# LimeSDR-mini is not working properly as transmitter

**URL:** <https://discourse.myriadrf.org/t/limesdr-mini-is-not-working-properly-as-transmitter/3672>\
**Category:** LimeSDR\
**Created:** [16 November 2018 12:31 UTC](https://discourse.myriadrf.org/t/limesdr-mini-is-not-working-properly-as-transmitter/3672 "2018-11-16T12:31:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vinayak](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/vinayak/32/2738_2.png) [@vinayak](https://discourse.myriadrf.org/u/vinayak)\
**Post date:** [16 November 2018 12:31 UTC](https://discourse.myriadrf.org/t/limesdr-mini-is-not-working-properly-as-transmitter/3672/1 "2018-11-16T12:31:24Z")

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Hi all,

```
         I was trying to make a QPSK transmitter and receiver using LimeSDR mini at a center frequency of 2.2 GHz. But at the receiver end the constellation which i received was not QPSK and spread-ed widely. That means modulation at transmitter is not proper. I have used a HackRF One as transmitted the same GRC flowgraph and it was working well and at receiver i got good constellation as well as data. Why i am not able transmit the signal using limesdr mini?? Any special configuration is there to make it a transmitter ? The driver for limesdr mini looks not works well for this. My limeSDR mini is v1.2.

```

Somebody please help me for figuring it out… I have no choice to use other SDR because of the size constraints of my device.

Thanks & Regards,  
Vinayak

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**Author:** ![maschi01](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/maschi01/32/2278_2.png) [@maschi01](https://discourse.myriadrf.org/u/maschi01)\
**Post date:** [16 November 2018 14:27 UTC](https://discourse.myriadrf.org/t/limesdr-mini-is-not-working-properly-as-transmitter/3672/2 "2018-11-16T14:27:54Z")

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Can you supply a screenshot of the constellation it transmit/receives?

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**Author:** ![soma96be](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@soma96be](https://discourse.myriadrf.org/u/soma96be)\
**Post date:** [17 November 2018 09:45 UTC](https://discourse.myriadrf.org/t/limesdr-mini-is-not-working-properly-as-transmitter/3672/3 "2018-11-17T09:45:43Z")

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Even i am hit with same issues,while using limesdr mini.For transmitting using limesdr we need to know its entire hardware specifications of it when I disable the transmitter and receiver part of my block then the constellation is fine.