# System Development

**URL:** https://discourse.myriadrf.org/c/system-development/6.md

[Latest](https://discourse.myriadrf.org/latest.md) · [Categories](https://discourse.myriadrf.org/categories.md)

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## [About the System Development category](https://discourse.myriadrf.org/t/about-the-system-development-category/31)

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**Author:** [@system](https://discourse.myriadrf.org/u/system)\
**Replies:** 0

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## [LimeSDR Mini v1.2 streaming fails (“No samples or timeout”), v1.3 PLL setup fails on old gateware](https://discourse.myriadrf.org/t/limesdr-mini-v1-2-streaming-fails-no-samples-or-timeout-v1-3-pll-setup-fails-on-old-gateware/13350)

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**Author:** [@jbracken05](https://discourse.myriadrf.org/u/jbracken05)\
**Replies:** 3\
**Last updated:** [20 October 2026 06:02 UTC](https://discourse.myriadrf.org/t/limesdr-mini-v1-2-streaming-fails-no-samples-or-timeout-v1-3-pll-setup-fails-on-old-gateware/13350 "2026-10-20T06:02:10Z")

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Hey all, I got two LimeSDR Minis going on LimeSuiteNG (built from source, Windows 11) and I’m stuck on two different problems. Would appreciate any help. Setup: Win11, LimeSuiteNG built from source off the develop bran…

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## [LMS7002M Package Delay](https://discourse.myriadrf.org/t/lms7002m-package-delay/13336)

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**Author:** [@mzampach](https://discourse.myriadrf.org/u/mzampach)\
**Replies:** 0\
**Last updated:** [17 September 2026 16:37 UTC](https://discourse.myriadrf.org/t/lms7002m-package-delay/13336 "2026-09-17T16:37:11Z")

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Hi, is there any information on the time of flight delay or routing length within the package? I’m currently routing my RF and BB and need to take these delays into account for the best phase matching on these pairs.

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## [LMS7002M Package Thermal Resistance](https://discourse.myriadrf.org/t/lms7002m-package-thermal-resistance/13300)

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**Author:** [@mzampach](https://discourse.myriadrf.org/u/mzampach)\
**Replies:** 4\
**Last updated:** [2 September 2026 15:21 UTC](https://discourse.myriadrf.org/t/lms7002m-package-thermal-resistance/13300 "2026-09-02T15:21:38Z")

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Hi all, I’m working on a system design and thermals are a concern with the LMS7002M’s commercial temperature range. First question: is the -40°C - 85°C temperature range ambient or junction? To ensure we stay under TJm…

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## [LMS7002M sleep current](https://discourse.myriadrf.org/t/lms7002m-sleep-current/13070)

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**Author:** [@zond](https://discourse.myriadrf.org/u/zond)\
**Replies:** 0\
**Last updated:** [12 March 2026 12:45 UTC](https://discourse.myriadrf.org/t/lms7002m-sleep-current/13070 "2026-03-12T12:45:53Z")

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Hello, I’m very interested in the LMS7002M chip, but I want to build a device where the radio sleeps the majority of the time. Does anyone know what sleep modes it supports, their wake up times, and their power draw? B…

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## [Measuring RF Power on the Lime SDR XTRX TX](https://discourse.myriadrf.org/t/measuring-rf-power-on-the-lime-sdr-xtrx-tx/13037)

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**Author:** [@Istacon](https://discourse.myriadrf.org/u/Istacon)\
**Replies:** 1\
**Last updated:** [9 February 2026 11:32 UTC](https://discourse.myriadrf.org/t/measuring-rf-power-on-the-lime-sdr-xtrx-tx/13037 "2026-02-09T11:32:19Z")

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I’m interested in a description of the precise method for measuring the Lime SDR XTRX TX output power to confirm its specifications (0-10 dBm). The frequency range of interest is 2000-2800 MHz. For the test harmonic sign…

