Questions about 4CH PocketSDR

[MayHarryWang]

Dear Dr. tomojitakasu,

Recently, I bought a 4CH PocketSDR and couldn't wait to use it in my project. I’m eager to improve the solution, so I have some questions regarding its future development:

1. For post-process analysis, is it possible to dump 4-channel I-Q data using pocket_dump?

2. I plan to buy a Raspberry Pi 5 to connect with the 4CH PocketSDR; however, have you ever tried dumping the 4-channel I-Q data using the USB-C port on the Raspberry Pi?

3. Additionally, I want to integrate the PocketSDR and IMU with a Raspberry Pi. However, time synchronization between the two devices is an issue that needs to be solved. Ideally, is it possible to capture the GPS time via the PocketSDR and timestamp the raw data from the IMU?

Thank you very much.
Looking forward to your reply.

Best regards.

[tomojitakasu]

1. Yes. I recommend to use -r option to reduce the dump data size.
2. The USB-C port on Ras Pi 4/5 is dedicated to power supply. So you have to connect the FE to the USB-A (3.0) port. I have tested Ras Pi 4/5 connecting FE 4CH with 24 Msps sampling (-r option) and a USB3 SSD. Please take care the throughput of the external drive. The 24Msps sampling needs at least continuous 48 MB/s writing throughput for the drive.
3. Yes but a little hard. The current Pocket SDR has no function to synchronize GPS time and OS time. You may need to modify the code.