Hi All,
Just to update you in case somebody else comes across
this problem. Following Mike's advice, we replaced the
LFTX daughterboard with a new one. We're getting now 1
V p-p. This is around 4 dBm.
Thanks very much for your help.
Best regards,
Khalid
On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim
<mrah...@bu.edu <mailto:mrah...@bu.edu>> wrote:
Hi Khalid,
I had a similar issue with an LFTX that I had been
working with for about two years. I actually had
two boards running on separate USRP2's and both
were working fine for quite a while, but I recently
noticed that one had a drastically lower output
range. I ended up replacing the LFTX and all is
working well now, so I'm assuming it was a hardware
issue that came up at some point.
I didn't take the time to look for the problem, but
I figured I'd share this info since what you're
seeing might be a hardware issue rather than
something you can resolve with settings.
-Mike
On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli
<khalid.el-dary...@mun.ca
<mailto:khalid.el-dary...@mun.ca>> wrote:
>> Output power is determined largely by
baseband signal magnitude in that case.
Yes, I understand. And I noticed that for
baseband signal with an amplitude *> 1, * the
pass-band signal gets clipped off. So I assume
that an amplitude of 1 for the baseband signal
should deliver the maximum output power (for
the pass-band signal).
My question was, what is the maximum power one
can get for the pass-band signal output from
LFTX? In your earlier reply, you said it is
around +7dBm, am I getting this right? In my
case, for a baseband amplitude of around 1, I
am only getting *-28.13dBm*, much less than
what you said, I am not sure,*why?*
Thanks,
Khalid
On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech
<mle...@ripnet.com <mailto:mle...@ripnet.com>>
wrote:
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
Output power is determined largely by
baseband signal magnitude in that case.
Message: 2
Date: Tue, 6 Jan 2015 10:13:45 -0330
From: "khalid.el-darymli"
<khalid.el-dary...@mun.ca
<mailto:khalid.el-dary...@mun.ca>>
To: "Discuss-gnuradio@gnu.org
<mailto:Discuss-gnuradio@gnu.org>"
<discuss-gnuradio@gnu.org
<mailto:discuss-gnuradio@gnu.org>>
Subject: [Discuss-gnuradio] Max Output
Power from the LFTX
daughterboard
Message-ID:
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5GQr0y=wksequrcajrtuv5...@mail.gmail.com
<mailto:wksequrcajrtuv5...@mail.gmail.com>>
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" <mle...@ripnet.com
<mailto:mle...@ripnet.com>>
To: discuss-gnuradio@gnu.org
<mailto:discuss-gnuradio@gnu.org>
Subject: Re: [Discuss-gnuradio] Max Output
Power from the LFTX
daughterboard
Message-ID: <54abe798.5060...@ripnet.com
<mailto:54abe798.5060...@ripnet.com>>
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
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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