# Lime SDR mini 2.0 with LimeSuite GUI for 1MHZ-30MHz TX

**URL:** <https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771>\
**Category:** LimeSDR\
**Created:** [16 April 2025 21:54 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771 "2025-04-16T21:54:56Z")\
**Posts on this page:** 10\
**Page:** 1

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [16 April 2025 21:54 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/1 "2025-04-16T21:54:56Z")

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![image](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/8/8de9696b88bc36829ba79f07d14964cd96f753c8.jpeg)  
Is there anything in the hardware path I should remove to use a carrier frequency that low? Maybe short C11?

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [17 April 2025 08:17 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/2 "2025-04-17T08:17:21Z")

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Tagging @Karolis.

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [17 April 2025 17:24 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/3 "2025-04-17T17:24:05Z")

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can I use Lime Suite GUI to TX on the HF bands? How do I go about setting to something like 20MHz TX?

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**Author:** ![ricardas](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/ricardas/32/86_2.png) [@ricardas](https://discourse.myriadrf.org/u/ricardas)\
**Post date:** [17 April 2025 18:11 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/4 "2025-04-17T18:11:31Z")

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Just from configuration perspective, 30MHz is the lowest that the LMS7002M local oscillator can be set, to achieve lower frequencies, the sampling rate has to be appropriately increased, and a digital numerically controlled oscillator has to be configured to downconvert the signal to your desired frequency.

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [17 April 2025 18:16 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/5 "2025-04-17T18:16:04Z")

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I see the NCO in the lime suite GUI tool. If I go to the TxTSP tab and set the FCM(MHZ) to -10.0 and upload NCO that does seem to shift things. Am I missing anything else?

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**Author:** ![ricardas](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/ricardas/32/86_2.png) [@ricardas](https://discourse.myriadrf.org/u/ricardas)\
**Post date:** [17 April 2025 18:18 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/6 "2025-04-17T18:18:48Z")

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The NCO can shift only up to half of the sampling rate, so sampling rate should be set first, and then the NCO configured.

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [17 April 2025 18:25 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/7 "2025-04-17T18:25:41Z")

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Where in the LimeSuite GUI do I shift the sampling rate, exactly?

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**Author:** ![ricardas](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/ricardas/32/86_2.png) [@ricardas](https://discourse.myriadrf.org/u/ricardas)\
**Post date:** [17 April 2025 18:40 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/8 "2025-04-17T18:40:53Z")

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Just to clarify what is your expected use case?  
You want to configure the transmitter for desired frequency and simply transmit raw samples from a file? Or are you expecting to do that in some other software package?

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [17 April 2025 18:52 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/9 "2025-04-17T18:52:39Z")

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You want to configure the transmitter for desired frequency and simply transmit raw samples from a file?  
Correct. I have a 20MHz QPSK signal I want to play over and over where Fc will be 20MHz. I use the Modules-\>FPGA controls to play my waveform file.

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**Author:** ![skorphi](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@skorphi](https://discourse.myriadrf.org/u/skorphi)\
**Post date:** [17 April 2025 19:22 UTC](https://discourse.myriadrf.org/t/lime-sdr-mini-2-0-with-limesuite-gui-for-1mhz-30mhz-tx/8771/10 "2025-04-17T19:22:38Z")

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I think I got it actually.  
Setting clkgen to 30MHz and CLKH\_OV\_CLKL to 1, in SXT setting the VCO to 30MHz and in TxTSP setting interpolation to bypass and NCO to -10 seem to do it!  
I guess the hardware can handle the signal but its about 8dB less output power, so I adjusted the TXPad to compensate.  
Thanks!