[hpsdr] 8 receivers

[John Melton]

Bob McGwier made a comment at the TAPR/AMSAT banquet about how I was excited about the prospect of 8 receivers running on Mercury and he could easily get 100 using polyphase filters.  I keep meaning to ask him if he would be my mentor ;-)

-- John g0orx/n6lyt

On 6 Jul 2010, at 21:13, Steven Doyle wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> I can't take any credit for that, I think it was Phil  or Rick that mentioned in the Friday team speak.
> 
> I just found a rather nice matlab package for the experimenters
> 
> http://www.mathworks.com/matlabcentral/fileexchange/15813-near-perfect-reconstruction-polyphase-filterbank
> 
> For those of us who do not have access to Matlab as its a hugely expensive piece of software. I personally use Octave which is open source and is nearly 100% compatible with matlab.
> 
> http://www.gnu.org/software/octave/
> 
> 
> 73s
> 
> Steve
> G1YLB
> 
> --------------------------------------------------
> From: "Ken N9VV" <n9vv at wowway.com>
> Sent: Tuesday, July 06, 2010 8:58 PM
> To: "Steven Doyle" <steve_doyle at o2.co.uk>
> Subject: Re: 8 receivers
> 
>> Cheers Steve, well done. You are a *good* detective. I know that John G0ORX/N6LYT <john.d.melton at googlemail.com> and Bruce Walker W1BW <bruce at quidnet.com> will be *very* interested in anything that you find.
>> 
>> They have been struggling with 4 simultaneous receivers and wanted to get to 8. However they expressed frustration getting beyond 4 Rx.
>> 
>> Perhaps your info can help them - and subsequently ALL OF US :-) :-)
>> many thanks for delving into this IMPORTANT area,
>> 73 de Ken N9VV
>> http://24.192.100.58/rx0.html
>> or
>> http://24.192.100.58/rx1.html
>> 
>> 
>> On 7/6/2010 2:44 PM, Steven Doyle wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>> 
>>> If we got it implemented in verilog on Mercury we would not be limited
>>> to the 192K base band per receiver but could have different receivers
>>> each with different base bands. So we could then have for example a
>>> receiver for each of the amateur bands. Googling around I have
>>> discovered some verilog implementations and even some IP cores are
>>> already available.
>>> 
>>> Ah too many interesting projects around !
>>> 
>>> 73s
>>> 
>>> Steve
>>> G1YLB
>>> 
>>> --------------------------------------------------
>>> From: "Frank Brickle" <brickle at pobox.com>
>>> Sent: Tuesday, July 06, 2010 6:52 PM
>>> To: "Steve Doyle" <steve_doyle at o2.co.uk>
>>> Subject: Re: [hpsdr] Polyphase filters
>>> 
>>>> Polyphase filterbanks of this kind are at the heart of the new version
>>>> of DttSP currently in development.
>>>> 
>>>> 73
>>>> Frank
>>>> AB2KT
>>>> 
>>>> On Tue, Jul 6, 2010 at 9:18 AM, Steve Doyle <steve_doyle at o2.co.uk> wrote:
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>> 
>>>>> Hi,
>>>>> 
>>>>> This weeks teamspeak peaked my interest when when someone mentioned
>>>>> the potential of polyphase filters as the solution to multiple
>>>>> receivers, I think someone mentioned 100 separate receivers !
>>>>> 
>>>>> Anyway I came across the following tutorial, the math is beyond me
>>>>> but the matlab program doesn't look to bad.
>>>>> 
>>>>> Www.signumconcepts.com/download/paper035.pdf
>>>>> 
>>>>> Interesting stuff
>>>>> 
>>>>> 73s
>>>>> 
>>>>> Steve
>>>>> G1ylb
>>>>> 
>>>>> 
>>>>> Sent from my iPhone
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>>>> 
>>>> 
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