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## [Clock generator is sometimes not locking correct](https://discourse.myriadrf.org/t/clock-generator-is-sometimes-not-locking-correct/13028)

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**Author:** [@alex\_nagel](https://discourse.myriadrf.org/u/alex_nagel)\
**Replies:** 1\
**Last updated:** [1 February 2026 08:13 UTC](https://discourse.myriadrf.org/t/clock-generator-is-sometimes-not-locking-correct/13028 "2026-02-01T08:13:56Z")

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hi, we have a problem with our LMS7002M. we observed that the internal clock generator PLL sometimes is not locking. this is seen on aprox. 1/10 chips. is this a known problem? is there any workaround? thanks for yo…

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## [Measuring RF RSSI on LMS7002M](https://discourse.myriadrf.org/t/measuring-rf-rssi-on-lms7002m/8879)

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**Author:** [@KMichaelides](https://discourse.myriadrf.org/u/KMichaelides)\
**Replies:** 0\
**Last updated:** [8 July 2025 08:46 UTC](https://discourse.myriadrf.org/t/measuring-rf-rssi-on-lms7002m/8879 "2025-07-08T08:46:29Z")

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What is the procedure for calibrating and measuring the RF RSSI on the LMS7002M, which is connected to the wideband input before the pre-amp? I want to check this value to ensure that the pre-amp is not getting saturated…

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## [LimeSDR Mini 2.4 Receiver Gain](https://discourse.myriadrf.org/t/limesdr-mini-2-4-receiver-gain/8857)

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**Author:** [@GLen](https://discourse.myriadrf.org/u/GLen)\
**Replies:** 3\
**Last updated:** [20 June 2025 18:53 UTC](https://discourse.myriadrf.org/t/limesdr-mini-2-4-receiver-gain/8857 "2025-06-20T18:53:47Z")

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Hi, I am new to the LimeSDR Mini 2.4. I just got the board operational and have it running on the SDR Console 3.3 and also on SatDump. Testing the board on 162.400 NOAA Radio, I have been comparing the signals to one of …

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## [LMS7200M Programming and Calibration Guide missing](https://discourse.myriadrf.org/t/lms7200m-programming-and-calibration-guide-missing/8849)

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**Author:** [@destevez](https://discourse.myriadrf.org/u/destevez)\
**Replies:** 1\
**Last updated:** [5 June 2025 08:31 UTC](https://discourse.myriadrf.org/t/lms7200m-programming-and-calibration-guide-missing/8849 "2025-06-05T08:31:53Z")

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Hi, The LMS7200M Programming and Calibration Guide, which is linked from Lime Microsystems | LMS7002M (https://cdn.sanity.io/files/yv2p7ubm/production/de8fd825eebc6fa2e4d1fa51fd7d8a66f39734d1.pdfation-Guide-v31r05.pdf) …

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## [Receiver input return loss and S-parameters](https://discourse.myriadrf.org/t/receiver-input-return-loss-and-s-parameters/8824)

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**Author:** [@dtatum](https://discourse.myriadrf.org/u/dtatum)\
**Replies:** 0\
**Last updated:** [23 May 2025 17:12 UTC](https://discourse.myriadrf.org/t/receiver-input-return-loss-and-s-parameters/8824 "2025-05-23T17:12:41Z")

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Is s-parameter data available for the LMS7002M differential RF ports? The documentation reflects poor return loss conditions from pages 21-127, and I’m curious if this data has been updated?

