Dear Marcus,
Please avoid adding more confusions rather than clarities.
The term upconversion and downconversion are common terms used in the
radio engineering industry, but may not be common among other technical folks.
In radio engineering industry, there are more than 1 type of
On Sat, Mar 15, 2014 at 11:14 AM, Marcus D. Leech mle...@ripnet.com wrote:
The SBX does analog downconversion, nothing more. It knows nothing about
the incoming signal, and doesn't demodulate it in any way.
That is what SDR is all about--the signals are represented as
complex-baseband (i/Q)
Hi,
There are no documentation of what SBX performs on incoming or
outgoing signals. https://www.ettus.com/product/details/SBX
IMHO Ettus is among the brands where there is the _least_ surprises
just because the exact schematic is published, you can see _exactly_
what the SBX does to your
On Sat, Mar 15, 2014 at 4:05 PM, Sylvain Munaut 246...@gmail.com wrote:
There are no documentation of what SBX performs on incoming or
outgoing signals. https://www.ettus.com/product/details/SBX
IMHO Ettus is among the brands where there is the _least_ surprises
just because the exact
Hi,
Let's see yourself at
http://code.ettus.com/redmine/ettus/projects/public/documents
This is the link referred by
http://www.ettus.com/kb/detail/frequently-asked-questions
This link leads to The page you were trying to access doesn't
exist or has been removed !
Wow, they have a
On Sat, Mar 15, 2014 at 5:14 PM, Sylvain Munaut 246...@gmail.com wrote:
You may refer to previous conversations. Do you agree with him that a
simple quadrature downconverter doesn't need to care about clock drift
because it just simply downconverter and nothing more?
Yes ...
Cheers,
On Sat, 15 Mar 2014 17:46:58 +0800
Activecat active...@gmail.com wrote:
In this case I shall rephrase my question to:
How to compensate the error due to clock drift which is not handled
by a simple quadrature upconverter ?
I do not want to sound rude or anything, but you are asking very
basic
On Sat, Mar 15, 2014 at 10:46 AM, Activecat active...@gmail.com wrote:
On Sat, Mar 15, 2014 at 5:14 PM, Sylvain Munaut 246...@gmail.com wrote:
You may refer to previous conversations. Do you agree with him that a
simple quadrature downconverter doesn't need to care about clock drift
because
On Sat, Mar 15, 2014 at 5:56 PM, Tom Rondeau t...@trondeau.com wrote:
It was mentioned earlier in this thread, you can use a PLL to lock to
a carrier. Basically, you need an algorithm that performs carrier
recovery.
This thread is starting to get a little too confrontational, so we all
need
On 03/15/2014 02:57 AM, Activecat wrote:
Dear Marcus,
Please avoid adding more confusions rather than clarities.
The term upconversion and downconversion are common terms used in the
radio engineering industry, but may not be common among other technical folks.
In radio engineering industry,
This thread is starting to get a little too confrontational, so we all
need to take a bit of a break. Please take a look at the PLL blocks in
GNU Radio; you can find them under the Synchronizers category in the
block tree of GRC. Spend some time understanding these blocks and how
to use them.
I have found the answers.
http://nutaq.com/en/blog/multi-channel-synchronization-fpga-based-daq-systems
http://nutaq.com/en/blog/brief-overview-frequency-synchronization-ofdm
On the Nutaq platforms (ZeptoSDR, PicoSDR) you can control VCXO voltage
DAC from GNU Radio (and from FPGA user logic) to
Hi,
I try to send square wave from one USRP to another.
The received signal at the receiver USRP is very different from what
was being sent.
This is just a very simple setup. What could be wrong ..?
Apparently your understanding of how things work :)
First thing, square waves have
On 03/13/2014 09:32 PM, Activecat wrote:
I try to send square wave from one USRP to another.
The received signal at the receiver USRP is very different from what
was being sent.
This is just a very simple setup. What could be wrong ..?
What you are seeing is a classic case of frequency/phase
Dear Sylvain,
On Fri, Mar 14, 2014 at 2:17 PM, Sylvain Munaut 246...@gmail.com wrote:
First thing, square waves have infinite bandwidth, the DAC can't
generate them properly, the ADC can't capture them properly and
they'll be modified by the IF filters. The effect of that is to round
off the
Dear Johnathan,
On Fri, Mar 14, 2014 at 2:21 PM, Johnathan Corgan
johnat...@corganlabs.com wrote:
On 03/13/2014 09:32 PM, Activecat wrote:
I try to send square wave from one USRP to another.
The received signal at the receiver USRP is very different from what
was being sent.
This is just a
On 14.03.2014 09:50, Activecat wrote:
In spite of calibrating things, you have only made the transmitter and
receiver local oscillator frequencies close. All real-world receivers
must implement a correction loop to estimate this frequency and
compensate for it, which eliminates the rotation.
On 03/14/2014 01:50 AM, Activecat wrote:
In spite of calibrating things, you have only made the transmitter and
receiver local oscillator frequencies close. All real-world receivers
must implement a correction loop to estimate this frequency and
compensate for it, which eliminates the
On 03/14/2014 01:05 PM, Johnathan Corgan wrote:
The hardware PLL in the receive section of the daughterboard serves an
entirely different purpose; it is there to create the local oscillator
signal at the frequency requested when tuning. However, that frequency
is ultimately derived from a
Dear Martin,
On Fri, Mar 14, 2014 at 5:13 PM, Martin Braun martin.br...@ettus.com wrote:
Here's a very brief explanation: The PLL for the synthesizer makes sure the
locally generated frequency is stable (per-device). It's physically
impossible to make perfectly aligned oscillators. By throwing
On 03/14/2014 10:51 PM, Activecat wrote:
Dear Martin,
On Fri, Mar 14, 2014 at 5:13 PM, Martin Braun martin.br...@ettus.com wrote:
Here's a very brief explanation: The PLL for the synthesizer makes sure the
locally generated frequency is stable (per-device). It's physically
impossible to make
Dear Marcus,
On Sat, Mar 15, 2014 at 11:14 AM, Marcus D. Leech mle...@ripnet.com wrote:
The SBX does analog downconversion, nothing more. It knows nothing about
the incoming signal, and doesn't demodulate it in any way.
Please be clarified what do you mean by analog downconversion.
At the
On 03/15/2014 12:10 AM, Activecat wrote:
Dear Marcus,
On Sat, Mar 15, 2014 at 11:14 AM, Marcus D. Leech mle...@ripnet.com wrote:
The SBX does analog downconversion, nothing more. It knows nothing about
the incoming signal, and doesn't demodulate it in any way.
Please be clarified what do you
23 matches
Mail list logo
