On 11/14/2018 05:35 AM, Maria Jesus Cañavate Sanchez wrote:
Thank you for your answer Markus!
The power which is computed by squaring the real and imaginary
components of the digital signal is not equal to the absolute RF power
measured at the receiver port, right?
That value is *linearly proportional* to the power as seen at the
antenna port. You'd need to calibrate to determine this relation.
I guess the absolute RF power cannot be measured but the power
difference between two signals.
Thank you very much in advance.
Best regards,
Maria Jesus
On 13/11/2018 17:31, Marcus D Leech wrote:
No there is not.
Power is computed by squaring the real and imaginary components of
the signal and adding and averaging over a suitable time interval.
Phase is always measured relative to some other signal. So measuring
at the antenna port makes no sense. Unless you’re talking about
measuring signal phase change. Which is definitely still a digital
domain question.
Sent from my iPhone
On Nov 13, 2018, at 11:18 AM, Maria Jesus Cañavate Sanchez via
USRP-users <usrp-users@lists.ettus.com> wrote:
Thank you very much for your answer, it has been really useful.
Another question I wanted to ask is if it is possible to measure the
RF power and phase at the receiver port before the signal goes to
the ADC. If so, how can I obtain that RF information? Is there a way
to show it in GNU radio or I need another software?
Thank you very much in advance!
Best regards,
Maria Jesus
On 13/11/2018 12:34, Piotr Krysik via USRP-users wrote:
Hi,
No, it's not. Each of your UBX-160 has one Rx chain.
BTW somehow it is common confusion that Tx/Rx and Rx2 ports can be
used
to receive signals simultaneously. I have to explain this even to
people
with professor degree in electronic engineering, that behind these
ports
there is one Rx chain and there are switches on UBX/SBX/WBX/etc that
select to which of these ports this Rx chain is connected.
As Fabian has written there are TwinRX daughter cards, each with
two Rx
chains, that you can use on a USRP X310 to have 4 receivers.
Best Regards,
Piotr Krysik
W dniu 13.11.2018 o 13:08, Maria Jesus Cañavate Sanchez via USRP-users
pisze:
Hi again,
Thank you very much for your answer. I have bought two daughter
boards
UBX-160, is that enough to have 4 receivers at the same time?
Thank you!
Best regards,
Maria Jesus
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