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## [LimeXTRX Bandwidth and Sampling Frequency Configuration Options](https://discourse.myriadrf.org/t/limextrx-bandwidth-and-sampling-frequency-configuration-options/8817)

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**Author:** [@chilchil](https://discourse.myriadrf.org/u/chilchil)\
**Replies:** 0\
**Last updated:** [20 May 2025 10:56 UTC](https://discourse.myriadrf.org/t/limextrx-bandwidth-and-sampling-frequency-configuration-options/8817 "2025-05-20T10:56:04Z")

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Hi all, Just a question about the bandwidth and sampling rate. It was claimed on page Lime Microsystems | LimeSDR XTRX that the BW can be up to 120MHz with sampling frequency up to 120MSPS complex sampling. However, on…

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## [Direct sampling on XTRX?](https://discourse.myriadrf.org/t/direct-sampling-on-xtrx/8609)

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**Author:** [@sdruser256](https://discourse.myriadrf.org/u/sdruser256)\
**Replies:** 2\
**Last updated:** [24 February 2025 20:41 UTC](https://discourse.myriadrf.org/t/direct-sampling-on-xtrx/8609 "2025-02-24T20:41:21Z")

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I’d like to use the 15 pin FPC connectors on the XTRX to access the ADCs and DACs directly, for 4 channels of direct RX and TX. I see that there are some flags to configure in the LMS7002M in order to route signal from …

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## [Development branch selection](https://discourse.myriadrf.org/t/development-branch-selection/8635)

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**Author:** [@aardric](https://discourse.myriadrf.org/u/aardric)\
**Replies:** 1\
**Last updated:** [23 January 2025 21:27 UTC](https://discourse.myriadrf.org/t/development-branch-selection/8635 "2025-01-23T21:27:28Z")

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This is perhaps a naive question but I am setting up an environment for testing and evaluating the XTRX as LimesuiteNG undergoes development. One of the features that interest me is the gr-limesuiteng plugin. I assume th…

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## [Lime SDR mini ver 2.4](https://discourse.myriadrf.org/t/lime-sdr-mini-ver-2-4/8567)

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**Author:** [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Replies:** 5\
**Last updated:** [20 November 2024 10:36 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-ver-2-4/8567 "2024-11-20T10:36:08Z")

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I noticed the hardware files stop at version 2.2, Is there somewhere I can find the same files, but for version 2.4?

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## [XTRX custom gateware for Artix-7](https://discourse.myriadrf.org/t/xtrx-custom-gateware-for-artix-7/8542)

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**Author:** [@dheeraj](https://discourse.myriadrf.org/u/dheeraj)\
**Replies:** 2\
**Last updated:** [24 October 2024 12:49 UTC](https://discourse.myriadrf.org/t/xtrx-custom-gateware-for-artix-7/8542 "2024-10-24T12:49:41Z")

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Hi, I am working on a modular communication module into which we are considering adding in the LimeSDR XTRX. This module is being developed in a standalone mode and therefore the use of a laptop or any system is not gua…

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## [Issue with Lime AC Case and LimeSDR Mini v2](https://discourse.myriadrf.org/t/issue-with-lime-ac-case-and-limesdr-mini-v2/8489)

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**Author:** [@midnight](https://discourse.myriadrf.org/u/midnight)\
**Replies:** 5\
**Last updated:** [23 September 2024 10:33 UTC](https://discourse.myriadrf.org/t/issue-with-lime-ac-case-and-limesdr-mini-v2/8489 "2024-09-23T10:33:10Z")

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bought two cases along with two lime mini sdr v2. Here are the issues with the case: THe bottom plate does not close due to a metal tab The fan does not start when the case + lime sdr are plugged into USB (I did solder…

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## [LimeSuiteNG Support for C programs](https://discourse.myriadrf.org/t/limesuiteng-support-for-c-programs/8302)

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**Author:** [@DaveG8GKQ](https://discourse.myriadrf.org/u/DaveG8GKQ)\
**Replies:** 10\
**Last updated:** [2 June 2024 18:23 UTC](https://discourse.myriadrf.org/t/limesuiteng-support-for-c-programs/8302 "2024-06-02T18:23:00Z")

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I have a suite of C programs (such as LimeSDR BandViewer - ) that run on a Raspberry Pi 4 using LimeSuite. I am trying to migrate these programs to use LimeSuiteNG, but cannot find a C-compatible header file. Many …

