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Today's Topics:
1. GPSDO and MIMO (Dan Sego)
2. Re: GPSDO and MIMO (Mike Jameson)
3. KU Band Rx/Tx (hossein talaiee)
4. KU Band Rx/Tx (hossein talaiee)
5. Re: KU Band Rx/Tx (Marcus M?ller)
6. Re: Stepped Frequency Radar (Martin Braun)
7. Re: Full bandwidth streaming from X300 to disk (Martin Braun)
8. Re: GPSDO and MIMO (Martin Braun)
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Message: 1
Date: Sun, 30 Mar 2014 10:03:56 -0700
From: Dan Sego <[email protected]>
To: [email protected]
Subject: [USRP-users] GPSDO and MIMO
Message-ID:
<calgevjsajqzzgldxhxoxxx+0nmeuwo98fpdx3otzyyx4bwq...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Good morning all;
I would like to use a single GPSDO to provide the 10 MHz coherent reference
to two N200 chassis. As I read the data sheets it is unclear whether that
is supported via the MIMO cabling, or if there is an output from N200
number one (with internal GPSDO) to connect to the second N200 external
reference.
Advice, comments or suggestions, please.
Dan Sego
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Message: 2
Date: Sun, 30 Mar 2014 18:26:29 +0100
From: Mike Jameson <[email protected]>
To: Dan Sego <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] GPSDO and MIMO
Message-ID:
<cajcjmiqeqbafirjzbqw916zqau_ozh8nox2fsn6tpauoojq...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Dan,
The MIMO cable carries the 10MHz reference, 1PPS signal and network
traffic. If you use the UHD source/sink blocks in GRC you can select the
MIMO cable as the clock source for your second N200.
Cheers,
Mike
--
Mike Jameson M0MIK BSc MIET
Email: [email protected]
Web: http://scanoo.com
On Sun, Mar 30, 2014 at 6:03 PM, Dan Sego <[email protected]> wrote:
> Good morning all;
>
> I would like to use a single GPSDO to provide the 10 MHz coherent
> reference to two N200 chassis. As I read the data sheets it is unclear
> whether that is supported via the MIMO cabling, or if there is an output
> from N200 number one (with internal GPSDO) to connect to the second N200
> external reference.
>
> Advice, comments or suggestions, please.
>
> Dan Sego
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 3
Date: Sun, 30 Mar 2014 23:03:40 +0430
From: hossein talaiee <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] KU Band Rx/Tx
Message-ID:
<caaibebtn5qdeqzgxqbidxs7f2o9e1fap2gus7erzmk-t3od...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Can I use USRP for Rx/Tx in Ku band? Rx: 10.5 GHz and Tx : 14GHz ?
I think I can use a universal LNB + T-Bias for power for RX but what can
use for Tx?
Is there any cheap UCB for 14GHz band?
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Message: 4
Date: Sun, 30 Mar 2014 23:03:40 +0430
From: hossein talaiee <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] KU Band Rx/Tx
Message-ID:
<caaibebtn5qdeqzgxqbidxs7f2o9e1fap2gus7erzmk-t3od...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Can I use USRP for Rx/Tx in Ku band? Rx: 10.5 GHz and Tx : 14GHz ?
I think I can use a universal LNB + T-Bias for power for RX but what can
use for Tx?
Is there any cheap UCB for 14GHz band?
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Message: 5
Date: Sun, 30 Mar 2014 21:02:16 +0200
From: Marcus M?ller <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] KU Band Rx/Tx
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
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Hi Hossein,
as far as I'm aware of, the highest you can go with any of the Ettus RF
daughterboards is 6 GHz, so yes, you'll need something to downconvert,
like an LNB (and a bias tee).
As for cheap Block Upconverters (BUCs): I don't think there are cheap
(as in sub 200$) solutions, because there is not as much of a mass
market for satellite uplinks, at least here in central Europe. My best
guess would be looking for satellite internet access devices on ebay,
but I guess they won't come cheap; also, used maritime equipment could
be useful.
