HackRF OP25 and DC Spike

[LubeckTech]

How do i getrid of or move the DC Spike in Hack RF??

I have tried messing with the -o command but when I add a numeric value It stops working so I am probably not using command correctly
Here is the command line I am starting with;
./rx.py --args 'hackrf' -N 'LNA:47' -S 25000 -f 774.43125e6 -o 17e3 -X
My goal is to see it decoding the control channel before I progress.
I an using John's Tech Blog page OP25 revisited to get started but am open to suggestions.

 

[LubeckTech]

My OS is Ubuntu 22.04

 

[boatbod]

Your sample rate (-S 25000) is way too low to work. I'm not overly familiar with HackRF sample rates, but in general with op25 you'll need at least 1Mhz or greater. In the following link they say HackRF needs at least 2Mhz sample rate. Sampling Rate and Baseband Filters — HackRF documentation

The offset command (-o 17e3) should work, and in this case would apply a 17kHz shift to avoid the dc spike.