# LimeSDR mini output power limited to ~ -20 dbm

**URL:** <https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528>\
**Category:** LimeSDR\
**Created:** [18 February 2022 18:17 UTC](https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528 "2022-02-18T18:17:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hsvh](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/hsvh/32/3976_2.png) [@hsvh](https://discourse.myriadrf.org/u/hsvh)\
**Post date:** [18 February 2022 18:17 UTC](https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528/1 "2022-02-18T18:17:40Z")

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Running a GNUradio generated pulse signal from LimeSDR mini directly to an oscilloscope (via USB-3 port & 50 ohm cable) and can’t get better than a 30 mV peak to peak signal… am around a 127 MHz RF signal, but changing center freq doesnt help.

Trying to figure out if I’m using wrong TX mode? Can i use LimeSuite to change the output mode?

Any other ideas for cause?

(sorry for choppy post- have a broken dominant hand.)

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**Author:** ![mfalkvidd](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/mfalkvidd/32/3147_2.png) [@mfalkvidd](https://discourse.myriadrf.org/u/mfalkvidd)\
**Post date:** [18 February 2022 21:40 UTC](https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528/2 "2022-02-18T21:40:38Z")

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That looks about right if you are using tx2. See graph at [LimeSDR’s maximum transmitting power at different frequencies - #2 by Karolis](https://discourse.myriadrf.org/t/limesdr-s-maximum-transmitting-power-at-different-frequencies/1649/2)

Tx1 should provide much more though.

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**Author:** ![hsvh](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/hsvh/32/3976_2.png) [@hsvh](https://discourse.myriadrf.org/u/hsvh)\
**Post date:** [19 February 2022 01:18 UTC](https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528/3 "2022-02-19T01:18:16Z")

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Do you know if it’s possible to switch to TX1 in GNUradio-companion or in the code? I read somewhere that if I change the TX mode in LimeSUITE and then switch to GNU it will just switch back to the default channel.

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**Author:** ![hsvh](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/hsvh/32/3976_2.png) [@hsvh](https://discourse.myriadrf.org/u/hsvh)\
**Post date:** [25 February 2022 17:08 UTC](https://discourse.myriadrf.org/t/limesdr-mini-output-power-limited-to-20-dbm/7528/4 "2022-02-25T17:08:23Z")

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As an update, I did not have the channel in the source block matching that of the .ini file. But it doesn’t seem to matter because I can’t calibrate the TX when I switch from channel A to B anyways. Not sure how it’s possible to switch channels using the LimeSDR mini at this point because it seems like it’s not possible to calibrate on anything but default settings.

[https://wiki.myriadrf.org/Gr-limesdr\_Plugin\_for\_GNURadio](https://wiki.myriadrf.org/Gr-limesdr_Plugin_for_GNURadio)

- **File** : Select .ini file which you configured and saved by using LimeSuiteGUI. This setting should match in LimeSuite Sink (TX) and LimeSuite Source (RX) blocks for the same device.