[stevecrm]

For reference these are my capture settings

`bb_api.bbConfigureCenterSpan(id, 70000000, 4.0e6); //center hz, span hz
bb_api.bbConfigureLevel(id, -20.0, bb_api.BB_AUTO_ATTEN);
bb_api.bbConfigureGain(id, bb_api.BB_AUTO_GAIN);
bb_api.bbConfigureIQ(id, bb_api.BB_MIN_DECIMATION, 4.0e6); //bandwidth hz

• This reply was modified 8 years ago by stevecrm.

[stevecrm]

When I pull IQ samples are they already shifted down to baseband? For instance when I sample my 70MHz signal at 40Msamp/s I believe I should have 27MHz of instantaneous bandwidth. Has that 27MHz around 70MHz been shifted to 27MHz around 0Hz?

[stevecrm]

Thanks for the quick response!

I realize there’s a lot more than just plotting the samples, first of all my signal is 1.86Msym/s and I pulled points at 40, so there’s some intense re sampling needed.

Before going through with the rest of the work I was concerned about how low my samples were compared to the stated range.

Either way it’s going to be fun to try! It’s one of those things I had a textbook knowledge of, going to be fun actually try coding it!

Thanks for the link!!

[stevecrm]

I’ve attached a picture of the data I got from my capture

Attachments:

You must be logged in to view attached files.

[Author]

Posts