Max Output Power from the LFTX daughterboard

GNU Radio
1

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

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

2

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