122-16, 384khz bw and sdr_receiver_hpsdr_122_88

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F4HTB
Posts: 8
Joined: Tue Jul 04, 2017 10:46 am

122-16, 384khz bw and sdr_receiver_hpsdr_122_88

Post by F4HTB » Mon Mar 21, 2022 1:47 pm

Hello Dear all,

I try to use pavel-demin /red-pitaya-notes, sdr_receiver_hpsdr_122_88 projects with my redpitaya 122-16.

It's connected to my dl380 server with dedicated network card.
On client side on this server i use gr-hpsdr https://github.com/Tom-McDermott/gr-hpsdr and a dev based on gr-hpsdr: https://github.com/F4HTB/hpsdr2alsaconnector

It's for send rx i/q in some alsa loopback.
I have compile linux kernels up to 384khz for alsa loopback.

When i use with 7receivers in 192khz all is okey.
When i try to use more than 3 receivers in 384khz, I am encountering some underrun.

By searching, I wonder if i have some hardare problème or limitation.

If I just do the calculation 7*192khz ~ 3.5*384khz. This simple approach allows me to confirm what I see is 3 * 384khz works.
What confuses me is that my redpitaya 122-14 works in 384khz up to 6rx without problem.

If someone have an idea?

https://github.com/pavel-demin/red-pita ... er-hpsdr.c

Many thanks in advance.
PS: I have set this post in Software section but i dont no if it's a software or hardware problem.

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