# Max Output Power from the LFTX daughterboard

**URL:** <https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728>\
**Category:** GNU Radio\
**Created:** [January 6, 2015, 2:44pm UTC](https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728 "2015-01-06T14:44:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [January 6, 2015, 2:44pm UTC](https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728/1 "2015-01-06T14:44:52Z")

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Hi,

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](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?

Thanks.

Best regards,  
Khalid

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<div class="post-metadata">

**Author:** ![khalide](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@khalide](https://www.ruby-forum.com/u/khalide)\
**Post date:** [January 6, 2015, 2:49pm UTC](https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728/2 "2015-01-06T14:49:13Z")

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On 01/06/2015 08:43 AM, khalid.el-darymli wrote:

> Best regards,  
> Khalid  
> 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 L.  
Principal Investigator  
Shirleys Bay Radio Astronomy Consortium

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