Hey folks,

The Knowledge Base webpage for the SBXs daughterboards [1] mentions that
their maximum output power is 100 mW (20 dBm), and that the transmit gains
range goes from 0 to 31.5 dB.

Does this mean 20 dBm is the power output when the gain is set to 31.5 dB?

Also, the X300 Starting Guide [2] mentions that you shouldn't apply more
than -15 dBm to any RF input. If I use 30 dB of attenuation in a loopback
configuration (actually, TX/RX from one X310 to RX2 of another), and
considering the answer to my last question is positive, would ~25 dB of TX
gain be the overall maximum value you can use?

Thanks in advance!

Leo

[1] https://kb.ettus.com/SBX
[2] https://kb.ettus.com/X300/X310_Getting_Started_Guides

Hello,

I wouldn't expect the full 20 dBm output power from the board, even when the board is at the 31.5 dB TX gain setting. Actual power level will depend on several other factors, including the center frequency that the board is tuned at. The power would be lower than 20 dBm in most scenarios.

That said, I would still use a relatively low TX gain power level when using loopback configurations, just to be on the safe side.

Regards,

Kyeong Su Shin

보낸 사람: Michael Don via USRP-users usrp-users@lists.ettus.com 대신 USRP-users usrp-users-bounces@lists.ettus.com
보낸 날짜: 2018년 11월 14일 수요일 오후 11:10:46
받는 사람: leoechevarria@gmail.com
참조: USRP-users@lists.ettus.com
제목: Re: [USRP-users] SBX-120 transmit power

I think the answers are yes and yes.

On Wed, Nov 14, 2018 at 6:46 AM Leandro Echevarría via USRP-users <usrp-users@lists.ettus.commailto:usrp-users@lists.ettus.com> wrote:
Hey folks,

The Knowledge Base webpage for the SBXs daughterboards [1] mentions that their maximum output power is 100 mW (20 dBm), and that the transmit gains range goes from 0 to 31.5 dB.

Does this mean 20 dBm is the power output when the gain is set to 31.5 dB?

Also, the X300 Starting Guide [2] mentions that you shouldn't apply more than -15 dBm to any RF input. If I use 30 dB of attenuation in a loopback configuration (actually, TX/RX from one X310 to RX2 of another), and considering the answer to my last question is positive, would ~25 dB of TX gain be the overall maximum value you can use?

Thanks in advance!

Leo

[1] https://kb.ettus.com/SBX
[2] https://kb.ettus.com/X300/X310_Getting_Started_Guides

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