Obviously, you have to be *very* aware of regulatory problems if you're
working with power upconverters with unknown characteristics for TX.
Greetings,
Marcus
On 30.03.2014 20:33, hossein talaiee wrote:
> Can I use USRP for Rx/Tx in Ku band? Rx: 10.5 GHz and Tx : 14GHz ?
> I think I can use a universal LNB + T-Bias for power for RX but what can
> use for Tx?
> Is there any cheap UCB for 14GHz band?
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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Message: 6
Date: Mon, 31 Mar 2014 17:08:25 +0200
From: Martin Braun <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Stepped Frequency Radar
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 03/21/2014 02:38 PM, Haroon Muhammad wrote:
> Hi!
>
> Please advice if the WBX along with N-210 can be used to implement a
> coherent Stepped Frequency Radar which detects the phase difference at
> each transmitted frequency? Can any other daughterboard serve the purpose?
Haroon,
which bandwidths are you trying to achieve here? If you want to stay
within the available baseband bandwidth, there'll be no problems.
Martin
------------------------------
Message: 7
Date: Mon, 31 Mar 2014 17:40:40 +0200
From: Martin Braun <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Full bandwidth streaming from X300 to disk
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252
On 03/27/2014 07:09 PM, Mann, John P. - 1003 - MITLL wrote:
> I?m thinking of buying an X300, and am interested in recording full
> bandwidth data to hard disk. I realize that the data rates will be
> insanely high, so what would I need to accomplish this? I currently use
> Samsung 840pro solid state drives to record data from our N200s, and
> they handle 100 Mbytes/sec with no problem. But I?m guessing I may need
> to use a RAID of solid state drives to keep up with the X300? Any
> chance I could record 2 full bandwidth channels at once?
Hey John,
if you want to record 100 MHz at full resolution (16 bits), then your HD
will have to support a write speed of at least 400 MB/s (4 bytes per
sample!), or 800 MB/s if you're recording floats (I guess you don't want
that).
Experience has shown that SSDs aren't necessarily that much faster than
HDDs when it comes to sustained writing. If you have a benchmark to test
writing speed, it should exceed whatever you need (e.g. 400 MB/s) by a
large margin.
> Also ? I am a bit confused by the spec sheet. It claims a maximum ADC
> sample rate of 200 MHz, but then says it supports 120 MHz bandwidth.
> Doesn?t that violate Nyquist? How much instantaneous bandwidth can I
> actually get out of it?
Those number are actually unrelated. The ADC runs at 200 Msps (I + Q),
so according to Nyquist, it can sample a 200 MHz chunk of bandwidth.
The 120 MHz come from the analog preselection filters. Our
daughterboards ship with different types of analog filters, the widest
you can buy directly have the mentioned 120 MHz bandwidth.
In practice, you can't use the full Nyquist bandwidth (i.e. the 200 MHz)
anyway, because you want to avoid aliasing. So if you buy an X300 kit
w/o modifications, 120 MHz is what you'll get.
> Could I set the decimation to 2, and get 100 MHz complex baseband I/Q
> data streaming to disk? If so, what would the usable bandwidth be?
If you're using a 120 MHz d'board (e.g. CBX-120), then you can use
pretty much the entire 100 MHz, minus some space for the digital filter
flanks. So, if you had a signal that's exactly 100 MHz wide, this would
be problematic (again, aliasing etc.), but if you only "need" 90 or so,
you're good.
Martin
------------------------------
Message: 8
Date: Mon, 31 Mar 2014 17:57:27 +0200
From: Martin Braun <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] GPSDO and MIMO
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 03/30/2014 07:26 PM, Mike Jameson wrote:
> Hi Dan,
>
> The MIMO cable carries the 10MHz reference, 1PPS signal and network
> traffic. If you use the UHD source/sink blocks in GRC you can select the
> MIMO cable as the clock source for your second N200.
Also, since you're asking about MIMO: Two N210s connected via MIMO cable
behave pretty much like one device, only the phase might be offset. Make
sure you consider this for your MIMO application.
Martin
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End of USRP-users Digest, Vol 43, Issue 31
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