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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 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 01/06/2015 08:43 AM, khalid.el-darymli wrote:
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
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
http://www.sbrac.org