On 03/24/2018 12:41 AM, Matis Alun via USRP-users wrote:
Hi,
The TwinRx frequency specifications is from 10MHz to 6GHz.
However, some tests shows that I can select the center frequency around 10 MHz
with a
sampling frequency of 25MHz
which allows to make some acquisitions in the HF band (3-30 MHz) with a very
good quality.
My question is: why the specs limits to 10 MHz ? Is the RF part have degraded
performances
under this frequency ?
Below this question is: we have to deliver a big HF (3-30 MHz) system to a
customer. The
acquisition part is actually built with
2 x N210 with LFRX daughter boards. Due to the lack of chain gain of this
configuration,
we add some RF pre-amplifiers
in order to have good RF levels at the LFRX input.
Maybe that this configuration can be replaced by 1x X300 + TwinRx (we didn't
make this
choice because of the TwinRx specs) ?
Regards,
matis
My guess is that signals below 10MHz can be received, but the RF
amplifiers in the low-band portion of the TwinRx likely fall off in gain
quite a bit
below 10MHz.
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