[hpsdr] Higher sampling speeds

[Bob McGwier]

The limiting factor on bandwidth is not the cpu in our computers,  it is the
sustained rate we can get from USB 2.0.  

The code in Mercury, QS1R, and USRP2 can all be enchanced to do MANY
channels in parallel with the use of polyphase filter banks.  I am doing
that code now to be deployed on the USRP2 spartan which with the GigE
interface, can support a wider bandwidth.  The code will be verilog so it
can be ported to all of thee machines.

Think of the PFB as many receivers running in a parallel with a huge savings
in computation being provided by clever signal processing.

CWSkimmer and its myriad channels of CW or one of the parallel PSK31 or WSJT
receivers is just a taste of what we will soon be able to do.

Bob


ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"And yes I said, yes I will Yes", Molly Bloom


-----Original Message-----
From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
On Behalf Of Phil Harman
Sent: Thursday, January 01, 2009 8:00 PM
To: hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] Higher sampling speeds

***** High Performance Software Defined Radio Discussion List *****


Alberto,

The current Mercury FPGA code only supports 48/96/192kHz sampling rates 
- but hey, it's only software :)

No it does not have to be PowerSDR - but that is where Bill, KD5TFD,  
our only volunteer is working at the moment.

73's Phil...VK6APH



Quoting Alberto I2PHD <i2phd at weaksignals.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Phil Harman wrote:
>>
>> Hi Alberto,
>>
>> Yes, there a lots of plans for many new and exciting Mercury 
>> features - plenty of plans but few volunteers to do the work!
>>
>> If you look at
>>
>> http://hpsdr.org/wiki/index.php?title=CYCLOPS
>>
>> you will see Mercury displaying 50MHz of spectrum.
>
>  Hi Phil,
>
>   does this mean that the current FPGA codes of Mercury and Ozy are
already
> capable of sampling rates higher than 192 kHz ? Or is that a special
version
> of the FPGA code ?
>
>> A port to SDRMAX should be possible - volunteers?  :)
>
> Must it absolutely be POWERSDR ?  {:-)
>
> 73  Alberto  I2PHD
>
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