter or even without
filter

3

Jesper M. Kristensen wrote:

I think you could look at the UCLA work on delay measurement on USRP and
GNU
Radio… the work done by Thomas S.

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