LimeSDR Levels Diagnostic

Diagnosing problems when LimeSDR TX/RX levels are reduced and/or different across A & B channels.

Check list

1. Are RF matching networks identical?
2. Are all A and B channel settings identical?
3. Has any RF matching changes been carried out?
4. Was proper ESD protection used?

Possible causes

• 6dB+/-1dB suggests damage to one LNA or TX pin
• >25dB suggests mechanical failure or catastrophic ESD event
• General numbers 3-15dB suggest mismatch in GUI settings or RF matching

Note that at higher frequencies, component tolerance on RF matching can cause a small gain mismatch, usually <3dB.

Reporting problems

1. Clearly state the exact difference in gain in dB and the frequency it was measured at
2. Provide details, including versions of:
   1. FPGA gateware and FX3 firmware
   2. Lime Suite
   3. Application software
3. Wherever possible supply a Lime Suite .ini file