# Two-channel RX with LimeSDR and LimeSuiteNG

**URL:** <https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079>\
**Category:** LimeSDR\
**Created:** [23 March 2026 21:56 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079 "2026-03-23T21:56:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Piero](https://avatars.discourse-cdn.com/v4/letter/p/b5e925/32.png) [@Piero](https://discourse.myriadrf.org/u/Piero)\
**Post date:** [23 March 2026 21:56 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/1 "2026-03-23T21:56:58Z")

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Hi, I would like to use my LimeSDR to receive simultaneously two RF signals, in order to implement a Direction-of-Arrival algorithm. How can I configure the “LimeSuiteNG Source” GRC block to receive the two signals?

Thank you in advance

Piero

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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:** [24 March 2026 05:39 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/2 "2026-03-24T05:39:20Z")

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You can set block’s “Data channel indexes” : [0,1]

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**Author:** ![Piero](https://avatars.discourse-cdn.com/v4/letter/p/b5e925/32.png) [@Piero](https://discourse.myriadrf.org/u/Piero)\
**Post date:** [27 March 2026 10:33 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/3 "2026-03-27T10:33:14Z")

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Thank you a lot, Ricardas! Thanks to your reply, I was able to run a two-channel receiver.I keep noticing some strange behavior: when I send two identical signals (same phase) to both RX inputs, I notice that the phase of channel 1 is sometimes +90° relative to channel 0 and sometimes -90°. I would expect the phase difference to always be 0°. What is the reason for this strange phenomenon?

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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:** [27 March 2026 20:30 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/4 "2026-03-27T20:30:24Z")

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I don’t know, that’s outside of my expertise, it’s not software related.

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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:** [30 March 2026 10:28 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/5 "2026-03-30T10:28:08Z")

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@VytautasB any thoughts on this?

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**Author:** ![VytautasB](https://avatars.discourse-cdn.com/v4/letter/v/ccd318/32.png) [@VytautasB](https://discourse.myriadrf.org/u/VytautasB)\
**Post date:** [30 March 2026 10:55 UTC](https://discourse.myriadrf.org/t/two-channel-rx-with-limesdr-and-limesuiteng/13079/6 "2026-03-30T10:55:00Z")

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Hi,

you can find some useful info in this post:

> [@Align phase](https://discourse.myriadrf.org/t/align-phase/6975):
>
> I just begin to learn SDR. I try to use one channel of tx and rx, but I don’t know how to using C++ to align phase for RX.

Regards,

Vytautas