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## [LMS7002M initialization sequance](https://discourse.myriadrf.org/t/lms7002m-initialization-sequance/8317)

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**Author:** [@konradb3](https://discourse.myriadrf.org/u/konradb3)\
**Replies:** 3\
**Last updated:** [30 May 2024 16:22 UTC](https://discourse.myriadrf.org/t/lms7002m-initialization-sequance/8317 "2024-05-30T16:22:53Z")

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I am developing custom FPGA load for LimeSDR MiniV2. General project idea is to create standalone handheld SDR radio based on LMS7002M and STM32 micro controller (like portapack for HackRF). I am using GPIO pins of Lim…

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## [Custom dual input for one LimeSDR on GQRX](https://discourse.myriadrf.org/t/custom-dual-input-for-one-limesdr-on-gqrx/8258)

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**Author:** [@Belsarn](https://discourse.myriadrf.org/u/Belsarn)\
**Replies:** 3\
**Last updated:** [27 March 2024 19:32 UTC](https://discourse.myriadrf.org/t/custom-dual-input-for-one-limesdr-on-gqrx/8258 "2024-03-27T19:32:18Z")

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Greetings, For a student capstone project we are trying to complete a project on an VHF/UHF and S-BAND reception using two antennas, for the S-BAND part we acquird a dish antenna but our goal was to receive data from du…

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## [LimeSDR mini on RaspbianOS bookworm](https://discourse.myriadrf.org/t/limesdr-mini-on-raspbianos-bookworm/8213)

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**Author:** [@rush](https://discourse.myriadrf.org/u/rush)\
**Replies:** 5\
**Last updated:** [26 February 2024 18:38 UTC](https://discourse.myriadrf.org/t/limesdr-mini-on-raspbianos-bookworm/8213 "2024-02-26T18:38:13Z")

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Hi there, what is the current way to install all the software to get the LimeSDR mini to work? Adding the myriadrf ppa doesn’t anymore work like described in this post: I simply want to use the LimeSDR together with …

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## [LMS7002M MCU Source code](https://discourse.myriadrf.org/t/lms7002m-mcu-source-code/8198)

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**Author:** [@lenos](https://discourse.myriadrf.org/u/lenos)\
**Replies:** 5\
**Last updated:** [21 February 2024 12:21 UTC](https://discourse.myriadrf.org/t/lms7002m-mcu-source-code/8198 "2024-02-21T12:21:16Z")

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Hi everyone! We would like to compile the source code for the LMS7002M MCU and generate its HEX file, as we would like to modify it slightly in order to add a DC offset calibration. Could you please point us to the sou…

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## [Anyone using CMSIS-DSP for ARM?](https://discourse.myriadrf.org/t/anyone-using-cmsis-dsp-for-arm/8181)

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**Author:** [@VelekHacks](https://discourse.myriadrf.org/u/VelekHacks)\
**Replies:** 0\
**Last updated:** [25 January 2024 02:39 UTC](https://discourse.myriadrf.org/t/anyone-using-cmsis-dsp-for-arm/8181 "2024-01-25T02:39:34Z")

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Since my ultimate target is ARM, I was checking this out.

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## [XTRX SBC suggestions 2-Lane PCIe](https://discourse.myriadrf.org/t/xtrx-sbc-suggestions-2-lane-pcie/8075)

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**Author:** [@dkushagra](https://discourse.myriadrf.org/u/dkushagra)\
**Replies:** 0\
**Last updated:** [21 October 2023 12:33 UTC](https://discourse.myriadrf.org/t/xtrx-sbc-suggestions-2-lane-pcie/8075 "2023-10-21T12:33:28Z")

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Can somebody suggest what would be an ideal Single board computer for development with the new XTRX SDR, ideally powerful enough to support the full bandwidth of the XTRX. Is there anything available that has Mini-PCIe w…

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## [Is the block diagram right or wrong?](https://discourse.myriadrf.org/t/is-the-block-diagram-right-or-wrong/4213)

