Re: BladeRF 2.0 Micro - Using Bias Tees with GRC

[Marcus D. Leech]

On 08/10/2020 01:49 PM, Alex Batts wrote:
> Hello all,
>
> I am wondering if anyone that has used the bladeRF 2.0 micro with the 
> bias tees was able to keep the bias tees enabled once executing a GRC 
> flowgraph. I am able to enable the bias tees with the bladeRF-cli 
> commands, but once I execute a GRC flowgraph they become disabled.
>
> Note: I recognize this is not exactly the best question for these 
> forums, but I have tried contacting Nuand four times over the last 
> week and a half, both through phone and email, and I have tried 
> posting to their forums (any forum post has to be approved by a 
> moderator), and I have had no luck with any of the attempts. So I was 
> wondering if anyone else on here has had a similar experience and 
> solved their issue.
>
> I'm running Ubuntu 20 on an RPi4 8GB.
>
> Thank you in advance,
>
> Alex
Given that Gnu Radio creates a brand-new session with the device, it's 
not surprising to me that "device init" turns off the bias-T.

But I'll note that the gr-osmosdr driver for BladeRF includes a 
"biastee" device argument, which if present turns on the bias tee.