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Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard
Date: Tue, 06 Jan 2015 08:48:08 -0500
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On 01/06/2015 08:43 AM, khalid.el-darymli wrote:

What is the maximum output power from the LFTX daughterboard when used with the USRP N200?

According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf

In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm.

Is this the max power one can get out of the LFTX daughterboard?


Best regards,
Probably somewhere in the neighborhood of +7dBm, maybe a little more.

The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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