jopohl/urh

LimeSDR on Low Frequencies

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#726 opened on Feb 12, 2020

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Description

Expected Behavior

Better control over GAIN for LimeSDR device (not mini). Please use example of the SDR Console Gain Control.

Actual Behavior

Signal really weak on the low frequencies even if GAIN is maximized.

Steps To Reproduce
  1. Go to URH
  2. Click on Spectrum Analyzer
  3. Refresh device, select sampling rate to 2.5M and Gain to above middle point (also tested maximum)
  4. See attached screenshots that signal that is strong on the Console is really weak on the URH even if Gain is cranked up to maximum.
Screenshots

Screenshot from Console showing LNA Gain and strong signal reception on RX1_L image

Signal on the URH image

Additional information about LimeSuite: image

Version information: Library version: v19.04.0-PothosSDR-2019.06.09-vc14-x64 Build timestamp: 2019-06-09 Interface version: v2019.1.0 Binary interface: 19.04-1

Please note that on URH there is no full control over all parameters of LimeSDR Gain.

Platform Specifications
  • OS: Windows 10
  • URH version: [e.g. 2.8.2]
  • Installed via installer

Additional Logs: LimeSDR-OPEN (LimeSDR-USB, media=USB 3.0, module=FX3, serial=XXXXXX, index=0): Success LimeSDR-INIT: Success LimeSDR-SET_CHANNEL_INDEX to 0: Success LimeSDR-SET_ANTENNA_INDEX to 3: Success LimeSDR-SET_FREQUENCY to 1000000.0: Success LimeSDR-SET_SAMPLE_RATE to 2000000.0: Success LimeSDR-SET_BANDWIDTH to 2000000.0: Success LimeSDR-SET_RF_GAIN to 0.91: Success LimeSDR: Current normalized gain is 0.90 LimeSDR: Current antenna is LNAW (I was testing with RX1L and RX1W) LimeSDR: Current chip temperature is 37.99°C LimeSDR: Initializing stream... LimeSDR-Initialize stream: Success LimeSDR: successfully started rx mode

Contributor guide

Tech stack
python
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
familiarity with LimeSDRPython programming
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue requests improved gain control for LimeSDR on low frequencies. To address this, examine the current gain implementation in the URH source code, particularly the LimeSDR backend in `src/urh/dev/grpc/limesdr.py`. Compare with LimeSDR's native API documentation to identify missing gain stages, such as LNA, PGA, and TIA. Then implement a solution that exposes these parameters in the URH interface, following the pattern of the existing gain slider.
LimeSDR on Low Frequencies · jopohl/urh#726 | Good First Issue