Send USRP-users mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of USRP-users digest..."
Today's Topics:
1. Noise Floor issue? ([email protected])
2. Re: Noise Floor issue? (Tim Newman)
----------------------------------------------------------------------
Message: 1
Date: Sat, 28 Apr 2012 20:46:59 +1200
From: "[email protected]" <[email protected]>
To: [email protected]
Subject: [USRP-users] Noise Floor issue?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
I have two N200 with SBX and have a similar antenna on both units and am
running uhd_fft with parms :
uhd_fft -s 2e6 -f .804e9 -a addr=192.168.n0.2 -g 30
as you can see from the screenshot, the analogue tv sound channel at
804.75 MHz is observable in both FFTs but the noise floor appears to be
quite a bit higher in ..20.2 than in 10.2 ( the latter has a GPSDO ) by
~ 25 "dB"
When I switch the antennas over, the issue remains.
When I moved the DB to a USRP1, I get the 2nd-screen_shot. This might
imply there is an issue with the base N200?
Any ideas about what might be wrong?
Kind Regards,
John
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20120428/784e2eee/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SBX on 2 N200.jpg
Type: image/jpeg
Size: 242410 bytes
Desc: not available
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20120428/784e2eee/attachment-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 1 SBX on 'good' N200 and other on USRP1
Type: image/jpeg
Size: 279317 bytes
Desc: not available
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20120428/784e2eee/attachment-0001.jpe>
------------------------------
Message: 2
Date: Sat, 28 Apr 2012 07:37:58 -0400
From: Tim Newman <[email protected]>
To: "[email protected]" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Noise Floor issue?
Message-ID:
<cakbqcwqhtonuysap0rrpfpo2ivdoyq5m2rzwycxd0t--nfx...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I believe there was a bug that was fixed the the 003.004.000 release
firmware. Which firmware are you running?
Tim
On Saturday, April 28, 2012, [email protected] wrote:
> I have two N200 with SBX and have a similar antenna on both units and am
> running uhd_fft with parms :
>
> uhd_fft -s 2e6 -f .804e9 -a addr=192.168.n0.2 -g 30
>
> as you can see from the screenshot, the analogue tv sound channel at
> 804.75 MHz is observable in both FFTs but the noise floor appears to be
> quite a bit higher in ..20.2 than in 10.2 ( the latter has a GPSDO ) by ~
> 25 "dB"
>
> When I switch the antennas over, the issue remains.
>
> When I moved the DB to a USRP1, I get the 2nd-screen_shot. This might
> imply there is an issue with the base N200?
>
> Any ideas about what might be wrong?
>
> Kind Regards,
>
> John
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20120428/3f47271d/attachment-0001.html>
------------------------------
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
End of USRP-users Digest, Vol 20, Issue 25
******************************************
