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


From: khalid.el-darymli
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX
Date: Tue, 6 Jan 2015 13:52:17 -0330

Thanks Marcus for your reply.

>> 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.


So, ~ +7dBm is the max output power I supposed to get from the LFTX daughterboard? How do I get that?

Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard?


Khalid






Message: 2
Date: Tue, 6 Jan 2015 10:13:45 -0330
From: "khalid.el-darymli" <address@hidden>
To: "address@hidden" <address@hidden>
Subject: [Discuss-gnuradio] Max Output Power from the LFTX
        daughterboard
Message-ID:
        <CACdmG=zCHATiwrtv=wBVLwG0_
5GQr0y=address@hidden>
Content-Type: text/plain; charset="utf-8"

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
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Message: 3
Date: Tue, 06 Jan 2015 08:48:08 -0500
From: "Marcus D. Leech" <address@hidden>
To: address@hidden
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX
        daughterboard
Message-ID: <address@hidden>
Content-Type: text/plain; charset=UTF-8; format=flowed

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

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