# Lime SDR USB low frequency carrier 990k problem

**URL:** <https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919>\
**Category:** LimeSDR\
**Created:** [2 February 2021 15:25 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919 "2021-02-02T15:25:04Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![LFA](https://avatars.discourse-cdn.com/v4/letter/l/b38774/32.png) [@LFA](https://discourse.myriadrf.org/u/LFA)\
**Post date:** [2 February 2021 15:25 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919/1 "2021-02-02T15:25:04Z")

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After some research, i can’t find a way through limesuite to change the frequency of the carrier to 990k. Can someone help me?

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**Author:** ![yt7pwr](https://avatars.discourse-cdn.com/v4/letter/y/ecd19e/32.png) [@yt7pwr](https://discourse.myriadrf.org/u/yt7pwr)\
**Post date:** [2 February 2021 22:22 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919/2 "2021-02-02T22:22:00Z")

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You want to receive or transmit on 990KHz? Can you give us more information?

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**Author:** ![N0YKG](https://avatars.discourse-cdn.com/v4/letter/n/3bc359/32.png) [@N0YKG](https://discourse.myriadrf.org/u/N0YKG)\
**Post date:** [3 February 2021 13:49 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919/3 "2021-02-03T13:49:29Z")

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The actual analog LO cannot go below 30MHz. If you want to operate lower than that, you have to use a wide bandwidth and high sample rate, and move your signal down to the desired frequency digitally.

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**Author:** ![LFA](https://avatars.discourse-cdn.com/v4/letter/l/b38774/32.png) [@LFA](https://discourse.myriadrf.org/u/LFA)\
**Post date:** [4 February 2021 12:55 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919/4 "2021-02-04T12:55:17Z")

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hi there,

I want to trasmit.

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**Author:** ![LFA](https://avatars.discourse-cdn.com/v4/letter/l/b38774/32.png) [@LFA](https://discourse.myriadrf.org/u/LFA)\
**Post date:** [4 February 2021 12:57 UTC](https://discourse.myriadrf.org/t/lime-sdr-usb-low-frequency-carrier-990k-problem/6919/5 "2021-02-04T12:57:41Z")

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hi there,

I will try that, thank you.