Hi,
don't have a device to test with me, but don't forget that the *tuning* to that frequency
might be technically possible due to FPGA frequency shifting, so that indeed the frequency
10000 kHz gets shifted to baseband, 0 Hz.
(You being able to observe the LO hints at that: the "physical" tuner doesn't go as low,
and the remainder of frequency shifting is done digitally, so that the LO doesn't end up
at 0 Hz.)
However, this doesn't mean that the analog signal chain can actually let through that
frequency. In the end, the N32x has an RF frontend, and its DC response is undefined/bad
by design.
You can probably work around that, but it depends on your use case: Why are you trying to
observe a 100 kHz-centered signal with a device that has a bandwidth thousands of times of
that? I suspect you're on to something interesting!
Best regards,
Marcus M
On 22.03.23 23:12, Marcus D. Leech wrote:
On 22/03/2023 18:06, jmalo...@umass.edu wrote:
When the frequency is called back, it gives back that it is set to 100 Khz. The lowest
it goes is 5 hz.
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Your command-line is here:
|./rx_samples_to_file --nsamps 3000000 --channel 0 --ant "RX2" --subdev "A:0" --gain 50
--rate 3e6 --freq 100000
Which means you're asking the hardware to tune to a center frequency of 100kHz. That
isn't possible with this hardware.
I refer you to the datasheet here:
https://www.ettus.com/wp-content/uploads/2019/04/USRP-N320-Datasheet-2.pdf
|
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