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**Author:** [@huangdeyong123](https://discourse.myriadrf.org/u/huangdeyong123)\
**Replies:** 1\
**Last updated:** [14 June 2023 11:39 UTC](https://discourse.myriadrf.org/t/is-the-block-diagram-right-or-wrong/4213 "2023-06-14T11:39:13Z")

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Hello all, I found in the CDS Control Diagram , the MCLK2 clock on the pad is connected with mclk1 port of LML Module, While the MCLK1 clock on the pad is connected with mclk2 port of LML Module, Are these connecti…

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## [Just USB interface drivers](https://discourse.myriadrf.org/t/just-usb-interface-drivers/7891)

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**Author:** [@pietrodcs](https://discourse.myriadrf.org/u/pietrodcs)\
**Replies:** 5\
**Last updated:** [17 April 2023 10:58 UTC](https://discourse.myriadrf.org/t/just-usb-interface-drivers/7891 "2023-04-17T10:58:23Z")

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Good morning I need to arrange a data logger. I will use for now windows. I need to initialize the transmitter and the receiver with some proper frequency and send a limited amount of data. My question is what to look…

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## [What is the address of LMS7002's internal SRAM](https://discourse.myriadrf.org/t/what-is-the-address-of-lms7002s-internal-sram/7882)

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**Author:** [@wieniawski](https://discourse.myriadrf.org/u/wieniawski)\
**Replies:** 1\
**Last updated:** [10 March 2023 13:04 UTC](https://discourse.myriadrf.org/t/what-is-the-address-of-lms7002s-internal-sram/7882 "2023-03-10T13:04:37Z")

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In datasheet, it said that there is an on chip microcontroller, which has a 18K SRAM(16K for program, 2K for work). And it is mentioned that the program can be downloaded from external BB processor to SRAM. My question …

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## [How to develop ZIF TX in LMS7002M](https://discourse.myriadrf.org/t/how-to-develop-zif-tx-in-lms7002m/7883)

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**Author:** [@wieniawski](https://discourse.myriadrf.org/u/wieniawski)\
**Replies:** 0\
**Last updated:** [10 March 2023 09:07 UTC](https://discourse.myriadrf.org/t/how-to-develop-zif-tx-in-lms7002m/7883 "2023-03-10T09:07:07Z")

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hi, all, As it mentioned that, BB also send IQ data to LMS7002M. However, probably TX is modulated BB data directly to carrier, then probably there is only one path data instead of IQ. How can I do at this time? sen…

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## [Best way of starting RX stream from PPS](https://discourse.myriadrf.org/t/best-way-of-starting-rx-stream-from-pps/7804)

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**Author:** [@TimBat](https://discourse.myriadrf.org/u/TimBat)\
**Replies:** 1\
**Last updated:** [11 January 2023 06:41 UTC](https://discourse.myriadrf.org/t/best-way-of-starting-rx-stream-from-pps/7804 "2023-01-11T06:41:51Z")

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I wish to have RX stream start based on PPS signal, is it possible to deassert LMS\_RXEN and then assert it triggered from the PPS on a gpio ? Does this complicate setup as all registers are lost ? Or intercept the data…

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## [Transmitting and Receiving NBFM using a Software Defined Radio](https://discourse.myriadrf.org/t/transmitting-and-receiving-nbfm-using-a-software-defined-radio/7767)

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**Author:** [@RightHalfPlane](https://discourse.myriadrf.org/u/RightHalfPlane)\
**Replies:** 0\
**Last updated:** [14 November 2022 20:22 UTC](https://discourse.myriadrf.org/t/transmitting-and-receiving-nbfm-using-a-software-defined-radio/7767 "2022-11-14T20:22:22Z")

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I have seen this question ask here several times with no real answers. This video demonstrates two C++ programs that send and receive Narrow Band FM using routines from SoapySDR, rtAudio, and liquidSDR. Transmitting an…

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