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analogdevicesinc / plutosdr-fw

PlutoSDR Firmware
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Does the ADC sampling affect by the the RF frequency switch? #19

Closed commthu closed 6 years ago

commthu commented 6 years ago

When i swtich RF center frequecy, does the sampling affect by the the RF frequency switch? I wish during the frequency tunning, the ADC keep working. This is very important for my applications.

rgetz commented 6 years ago

It depends on your setup, but nominally, when switching the LO over 100MHz, a re-calibration is needed, and the act of calibration will cause samples to be stopped.

I think the driver is optimized to not return samples until the LO is locked, since most comms algorithms don't want to see things sweeping.

tfcollins commented 6 years ago

Fastlock profiles can remove most of this overhead: https://wiki.analog.com/resources/tools-software/linux-drivers/iio-transceiver/ad9361?s[]=fastlock#fastlock_mode

mhennerich commented 6 years ago

If you only tune the RX LO or if you disable automatic calibration mode you won’t see interruptions.

commthu commented 6 years ago

Thanks rgetz,tfcollins and mhennerich. the frequecny switch is 45Mhz. I dont want sampling interruption. if disable the automatic calibration can keep the sampling not interrupt, that is fine.

mhennerich commented 6 years ago

ok - close this.