red pitaya sink in GRC

Applications, development tools, FPGA, C, WEB
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tech62
Posts: 29
Joined: Wed Mar 29, 2017 12:31 pm

red pitaya sink in GRC

Post by tech62 » Thu Oct 19, 2017 9:51 am

Hi,
Simple question.
What range of input values does the "Red Pitaya Sink" in GRC accept ?
Is it 0-1 as a float ? or -1 to +1, or some other range. ?

I am interested in being able to create the largest output possible from the RP OUTs when using the sdr_transceiver application.
Not for driving an antenna, but for easily viewing on oscilloscope.

I do not know what happens once the data leaves GRC and goes into the RP, hence my question.
Thanks for any insights.
tech62

pavel
Posts: 516
Joined: Sat May 23, 2015 5:22 pm

Re: red pitaya sink in GRC

Post by pavel » Thu Oct 19, 2017 10:15 am

What range of input values does the "Red Pitaya Sink" in GRC accept ?
It should be around [-2, 2] or [-1.9, 1.9].

tech62
Posts: 29
Joined: Wed Mar 29, 2017 12:31 pm

Re: red pitaya sink in GRC

Post by tech62 » Fri Jan 19, 2018 6:43 am

Thanks for the reply.
As a follow up question...I am wishing to be able to view the baseband "message" signals on the carrier with a scope attached to the RP DAC outputs.

In the screenshots attached (which is a modified I am attempting to place a simple sinusoid at 2kHz onto the carrier at 600kHz...and was hoping to view these 600+/-1kHz signals via an external scope FFT.

What am I doing wrong such that I cannot see any effect on the output signals with my scope ?
I would like to be able to confirm that the baseband signals from GRC are indeed present on the carrier output from RP.

I can hear the AM on the receiver just fine.

Thanks for any help. I am running GRC on Linux Mint.
Screenshot from 2018-01-19 16_18_04.png
Screenshot from 2018-01-19 16_19_52.png
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