Hello Folks,
Here I'm implementing the transmission of LoRa Frames and I want to be able
to stop the flowgraph(Stop Transmitting) between frames say the packet is
set to transmit every 3s so at tx_eob turn off tx and tx_sob start tx.
Below is my Flow graph code snippet can you let me know how I ca
The problem is worse than what you think.
There's some digital processing logic from UHD data stream to USRP internal
ADC. DAC is the same. These logics are implemented in FPGA using fixed
point math. Wrap around happens if I/Q amplitude >=0.5, outputs are totally
messed up.
After DAC it's in analo
So what I'm doing is transmitting with a HackRF One and when I run the
flowgraph the transmission starts and frames are sent as bursts and
between the bursts, the transmitter stays on and I would like to turn it
off at tx_eob and turn on tx at tx_sob
Below is the screenshot of the current flowgraph
Hi Vamshi,
First, what do you mean by turning off/on the transmitter?
Marcin
pon., 6 cze 2022 o 09:14 Vamshi Sainath Gavani
napisał(a):
> Hello Folks,
>
> Here I'm implementing the transmission of LoRa Frames and I want to be
> able to stop the flowgraph(Stop Transmitting) between frames say the
This link contains the relevant information to the structure of a flowgraph’s
top block function, which is what you pasted below.
https://wiki.gnuradio.org/index.php/Handling_Flowgraphs
You may find some help regarding handling burst tags in the documentation for
these blocks.
https://github.c
Vamshi,
I don't think that HackRF One supports bursty transmission (like USRP UHD
does). If you want to achieve a 3 seconds period bursty Tx you have to
provide an adequate amount of 'null' samples between the transmission
bursts to drive DAC. To verify that information I think you can ask on
HackR
On 2022-06-05 23:33, 能书能言 wrote:
Hi,
Recently, I am confused about the process from baseband signal to
RF transmission. I know that baseband signal is sent to USRP through
UHD. If the signal amplitude exceeds 1, what will happen? I looked up
some mailing lists and mentioned nonlinearity. I
Vamshi,
I just gave you an example in the last message. To get more information
about the stream tags, please check out the GNU Radio wiki website
https://wiki.gnuradio.org/index.php/Stream_Tags
Marcin
pon., 6 cze 2022 o 15:46 Vamshi Sainath Gavani
napisał(a):
> can you give me an example of wha
DAC nonlinearity is not a problem. The problem is the datapath.
In USRP B210, the path is PC -> FPGA -> AD9361 datapath-> AD9361 DAC.
They are not saturated to {-1.0, +1.0}, >=0.5 will cause internal logic
overflow and wraps around.
能书能言 <2127629...@qq.com> 于2022年6月6日周一 19:51写道：
> Hi,WarMonkey
Hi Vamshi - I vaguely remember the gr-osmosdr being optimized for
transmission - the sinks and sources have different lifetimes.
For the price of a second hackrf, you can buy the hackrf add on known as
the "operacake" which supports multiple antenna configurations - which
can configured for f
Sorry, that's incorrect. The B210 is completely linear up to +/- 1.0.
Here's a spectrum analyzer trace confirming it.
B210 linearity test
Ron
On 6/6/22 11:37, WarMonkey wrote:
DAC nonlinearity is not a problem. The problem is the datapath.
In USRP B210, the path is PC -> FPGA -> AD9361 datapa
Hello, for you I'm sure it's simple, but I'm having a hard time isolating a
carrier of an ofdm (1k) signal (474 Mhz for example) to see it in the time
domain.
Would someone be so kind as to tell me a method of making a bandpass filter
that would do the job?
Thank you
Thank you for your answers, I can accept that the samples whose
amplitude exceeds 1 are simply clipped. The high PAPR in OFDM is a big problem.
According to the previous analysis, if I control the baseband amplitude through
the "multiply const" module, when it keeps increasing The multiplied
I wonder if it is currently possible to have the label of a GUI element
come from a variable in a config file.
For example, A QT GUI Range block's label is
str('Power: ' + ch_1_label)
Where ch_1_label is coming from a variable config block. However, when I
run the flowgraph I get the error
'Unbou
I fixed the error, but am still unable to update the label from the config
file.
On Tue, Jun 7, 2022 at 10:29 AM Anish Mangal wrote:
> I wonder if it is currently possible to have the label of a GUI element
> come from a variable in a config file.
>
> For example, A QT GUI Range block's label is
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