On Tue, Feb 11, 2020 at 7:48 AM Lukas Karch wrote:
>
>
> Regarding the setup of the Red Pitaya, i mostly followed the instructions
> on this site:
> https://casper-toolflow.readthedocs.io/projects/tutorials/en/latest/tutorials/redpitaya/red_pitaya_setup.html.
> Only "git clone
Thank you for the quick response. I tried specifiying the port number but the same error appeared. I tried using the .fpg and python script you suggested and a very similar error message appeared:
lukas@lukas-HP-Pavilion-x360-Convertible-15-br1xx:~/Downloads$ python
Hi,
Thank you for your reply!
I would consider LimeSDR or maybe XTRX, it have a GPS onboard and PCI-ex
interface.
Best regards,
Tavi
În mar., 11 feb. 2020 la 08:05, Mugundhan vijayaraghavan <
v.vaishnav151...@gmail.com> a scris:
> Hello Tavi,
>
> There are implementations of red pitaya as a
Hello Tavi,
There are implementations of red pitaya as a SDR by Pavel Demin, but the
max. bandwidth (that he has implemented) is about 2.5 MHz and also is
limited in tuning range.
Yes, using SDRs is another option. LimeSDR is a possible candidate which
gives tunability and max. instantaneous
Hello,
Reading this topic I've understand that Red Pitaya cannot tune to any
frequency band like a SDR does. From my point of view is not adequate to
use as a wide band solar bursts spectrograph.
I would use SDR(s) instead, with the radio front end already made. The
speed of sweeps is a concern
Hi Ross,
I agree with what you say.
At this point, if one is interested in only a single channel, then Dan's
idea of quadrature mixing can be tried out.
If one has to use mixers, rather than 60 MHz, depending on the filter's
roll off, one may have to settle for slightly smaller bandwidth.
Hi Mugundhan,
If you have a single stage mixer with an LO at 80MHz, it has the problem
that the effective mixer signal may not be just a sine wave, but instead a
sine wave with a tiny DC offset.
If you have a DC offset that's X dB down from the sine wave amplitude, it
will pass the original
Hi Hari,
Good point regarding RFI below 25 MHz, though in coming years more and more AM
stations may go off air ! It may be hard to find high quality, inexpensive
mixers for this application having a very high dynamic range (>60dB). Perhaps
Dan's suggestion of using quadrature sampling is a
if you only want one input, and you can't build a downconverter that
provides the dynamic range,
you might want to consider using the two adc's on the board, and
implementing a quadrature downconverter,
(mix by both 0 and 90 degree LO's and then low pass filter both the
in-phase and quadrature
Hi Ross,
Just to add, we can also have the lo at 80mhz, and use the lower side band.
80 will be at 0, 20 will be at 60. But the band can be flipped offline. We
can have a strong lpf at 60mhz, which can cut the lo off before downstream
processing.
Mugundhan
On Mon, 10 Feb 2020, 15:18 Mugundhan
Hi Ross,
I'm not working with Colm on this. So I don't know about the resources
available to him.
What you're saying is true. Doing it with a single stage may be problematic
as with 20 MHz LO, the there will be overlap of the side bands. So,
minimally, we need to have two stages. where the 20-80
Hi Mugundhan,
Could you say a little more about how you're downconverting 20-80MHz to
0-60MHz? My understanding is that this is not easy to do while retaining
signal quality. The band overlap of the input and output bands means
simple conversion methods with normal mixers don't work.
Ross
On
Hi Jishnu,
Down-conversion is inevitable with red pitaya given the max.
sampling frequency is 125 MSPS for the on-board ADC (for the 20 - 80 MHz RF
band here). The dynamic range of the mixer used in the down-conversion
becomes rather important here primarily because of the RFI channels
Sorry Jishnu, I didn't see the mixer question.
If the mixer has a poorer dynamic range than the ADC, then the chain's DR
is limited by that. So, as far as the mixer's DR is better than a 14 bit
ADCs, it should be fine.
Mugundhan
On Mon, Feb 10, 2020 at 1:38 PM Mugundhan vijayaraghavan <
Hi jishnu,
With red pitaya, you have to down convert 20-80 to 0-60 baseband to use
the band fully. As such, it has a cutoff at 65MHz.
Thanks,
Mugundhan
On Mon, 10 Feb 2020, 13:30 Jishnu Nambissan T, wrote:
> Hi Mugundhan,
>
> With red pitaya, can you sample 20-80 MHz without downconversion ?
Hi Mugundhan,
With red pitaya, can you sample 20-80 MHz without downconversion ? And if
analog down conversion is required, wouldn't that restrict the usable dynamic
range (unless a high level mixer is used) ?
Jishnu
From: "Mugundhan vijayaraghavan"
To: "casper"
Sent: Thursday,
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