On Tue, Jun 27, 2006 at 01:25:51PM -0400, Chuck Swiger wrote:
> On Tue, 2006-06-27 at 11:18 -0400, Marcus Leech wrote:
>
> I'll try for 6MHz wide segments cut from 8MHz plots to smooth out
> the curve next time, rain permitting. ImageMagick make automating
> the cropping and montage creating from
Charles Swiger wrote:
Yes, and barely room for that. There's still lots of C-band dishes
out there free for the taking, so I've heard.
I'll try for 6MHz wide segments cut from 8MHz plots to smooth out
the curve next time, rain permitting. ImageMagick make automating
the cropping and montage cre
On Tue, 2006-06-27 at 11:18 -0400, Marcus Leech wrote:
> >
> There's an astronomically-important spectral line at
> 12.178Ghz--Methanol. Which will come out of your
> LNB at 1428Mhz. The M45 region of the sky produces Methanol masering
> outbursts on a regular basis.
> But you probably
On Tue, Jun 27, 2006 at 10:55:43AM -0400, Chuck Swiger wrote:
> On Mon, 2006-06-26 at 17:12 -0700, Matt Ettus wrote:
> > >doesn't it look like the USB 2.0 is a heavily constraining bottleneck?
> > >
> > >
> > Yes, USB2.0 is the bottleneck.
> >
> > >And, if I'm not wrong about this, will it be po
Charles Swiger wrote:
For what it's worth, here's an simple 1st attempt to make a montage
of 8MHz plots to show a wide band (240MHz of Galaxy 10R at 123W,
Ku vertical):
http://webpages.charter.net/cswiger/123w_3.jpg (1MB)
The LNB lo is 10750M, so where it says "968" the actual f is 11718MHz,
On Mon, 2006-06-26 at 17:12 -0700, Matt Ettus wrote:
> >doesn't it look like the USB 2.0 is a heavily constraining bottleneck?
> >
> >
> Yes, USB2.0 is the bottleneck.
>
> >And, if I'm not wrong about this, will it be possible in the future to
> >have a USRP <--> PC interface which doesn't limit
David Carr wrote:
All this RA talk makes me curious about what a typical RA IF setup
looks like.
Do RA samplers usually employ quadrature sampling (I and Q) or do they
sample
a "real" signal at twice the desired bandwidth? Also, if the big boys
use 1GHz sample rates, what do the little boys u
All this RA talk makes me curious about what a typical RA IF setup looks
like.
Do RA samplers usually employ quadrature sampling (I and Q) or do they
sample
a "real" signal at twice the desired bandwidth?
Also, if the big boys use 1GHz sample rates, what do the little boys
use? 10s or 100s of
>doesn't it look like the USB 2.0 is a heavily constraining bottleneck?>
>
Yes, USB2.0 is the bottleneck.
>And, if I'm not wrong about this, will it be possible in the future to>have a USRP <--> PC interface which doesn't limit us so much.>>
Other than 802.11, there aren't many applications that
Matt Ettus wrote:
Other than 802.11, there aren't many applications that require more
than 8 MHz of bandwidth. Radio astronomy is one, but you can use
fewer bits per sample with RA. It is not uncommon to use 1 or 2 bits
per sample, which would allow you to cover 128 and 64 MHz respectivel
doesn't it look like the USB 2.0 is a heavily constraining bottleneck?
Yes, USB2.0 is the bottleneck.
And, if I'm not wrong about this, will it be possible in the future to
have a USRP <--> PC interface which doesn't limit us so much.
Would something like a dedicated PCI LVDS card be a viable
doesn't it look like the USB 2.0 is a heavily constraining bottleneck?
Yes, USB2.0 is the bottleneck.
And, if I'm not wrong about this, will it be possible in the future to
have a USRP <--> PC interface which doesn't limit us so much.
Other than 802.11, there aren't many applications th
Hi everybody,
this is probably a silly question, but there's one thing i cannot fully
understand.
Considering that the 2 ADCs per channel on the USRP allow complex
samping at 64Msps, and therefore a 64MHz Spectral Bandwidth, and that my
inexpensive PC just needs 45% of CPU calculation power in ord
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