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From: | khalid.el-darymli |
Subject: | Re: [Discuss-gnuradio] Max Output Power from the LFTX |
Date: | Tue, 6 Jan 2015 14:29:47 -0330 |
Output power is determined largely by baseband signal magnitude in that case.Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard?Thanks Marcus for your reply.>> The LF/BASIC series have *no* gain in either path, so you're just looked
>> Probably somewhere in the neighborhood of +7dBm, maybe a little more.
at buffered ADC ouput.
So, ~ +7dBm is the max output power I supposed to get from the LFTX daughterboard? How do I get that?
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>
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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
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>
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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
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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