Thank you very much for the explanations!
On Tue, Mar 6, 2018 at 3:26 PM, Robin Coxe <robin.c...@ettus.com> wrote:
> Hi Dave. The official product announcement of the USRP N310 was just
> posted today. The N310 is now orderable!
> On Mon, Mar 5, 2018 at 2:11 PM, Dave NotTelling via USRP-users <
> email@example.com> wrote:
>> Just saw that the N310 is officially on the ettus.com website. Curious
>> about the following:
>> - The product pages says that it's not for fast tuning. Should I
>> expect roughly the same tuning times as the B2x0 radios?
>> Currently, the tuning times are actually a bit slower than the B200/E310
> (~140 ms) because the frequency is adjusted via SW SPI commands to the
> AD9371 transceiver. A future performance enhancement will be to implement
> frequency tunes via GPIO lines from the FPGA. The AD9371 was not designed
> for fast frequency hopping. The AD9371 has an embedded ARM Cortex-M0
> processor that orchestrates an on-chip quadrature error correction (i.e.,
> I/Q imbalance calibration) that takes an appreciable amount of time to
> converge. The fastest that the device will be ever be capable of tuning
> without disabling this calibration is ~2 ms.
>> - At the bottom of the page there is a note about only being able to
>> tune 2 LOs independently. Does this mean that even though there are 4 RX
>> paths, you can only look on 2 large bands at the same time (assuming all
>> the bands you want are > 200 MHz apart)?
>> The N310 has two daughterboards, each of which have an AD9371. The
> AD9371 has 2 Tx and 2 Rx channels per chip. The 2 Tx and 2 Rx channels
> each share an LO, so you can tune each daughtercard's transmitters and
> receivers independently, but not all 4 transmitters and receivers
> independently. For additional details, take a look at the AD9371 product
> page: http://www.analog.com/en/products/rf-microwave/integ
>> - Are timed commands supported the way they are for the N and X
>> series? I don't mean the limited timed command support that the B series
>> radios have.
>> Timed commands do exist for the N310, however there is a subtlety here.
> Any interactions with AD9371 transceiver are not currently supported via
> timed commands. Future support is possible, but with accuracy in the
> millisecond range.
>> - If so, is there just one command FIFO like in the N and X series?
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